| 1. |
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| 2. |
- Hossain, Mohammad, et al.
(författare)
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Strategic approach for up-scaling safe water access considering hydrogeological suitability and social mapping in Matlab, southeastern Bangladesh
- 2013
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Konferensbidrag (refereegranskat)abstract
- In recent years, there has been a significant progress in understanding the source and mobilization process, sediment-water interactions, and distributions of arsenic in groundwater environment in Bangladesh. However, the impacts of arsenic mitigation are still very limited. A social survey conducted during 2009-2011 in 96 villages in Matlab revealed that only 18% of total tubewells provide As-safe water. The safe water access also varied between 0 and 90 percent in the region due to lack of knowledge about the local geology and unplanned tubewell development. SASMIT, an initiative of KTH-International Groundwater Arsenic Research Group has developed a method for safe tubewell installation considering hydrogeological suitability, safe water access and other relevant social and demographic information into account.Piezometers installed at 15 locations over an area of 410 km2, using local boring techniques allowed to delineate the hydrostratigraphy, characterize the aquifers in terms of sediment characteristics, water chemistry and hydraulic head distribution, which ultimately led to the identification of the suitable aquifers for tapping safe water. The piezometer locations with safe drinking water quality were then targeted for safe well installation based on the determination of safe buffer distances in a cluster of a few villages (mouzas). Social mapping of all the villages within the mauzas were done using GIS to evaluate the availability of safe water options for a cluster of households (bari). For safe well installations, priority was given to regions with safe water access, greater number of beneficiaries especially in poor households, and easy access to the site from a cluster of households. Through this approach, it was thus possible to make 95% of the newly installed wells As-safe thus scaled up the safe water access upto 40% in some mauzas. Thus the as a strategy to improve safe water access, the SASMIT study recommends investigating the hydrogeological suitability through installation of few piezometers with a minimum effort and based on the results the implementation plan can be made using GIS based social mappings for relatively uniform distribution and to maximize the safe water access.
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| 3. |
- Hossain, M., et al.
(författare)
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Potentiality of intermediate depth aquifer as a source of arsenic and manganese safe tubewells in Bangladesh
- 2012
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Ingår i: Understanding the Geological and Medical Interface of Arsenic, As 2012 - 4th International Congress: Arsenic in the Environment. - : Taylor & Francis Group. - 9780415637633 ; , s. 71-73
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Konferensbidrag (refereegranskat)abstract
- Shallow tubewells excepting those installed in red/off-white sediments are mostly contaminated with high arsenic. Social survey conducted in 96 villages of Matlab, a worse-affected area of Bangladesh, reveals that only 18% of tubewells provide As-safe water. In such a condition, high Manganese in many wells is found to be an additional problem. Based on monitoring in depth-specific piezometers, drinking water wells were installed in intermediate depth aquifer around 120 m. Ninety percent of the wells installed in light grey medium sand, had arsenic concentrations below the Bangladesh standard of 50 ÎŒg/L and manganese was within the previous WHO guideline (0.4 mg/L). Availability of similar sand over this depth range could be targeted by local drillers to tap safe water at a reasonable cost. Replication trials and periodical monitoring are emphasized for validation and sustainability.
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| 4. |
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| 5. |
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| 6. |
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| 7. |
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| 8. |
- Onabolu, B., et al.
(författare)
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Integrating policy, system strengthening, research and harmonized services delivery for scaling up drinking water safety in Bangladesh
- 2018
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Ingår i: Environmental Arsenic in a ChangingWorld - 7th International Congress and Exhibition Arsenic in the Environment, 2018. - London : CRC Press/Balkema. - 9781138486096 ; , s. 535-537
-
Konferensbidrag (refereegranskat)abstract
- The WASH Sector Development Plan (2011–2025) recognizes the absence of harmonized approaches as the root challenge to scaling up drinking water safety in Bangladesh. UNICEF is supporting the Government of Bangladesh (GoB) through the Department of Public Health Engineering (DPHE) and Policy Support Branch to re-engineer its approach to drinking water safety by integrating policy, systems strengthening & sustainable services delivery at national and sub-national levels. Some of the key contributions to the sector include the implementation of the UNICEF-DPHE Arsenic Safe Union model with the declaration of 106 Arsenic Safe Villages, reduction in arsenic contamination rates of new tubewells, a system for preventing elite capture of water points, and the adoption of the ASU model in a $240 million arsenic mitigation drinking water project using domestic resources. Relatedly, a Policy Support Branch has been established, the sector coordination mechanisms revised, WASH bottleneck analysis is ongoing & the National Implementation Plan on Arsenic has been reviewed: Next steps include the professionalisation of drilling by local drillers through a partnership with KTH, Sweden, the GoB and UNICEF.
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| 9. |
- Bhattacharya, Prosun, et al.
(författare)
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Groundwater arsenic pollution : A conceptual framework for sustainable mitigation strategy
- 2014
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Ingår i: One Century of the Discovery of Arsenicosis in Latin America (1914-2014). - : CRC Press. - 9781138001411 ; , s. 881-885
-
Konferensbidrag (refereegranskat)abstract
- Tubewells installed by local drillers, provide access of drinking water in rural Bangladesh. Significant proportion of these wells contains arsenic (As) above the WHO guideline and the Bangladesh Drinking Water Standard. Various attempts for mitigation at household and community scale have resulted in limited success, but through the local driller's initiatives, the tubewells are the source of priority drinking water supply. We have developed a concept of Sustainable Arsenic Mitigation (SASMIT) to identify and target the safe aquifers through detailed hydrogeological studies for scientific validation of the water quality with respect to the color of the shallow sediments as perceived by local drillers. Together with water quality monitoring, we have also targeted the Intermediate Depth Aquifers (IDA) for providing As-safe and low manganese (Mn) water. SASMIT intervention logic also considered the relevant socio-economic scenario, such as household distribution, poverty issues and available safe water access for prioritizing safe well installation.
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| 10. |
- Hossain, Mohammed Mojahidul, et al.
(författare)
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Enhancing the capacity of local drillers for installing arsenic-safe drinking water wells—experience from Matlab, Bangladesh
- 2016
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Ingår i: Arsenic Research and Global Sustainability - Proceedings of the 6th International Congress on Arsenic in the Environment, AS 2016. - : CRC Press. ; , s. 630-631
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Konferensbidrag (refereegranskat)abstract
- Nearly 90% of the estimated 10 million tubewells in Bangladesh are installed privately by local drillers for rural drinking water supplies in Bangladesh. The awareness of local drillers on elevated Arsenic (As) concentrations in tubewell water at shallow depths have made them change their practice of installation of tubewells. Using the visual color attributes of the shallow sediments (<100 m) and content of dissolved iron, generally associated with high As concentrations, the local drillers presently install community tubewells at depths targeting red/brownish or off-white sediments. This study recognizes the local tubewell drillers as important stakeholder in the business of tubewell installation. A Sediment Color Tool has been developed to enhance the local driller’s capacity to identify the As-safe aquifers that would bring significant change to reduce As exposure and scale-up safe water access in rural Bangladesh.
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| 11. |
- Hossain, Mohammed, et al.
(författare)
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Sediment color tool for targeting arsenic-safe aquifers for the installation of shallow drinking water tubewells
- 2014
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Ingår i: Science of the Total Environment. - : Elsevier BV. - 0048-9697 .- 1879-1026. ; 493, s. 615-625
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Tidskriftsartikel (refereegranskat)abstract
- In rural Bangladesh, drinking water supply mostly comes from shallow hand tubewells installed manually by the local drillers, the main driving force in tubewell installation. This study was aimed at developing a sediment color tool on the basis of local driller's perception of sediment color, arsenic (As) concentration of tubewell waters and respective color of aquifer sediments. Laboratory analysis of 521 groundwater samples collected from 144 wells during 2009 to 2011 indicate that As concentrations in groundwater were generally higher in the black colored sediments with an average of 239 mu g/L. All 39 wells producing water from red sediments provide safe water following the Bangladesh drinking water standard for As (50 mu g/L) where mean and median values were less than the WHO guideline value of 10 mu g/L. Observations for off-white sediments were also quite similar. White sediments were rare and seemed to be less important for well installations at shallow depths. A total of 2240 sediment samples were collected at intervals of 1.5 m down to depths of 100 m at 15 locations spread over a 410 km(2) area in Matlab, Bangladesh and compared with the Munsell Color Chart with the purpose of direct comparison of sediment color in a consistent manner. All samples were assigned with Munsell Color and Munsell Code, which eventually led to identify 60 color shade varieties which were narrowed to four colors (black, white, off-white and red) as perceived and used by the local drillers. During the process of color grouping, participatory approach was considered taking the opinions of local drillers, technicians, and geologists into account. This simplified sediment color tool can be used conveniently during shallow tubewell installation and thus shows the potential for educating local drillers to target safe aquifers on the basis of the color characteristics of the sediments.
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| 12. |
- Kibria, M. G., et al.
(författare)
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Hydrogeochemistry and microbial geochemistry on different depth aquifer sediments from Matlab, Bangladesh
- 2014
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Ingår i: One Century of the Discovery of Arsenicosis in Latin America (1914-2014). - : CRC Press. - 9781138001411 ; , s. 101-103
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Konferensbidrag (refereegranskat)abstract
- Arsenic (As) poses the greatest hazard towards drinking water quality in Bangladesh. Tubewell drinking water is one of the main sources for household based water options in rural Bangladesh. Our study area is in Matlab Upazila, in Bangladesh. The overall objective of this research and the SASMIT project is to develop a community based initiative for sustainable As mitigation by developing a sediment color based tool for the local drillers prioritizing on the hydrogeological and biogeochemical investigations. For this purpose we analyzed different depth colored sediments and water for find out the sustainable low Arsenic contaminated aquifer.
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| 13. |
- Sharma, S., et al.
(författare)
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ASMITAS – A novel application for digitalizing the SASMIT Sediment Color Tool to identify arsenic safe aquifers for drinking water supplies
- 2018
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Ingår i: Environmental Arsenic in a ChangingWorld - 7th International Congress and Exhibition Arsenic in the Environment, 2018. - London : CRC Press/Balkema. - 9781138486096 ; , s. 629-632
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Konferensbidrag (refereegranskat)abstract
- Arsenic (As) contamination in groundwater is an environmental health hazard in several part of the world and a large number of population has affected due to its toxic nature. In Bangladesh, a comprehensive research was accomplished which established a very strong correlation between the aquifer sediments and As concentration in the groundwater. The local drillers practice this knowledge over a time. Based on an action research conducted by the SASMIT project team from KTH Royal Institute of Technology, Sweden in collaboration with the local drillers in Bangladesh and a novel handheld sediment color tool was produced to facilitate the local drillers to target safe aquifers for safe tube-well installation. This study was made to advance this tool to be developed as a fully artificial intelligence (AI) based digital ASMITAS (Arsenic Mitigation at Source) tool based on spectral scanning of the sediment color. An HSI camera enables us to capture continuous spectral channels from a given object ranging from IR bands, through VR to UV ranges and hence scores comprehensive imaging output over traditional RGB data based color cameras, thus increase the perception of the color with more accuracy and precision. This new tool can be scalable to cover large geographical area and hence can be very useful tool for local drillers and other stakeholders for smart decision making for installation of safe tube-wells for mitigating As at source level.
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| 14. |
- Bhattacharya, Prosun, 1962-, et al.
(författare)
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Hydrogeochemical contrasts across the multi-level aquifers of Bengal basin in Matlab, Bangladesh : Implications for arsenic free and low-manganese drinking water sources
- 2016
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Ingår i: Arsenic Research and Global Sustainability - Proceedings of the 6th International Congress on Arsenic in the Environment, AS 2016. - : CRC Press/Balkema. ; , s. 45-46
-
Konferensbidrag (refereegranskat)abstract
- Targeting shallow, intermediate-deep and deep aquifers, piezometers nests were installed at 15 locations in the Matlab region, an As hotspot in southeastern Bangladesh. Groundwater levels and water quality were monitored for over a three years period. Stable isotopic composition was used to identify the hydrogeological characteristics of different aquifers, hydraulic connectivity between the contaminated and safe aquifers. Within the shallow depth (up to 100m), two aquifers (Aquifer-1 and Aquifer-2) were identified, and groundwater from Aquifer-1 indicated consistently high As concentration was found to be As-enriched (median As levels upto 714 μg/L). Considerable variability in As concentrations were observed in Aquifer-2 wells (6–30 μg/L) comprising relatively oxidized or less reduced red and off-white sands. The intermediate-deep and deep aquifers were found to contain very low As concentration and these aquifers are hydraulically separated from the shallow aquifers. Groundwater depth and elevation and stable isotope signatures also reflect that intermediate-deep and deep aquifers, in most places belong to the same hydrostratigraphic unit (Aquifer-3).
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| 15. |
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| 16. |
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| 17. |
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| 18. |
- Claudio, P., et al.
(författare)
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Geochemical modelling application for a 1-d arsenic reactive transport study in alluvial aquifers, Matlab Upazila, Bangladesh
- 2009
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Ingår i: Rendiconti Online della Società Geologica Italiana. - 2035-8008. ; 6, s. 364-365
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Tidskriftsartikel (refereegranskat)abstract
- Mechanistic modelling was used to investigate the hydrochemical evolution along a vertical column, should cross-contamination occur. 1-D reactive transport was carried out to assess sorption effects on aqueous/solid arsenic distribution in Matlab Upazila, Bangladesh. Thermodynamic relationships between aqueous ions and aquifer materials have been investigated: comparison between redox couples shows electrochemical disequilibrium; sorption mainly occurs on weak and strong Hydrous Ferric-Oxides, described by the Surface Complexation Mode. The basis for reactive transport calculations is given by a static model, that evaluates the competing ions net effect: they reduce by ca. 50% arsenic bounding. Desorption process alone can give unacceptable As (aq) concentrations, starting from only a few mg/kg As (sorb). Redox zonation was the starting point for the model conception, which allowed calculating the contamination evolution in an oxidising As-low aquifer. Groundwater analysis is worked out for a 20 cells column of aquifer material, whose top represents the upper reducing aquifer, the bottom the oxidising aquifer; contamination takes place through an As-rich solution percolating into the column. Results are a function of the flow velocity, that needs to be carefully defined before further modelling.
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| 19. |
- Jakariya, Md., et al.
(författare)
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Searching for sustainable arsenic mitigation strategy in Bangladesh : experience from two upazilas
- 2007
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Ingår i: International Journal of Environment and Pollution. - 0957-4352 .- 1741-5101. ; 31:3-4, s. 415-430
-
Tidskriftsartikel (refereegranskat)abstract
- Arsenic concentrations of tubewell water that exceed the Bangladesh Drinking Water Standard pose a serious health problem for millions of people in Bangladesh. Groundwater is the source of drinking water for 98% of the population. The main object of the study was to review the status of the provided options, which were distributed during 1999-2001 in two upazilas. It was observed that acceptability of the distributed options was not encouraging; less than 2% of the provided options were found to be in operation. However, two new approaches emerged from people's initiatives, which are making rapid and positive contributions to safe water coverage.
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| 20. |
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| 21. |
- Svensson, M., et al.
(författare)
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Arsenic in groundwater in northern Sweden
- 2010
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Ingår i: Arsenic in Geosphere and Human Diseases, As 2010 - 3rd International Congress. ; , s. 46-47
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Konferensbidrag (refereegranskat)
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| 22. |
- von Brömssen, Martin, et al.
(författare)
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Hydrogeological investigation for assessment of the sustainability of low-arsenic aquifers as a safe drinking water source in regions with high-arsenic groundwater in Matlab, southeastern Bangladesh
- 2014
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Ingår i: Journal of Hydrology. - : Elsevier BV. - 0022-1694 .- 1879-2707. ; 518:C, s. 373-392
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Tidskriftsartikel (refereegranskat)abstract
- Exploitation of groundwater from shallow, high prolific Holocene sedimentary aquifers has been a main element for achieving safe drinking water and food security in Bangladesh. However, the presence of elevated levels of geogenic arsenic (As) in these aquifers has undermined this success. Except for targeting safe aquifers through installations of tubewells to greater depth, no mitigation option has been successfully implemented on a larger scale. The objective of this study has been to characterise the hydrostratigraphy, groundwater flow patterns, the hydraulic properties to assess the sustainability of the low-arsenic aquifers at Matlab, in south-eastern Bangladesh, one of the worst arsenic-affected areas of Bangladesh. Combining groundwater modelling with monitoring hydraulic heads in multi-level piezometer tests, 14C-dating of groundwater, conventional hydraulic testing and assessment of groundwater abstraction rate proved to be a useful strategy. A model comprising of three aquifers covering the top 250 m of the model domain showed to best fit the evaluation criteria for calibration. Matlab is a recharge area, even though it is adjacent to the great Meghna River. Irrigation wells are placed in clusters and account for most of the groundwater abstraction. Even though the hydraulic heads are affected locally by seasonal pumping, the aquifer system is fully recharged during and after the monsoon period. Groundwater simulations demonstrated the presence of deep regional and horizontal flow systems with recharge areas in the eastern, hilly part of Bangladesh and shallow small local flow systems driven by local topography. Based on modelling and 14C groundwater data, it can be concluded that the natural local flow systems reach a depth of 30 m b.g.l. in the study area. A downwardvertical gradient of roughly 0.01 down to 200 m b.g.l. was observed and reproduced bycalibrated models. The vertical gradient is mainly the result of the aquifer system and-properties rather than abstraction rate, which is too limited at depth to make an imprint. Although irrigation wells substantially change local flow pattern, targeting low-As aquifers seems to be a suitable mitigation option for providing people with safe drinkingwater. However, installing new irrigation- or high capacity production wells at the same depth is strongly discouraged as these substantially change the groundwater flow pattern. The results from the present study and other similar studies can further contribute to develop a rational management and mitigation policy for the future use of the groundwater resources for drinking water supplies.
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| 23. |
- von Brömssen, Mattias, et al.
(författare)
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Targeting low-arsenic aquifers in Matlab Upazila, Southeastern Bangladesh
- 2007
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Ingår i: Science of the Total Environment. - : Elsevier BV. - 0048-9697 .- 1879-1026. ; 375:2-3, s. 121-132
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Tidskriftsartikel (refereegranskat)abstract
- Groundwater with high concentration of geogenic arsenic (As) occurs extensively in the Holocene alluvial aquifers of Bangladesh. Local drillers in Matlab Upazilla are constructing deeper tubewells than in the recent past, primarily because of low concentrations of dissolved Fe and As. Locally a thick layer of black to grey sediments overlies an oxidised unit of yellowish-grey to reddish-brown sediments. The correlation between the colour of both units and the groundwater redox conditions was investigated to provide an easy tool for targeting low-arsenic groundwater. Based on the sediment colour at the screen depths described by local drillers, 40 domestic shallow tubewells were selected for water sampling. Four colours were used to describe the sediments: black, white, off-white (buff) and red. Generally, the groundwater was anoxic and the As concentrations ranged from less than 5.2 to 355 mu g/L. Water derived from the black sediment is characterized by relatively higher concentrations of dissolved NH4+, DOC, Fe, P, As and by low Mn and SO42- concentrations. The off-white and red sediments had high concentration of Mn and low NH4+, DOC, Fe, P and As concentrations. The water abstracted from the black sediments indicated the most reducing environment, followed by white, off-white and red respectively. Three boreholes verified the driller's perception of the subsurface lithologic conditions. Discrepancies between the driller's and the research team description of the sediment colours were insignificant. This study shows that sediment colour is a reliable indicator of high and low-As concentrations and can be used by local drillers to target low-arsenic groundwater.
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| 24. |
- Bauer, Simon, et al.
(författare)
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A Culturally Relevant Education? Analysing “Swedish Values”in Civic Orientation for Newly Arrived Migrants
- 2024
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Ingår i: Educare - Vetenskapliga skrifter. - 1653-1868. ; :1, s. 112-144
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Tidskriftsartikel (refereegranskat)abstract
- This article contributes to ongoing discussions on education for migrants as a form of integration policy and practice. It does so by investigating whether the initiative Civic Orientation for Newly Arrived Migrants in Sweden constitutes an example of culturally relevant education. Drawing on a mixed-method and multi-level analysis, we hone in on “values” as a discursive construction in order to see how particular principles are linked to Swedishness. Specifically, we show how values are discursively constructed on multiple levels through 1) a qualitative analysis of policy documents instrumental to the implementation of civic orientation; 2) a quantitative corpus-assisted critical discourse analysis of media articles; 3) individual interviews with 14 persons involved in organizing the civic orientation courses; and 4) ethnographic classroom observations from six such courses. Our results show how, on the one hand, Sweden is constructed as the most developed country in the world in terms of values and, on the other hand, migrants are portrayed as antithetical to such an ideal imagination. Furthermore, we show how a specific set of values – human rights and democracy – changes meaning from being universal to becoming particularized and nationalized as “Swedish”.
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| 25. |
- Bauer, Simon, et al.
(författare)
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Constructing the “Good Citizen”: Discourses of Social Inclusion in Swedish Civic Orientation
- 2023
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Ingår i: Social Inclusion. - 2183-2803. ; 11:4, s. 121-131
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Tidskriftsartikel (refereegranskat)abstract
- Sweden has long been described as a beacon of multiculturalism and generous access to citizenship, with integration policies that seek to offer free and equal access to the welfare state. In this article, we use the policy of Civic Orientation for Newly Arrived Migrants as a case with which to understand how migrants’ inclusion is discursively articulated and constructed by the different constituencies involved in interpreting the policy and organising and teaching the course. We do this by employing Foucault’s closely interrelated concepts of technology of self, political technology of individuals, and governmentality. With the help of critical discourse analysis, we illustrate how migrants’ inclusion is framed around an opposition between an idealised “good citizen” and a “target population” (Schneider & Ingram, 1993). In our analysis, we draw on individual interviews with 14 people involved in organising civic orientation and on classroom observations of six civic orientation courses. Firstly, we show how migrants are constructed as unknowing and in need of being fostered by the state. Secondly, we illustrate how social inclusion is presented as being dependent upon labour market participation, both in terms of finding work and in terms of behaving correctly in the workplace. Lastly, we show how migrant women are constructed as being problematically chained to the home and therefore needing to subject themselves to a specific political technology of self to be included.
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| 26. |
- Bauer, Simon, et al.
(författare)
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Gender equality in the name of the state: state feminism or femonationalism in civic orientation for newly arrived migrants in Sweden?
- 2023
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Ingår i: Critical Discourse Studies. - 1740-5904 .- 1740-5912.
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Tidskriftsartikel (refereegranskat)abstract
- This article contributes to ongoing discussions in the social sciences about how to interpret the incorporation of gender equality into integration policies – is it a form of state feminism or femonationalism? Drawing upon intersectionality, we analyse how gender equality is presented, discussed and negotiated in relation to ethnicity and nationality in Sweden. Methodologically, we employ a bifocal lens that combines (1) a quantitative investigation of representations of civic orientation programmes in Swedish policy documents and mainstream media, and (2) a qualitative analysis of ethnographic data collected in six civic orientation courses – three in English and three in Arabic – in three large municipalities. Such a two-pronged approach, which connects policy and media discourses with interactions in civic orientation classes, offers a granular picture of the complex and often ambivalent intersections of ethnicity and gender in relation to migration in Sweden. Ultimately, the co-optation of feminist values brings with it the risk of warping feminism into a trait of national/ethnic distinctiveness. Crucially, femonationalism is not the prerogative of far-right parties but is already becoming institutionalised, informing both mainstream media and educational practices in a feminist state like Sweden.
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| 27. |
- Bauer, Simon, et al.
(författare)
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Locating Sweden in Time and Space: National Chronotopes in Civic Orientation for Adult Migrants
- 2023
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Ingår i: Nordic Journal of Migration Research. - : Helsinki University Press. - 1799-649X. ; 13:1, s. 1-17
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this article is to use courses in civic orientation for newly arrived adult migrants in Sweden as the empirical entry point from which to investigate whether, and if so, how, civic values are tied to the Swedish nation through specific discourses and narratives. With the help of a framework that brings together theorisations of the discursive construction of the nation with the notions of the chronotope and ‘social narratives’, the article demonstrates how narratives within civic orientation are characterised by specific spatio-temporal moves that discursively construct Sweden as a nation-state. Such national chronotopes are not innocuous but are part of a rhetoric of nationalism that constructs a linear and comprehensive story of prosperity and superiority, not least vis-à-vis some other geographical areas in the world. As such, the analysis seeks to contribute to the burgeoning scholarship on civic orientation programmes by offering further empirical evidence of the shapes such programmes take, and how civic values become nationalised. With the help of the notion of the chronotope, the article also seeks to add some fresh perspectives to scholarship on nationalism and othering by showing mundane spatio-temporal moves in the production of a ‘national imaginary’ (Calhoun 2017).
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| 28. |
- Bhattacharya, Prosun, et al.
(författare)
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Groundwater chemistry and arsenic mobilization in the Holocene flood plains in south-central Bangladesh
- 2009
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Ingår i: Environmental Geochemistry and Health. - : Springer Science and Business Media LLC. - 0269-4042 .- 1573-2983. ; 31, s. 23-43
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Tidskriftsartikel (refereegranskat)abstract
- A comparative study of arsenic enrichment in the Bengal Delta (BD) was carried Out in three alluvial aquifers in south-central Bangladesh. Investigated sites included Sonargaon in Narayanganj, Chandina in Comilla and Sirajdikhan in Munshiganj districts. At all sites samples from different depths were collected, and water chemistry and redox status vs. depth trends were determined. The concentrations of DOC and HCO3- were highest at Sirajdikhan site, while at the Sonargaon and Chandina sites the concentrations were lower. On the contrary, the NH4+ concentration was high at the Chandina site as compared to the other sites. There was a good match between dissolved As and Fe at the Sirajdikhan and Sonargaon sites, but not at the Chandina site. The dissolved aqueous concentration of Mn was low at the Chandina site, which suggested that the Mn(IV) redox buffering step was missing. Speciation modeling indicated a possibility of siderite precipitation at all sites, but precipitation of rhodochrosite only at the Sonargaon and Sirajdikhan sites. At the Sirajdikhan site, the log P-CO2 values were very high (-1.37), which revealed the production Of CO2 in redox processes. Principal component analysis (PCA) indicated an impact of sea water and redox status of different samples. These results suggest that the dissolved As is de-coupled from dissolved Mn because when released, As is re-adsorbed onto the Fe(Ill) minerals in solid phase, as well as from dissolved Fe when precipitation of Fe(II) minerals controls the aqueous concentrations of Fe. In addition, several other concurrent redox processes may exert kinetic constraints depending on refractory characteristics of Fe(II) minerals.
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| 29. |
- Bhattacharya, Prosun, et al.
(författare)
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Temporal and seasonal variability of arsenic in drinking water wells in Matlab, southeastern Bangladesh : A preliminary evaluation on the basis of a 4 year study
- 2011
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Ingår i: Journal of Environmental Science and Health. Part A. - : Informa UK Limited. - 1093-4529 .- 1532-4117. ; 46:11, s. 1177-1184
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Tidskriftsartikel (refereegranskat)abstract
- Temporal and seasonal variability of As concentrations in groundwater were evaluated in As-affected areas of Matlab, southeastern Bangladesh. Groundwater samples from 61 randomly selected tubewells were analyzed for As concentrations over a period of three years and four months (from July 2002 to November 2005) and monitored seasonally (three times a year). The mean As concentrations in the sampled tubewells decreased from 153 to 123 mu g/L during July 2002 to November 2005. Such changes were pronounced in tubewells with As concentration >50 mu g/L than those with As concentrations <50 mu g/L. Similarly, individual wells revealed temporal variability, for example some wells indicated a decreasing trend, while some other wells indicated stable As concentration during the monitoring period. The mean As concentrations were significantly higher in Matlab North compared with Matlab South. The spatial variations in the mean As concentrations may be due to the differences in local geological conditions and groundwater flow patterns. The variations in mean As concentrations were also observed in shallow (<40 m) and deep (>40 m) wells. However, to adequately evaluate temporal and seasonal variability of As concentration, it is imperative to monitor As concentrations in tubewells over a longer period of time. Such long-term monitoring will provide important information for the assessment of human health risk and the sustainability of safe drinking water supplies.
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| 30. |
- Hasan, Md. Aziz, 1960-, et al.
(författare)
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Arsenic in shallow groundwater of Bangladesh : investigations from three different physiographic settings
- 2007
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Ingår i: Hydrogeology Journal. - : Springer Science and Business Media LLC. - 1431-2174 .- 1435-0157. ; 15:8, s. 1507-1522
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Tidskriftsartikel (refereegranskat)abstract
- Occurrences of arsenic (As) in the Bengal Basin of Bangladesh show close relationships with depositional environments and sediment textures. Hydrochemical data from three sites with varying physiography and sedimentation history show marked variations in redox status and dissolved As concentrations. Arsenic concentration in groundwater of the Ganges Flood Plain (GFP) is characteristically low, where high Mn concentrations indicate redox buffering by reduction of Mn(IV)-oxyhydroxides. Low DOC, HCO3-, NH4+ and high NO3- and So(4)(2-) concentrations reflect an elevated redox status in GFP aquifers. In contrast, As concentration in the Ganges Delta Plain (GDP) is very high along with high Fe and low Mn. In the Meghna Flood Plain (MFP), moderate to high As and Fe concentrations and low Mn are detected. Degradation of organic matter probably drives redox reactions in the aquifers, particularly in MFP and GDP, thereby mobilising dissolved As. Speciation calculations indicate supersaturation with respect to siderite and vivianite in the groundwater samples at MFP and GDP, but groundwater in the GFP wells is generally supersaturated with respect to rhodochrosite. Values of log P-CO2 at MFP and GDP sites are generally higher than at the GFP site. This is consistent with Mn(IV)-redox buffering suggested at the GFP site compared to Fe(III)-redox buffering at MFP and GDP sites.
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| 31. |
- Hasan, M. Aziz, et al.
(författare)
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Geological controls on groundwater chemistry and arsenic mobilization : Hydrogeochemical study along an E-W transect in the Meghna basin, Bangladesh
- 2009
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Ingår i: Journal of Hydrology. - : Elsevier BV. - 0022-1694 .- 1879-2707. ; 378:1-2, s. 105-118
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Tidskriftsartikel (refereegranskat)abstract
- Hydrogeochemical investigations along an E-W transect in the middle Meghna basin show groundwater chemistry and redox condition vary considerably with the change in geology. Groundwater in the Holocene shallow (< 150 m bgl) alluvial aquifer in western part of the transect is affected by high arsenic concentration (As > 10 mu g/l) and salinity. On the other hand, groundwater from the Pliocene Dupi Tila sandy aquifer in the eastern part is fresh and low in As (< 10 mu g/l). The Holocene shallow aquifers are high in dissolved As. HCO3-, Fe and dissolved organic carbon (DOC), but generally low in SO2- and NO3-. High HCO3- concentrations (250-716 mg/l) together with high DOC concentrations (1.4-21.7 mg/l) in these aquifers reflect active sources of degradable natural organic matter that drives the biogeochemical process. There is generally de-coupling of As from other redox-sensitive elements. In contrast, the Pliocene aquifers are low in As, HCO3- and DOC. Molar ratio of HCO3-/H4SiO4 suggests that silicate weathering is dominant in the deeper Holocene aquifers and in the Pliocene aquifers. Molar ratios of Cl-/HCO3- and Na+/Cl- suggest mixing of relict seawater with the fresh water as the origin of groundwater salinity. Speciation calculations show that saturation indices for siderite and rhodochrosite vary significantly between the Holocene and Pliocene aquifers. Stable isotopes (delta H-2 and delta O-18) in groundwater indicate rapid infiltration without significant effects of evaporation. The isotopic data also indicates groundwater recharge from monsoonal precipitation with some impact of altitude effect at the base of the Tripura Hills in the east. The results of the study clearly indicate geological control (i.e. change in lithofacies) on groundwater chemistry and distribution of redox-sensitive elements such as As along the transect.
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| 32. |
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| 33. |
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| 34. |
- Milani, Tommaso M., 1973, et al.
(författare)
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Citizenship as status, habitus and acts: Language requirements and civic orientation in Sweden
- 2021
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Ingår i: Citizenship Studies. - : Informa UK Limited. - 1362-1025 .- 1469-3593. ; 25:6, s. 756-772
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Tidskriftsartikel (refereegranskat)abstract
- This article employs the notions of citizenship as status, habitus and acts as a framework through which to capture how sovereign power, disciplinary power and biopower intersect in the context of Sweden’s current management of migration. Through an analysis of policy and media debates, the article first illustrates how citizenship as status and sovereign power in Sweden have undergone a shift from actively endorsing multilingualism and cultural dialogue to requiring migrants to demonstrate knowledge of a particular language, Swedish, and what is constructed as a singular national culture and its values. The article then homes in on a particular Arabic-language course in civic orientation for newly arrived adult migrants in a large urban area. We illustrate how disciplinary power and biopower work by socializing a group of migrants into a specific habitus of Swedish values and norms. We also unveil the acts of resistance they perform in response.
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| 35. |
- Milani, Tommaso M., et al.
(författare)
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Civic orientation for adult migrants in Sweden : A multimodal critical discourse analysis of Swedish values and norms
- 2022
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Ingår i: Fjortonde nationella konferensen isvenska med didaktisk inriktning. - Malmö : Malmö universitet. - 9789178772841 - 9789178772858 ; , s. 57-77
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Konferensbidrag (refereegranskat)abstract
- Drawing upon the analytical techniques of multimodal critical discourse analysis, this article investigates the book About Sweden, an educational materia lemployed in courses on civic orientation for newly arrived migrants. The analysisis informed by the following research questions: (1) What are represented as typically Swedish values and norms in the textbook? (2) How are such norms and values portrayed through written language and visual images? Visually the book relies on specific representations of Swedish nature without people. We argue that such pictures of the Swedish landscape are not ideologically neutral but carry connotations that are historically linked to forms of Swedish nationalism. Moreover, we interpret the lack of people in line with Berggren and Trägårdh (2006) notion of statist individualism (statsindividualism), an ideology according to which a strong interventionist welfare-state is not necessarily incompatible with the maximisation of individual freedom. Our textual analysis illustrates the textual tensions between, on the one hand, the choice of specific norms and values as Swedish, and, on the other hand, aversion towards overt national identity labels. Finally, we illustrate how Swedish values and norms in the textbook are just one link in a longer intertextual chain that connects the book to other policy documents as well as Swedish politicians’ public statements in the context of current debates about migration in Sweden.
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| 36. |
- Milani, Tommaso M., 1973, et al.
(författare)
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Civic orientation for adult migrants in Sweden – A multimodal critical discourse analysis of Swedish values and norms in the textbook About Sweden
- 2022
-
Ingår i: Fjortonde nationella konferensen i svenska med didaktisk inriktning : Didaktiska perspektiv på språk och litteratur i en globaliserad värld, Malmö 18–19 november 2020 / [ed] Pia Nygård Larsson, Cecilia Olsson Jers, Magnus Persson. - Malmö : Malmö universitet. - 1651-9132. - 9789178772841
-
Konferensbidrag (refereegranskat)abstract
- Drawing upon the analytical techniques of multimodal critical discourse analysis, this article investigates the book About Sweden, an educational material employed in courses on civic orientation for newly arrived migrants. The analysis is informed by the following research questions: (1) What are represented as typically Swedish values and norms in the textbook? (2) How are such norms and values portrayed through written language and visual images? Visually the book relies on specific representations of Swedish nature without people. We argue that such pictures of the Swedish landscape are not ideologically neutral but carry connotations that are historically linked to forms of Swedish nationalism. Moreover, we interpret the lack of people in line with Berggren and Trägårdh (2006) notion of statist individualism (statsindividualism), an ideology according to which a strong interventionist welfare-state is not necessarily incompatible with the maximisation of individual freedom. Our textual analysis illustrates the textual tensions between, on the one hand, the choice of specific norms and values as Swedish, and, on the other hand, aversion towards overt national identity labels. Finally, we illustrate how Swedish values and norms in the textbook are just one link in a longer intertextual chain that connects the book to other policy documents as well as Swedish politicians’ public statements in the context of current debates about migration in Sweden.
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| 37. |
- Milani, Tommaso M., 1973, et al.
(författare)
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Participation on whose terms? Applied linguistics, politics and social justice
- 2023
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Ingår i: AFinLA Yearbook. - 2343-2608. ; 80, s. 286-299
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this position paper is to engage with the focus of this yearbook on language and participation by revisiting some of the arguments advanced by the North American political philosopher Nancy Fraser, who theorized (1) the structural components that enable and/or constrain participation, and (2) the ways in which we can transform the status quo with a view to achieving a more just society. The paper begins by outlining Fraser’s main ideas; it then moves on to illustrate how this theoretical framework may help us shed light on the dilemmas and/or pitfalls of well-meaning initiatives that seek to enhance adult migrants’ participation. The empirical focus is on courses in civic orientation (samhällsorientering) for newly arrived adult migrants in Sweden. The paper ends with some reflections about the importance of a politically engaged applied linguistics.
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| 38. |
- Mukherjee, A., et al.
(författare)
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Delineating sustainable low-arsenic drinking water sources in South Asia
- 2016
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Ingår i: Arsenic Research and Global Sustainability - Proceedings of the 6th International Congress on Arsenic in the Environment, AS 2016. - : CRC Press/Balkema. - 9781138029415 ; , s. 628-629
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Konferensbidrag (refereegranskat)abstract
- Access to safe and sustainable drinking water is a basic human. In present times, when much of the world is reeling through severe groundwater availability stress, large parts of South Asia that hosts the aquifers of the three of the largest global river systems are bountiful with groundwater. However, much of this groundwater is enriched with carcinogenic arsenic. The present study aims to rapidly delineating sustainable safe drinking water sources in regionally arsenic-unsafe groundwater areas of Bangladesh and West Bengal. The study validates the correlation between aquifer sediment colours obtained from local drillers and quantified groundwater chemical composition, characterize aqueous and solid phase geochemistry and dynamics of As mobility and to assess the risk for cross-contamination of As between aquifers in study areas. The optimistic outcome of the study provides an unique opportunity for the local drillers in rural communities to target As-safe aquifers for well installations in Bengal basin.
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| 39. |
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| 40. |
- von Brömssen, Kerstin, 1952, et al.
(författare)
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“Swedes’ relations to their government are based on trust.” Banal Nationalism in Civic Orientation Courses for Newly Arrived Adult Migrants in Sweden
- 2022
-
Ingår i: Futures of Education, Culture and Nature - Learning to Become. - : Det Kgl. Bibliotek/Royal Danish Library. - 2794-2899. ; 1:1, s. 71-88
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Tidskriftsartikel (refereegranskat)abstract
- Civic orientation has become one of the dominant immigrant integration pol-icies in western Europe, with the aim of transmitting knowledge, norms, and values, thereby furthering “integration” into the new country. However, there is a not much re-search regarding how the educational content is communicated and negotiated in civic orientation courses in practice. This article aims to bring more empirically based knowledge in this field. The case study discussed in this article explores one specific mod-ule, entitled “nature and environment”, in civic orientation courses for newly arrived adults in Sweden. This is done through participatory observations in the courses, both in classrooms in real life and on the internet and exploring in detail the negotiations be-tween the civic orientation communicators and the course participants. The analyses show how a real “success story” of Sweden andits citizens is constructed through an overall discourse of Swedes high awareness of the environment and nature, not least through comparisons between geographical spaces in the world. The analyses also re-veal antagonistic voices about the content, although these are not particularly strong. We suggest that there is an urgent need to critically reflect on the aim, content, and teaching practices of civic orientation courses for newly arrived migrants, as these more seem to contribute to the Swedish nation’s reproduction of “banal nationalism”
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| 41. |
- von Brömssen, Mattias, et al.
(författare)
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Geochemical characterisation of shallow aquifer sediments of Matlab Upazila, Southeastern Bangladesh - Implications for targeting low-As aquifers
- 2008
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Ingår i: Journal of Contaminant Hydrology. - : Elsevier BV. - 0169-7722 .- 1873-6009. ; 99:1-4, s. 137-149
-
Tidskriftsartikel (refereegranskat)abstract
- High arsenic (As) concentrations in groundwater pose a serious threat to the health of millions of people in Bangladesh. Reductive dissolution of Fe(Ill)-oxyhydroxides and release of its adsorbed As is considered to be the principal mechanism responsible for mobilisation ofAs. The distribution ofAs is extremely heterogeneous both laterally and vertically. Groundwater abstracted from oxidised reddish sediments, in contrast to greyish reducing sediments, contains significantly lower amount of dissolved arsenic and can be a source of safe water. In order to study the sustainability of that mitigation option, this study describes the lithofacies and genesis of the sediments within 60 m depth and establishes a relationship between aqueous and solid phase geochemistry. Oxalate extractable Fe and Mn contents are higher in the reduced unit than in the oxidised unit, where Fe and Mn are present in more crystalline mineral phases. Equilibrium modelling of saturation indices suggest that the concentrations of dissolved Fe, Mn and PO43--tot in groundwater is influenced by 4 secondary mineral phases in addition to redox processes. Simulating As-[I] adsorption on hydroferric oxides using the Diffuse Layer Model and analytical data gave realistic concentrations of dissolved and adsorbed As-[I] for the reducing aquifer and we speculate that the presence of high PO43--tot in combination with reductive dissolution results in the high-As groundwater. The study confirms high mobility of As in reducing aquifers with typically dark colour of sediments found in previous studies and thus validates the approach for location of wells used by local drillers based on sediment colour. A more systematic and standardised colour description and similar studies at more locations are necessary for wider application of the approach.
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| 42. |
- Westin, Elin M., et al.
(författare)
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Laser welding of a lean duplex stainless steel
- 2007
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Ingår i: 26th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2007. - 9780912035888 ; , s. 335-344
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Konferensbidrag (refereegranskat)abstract
- Nd:YAG laser welding and laser gas tungsten arc (GTA) hybrid welding of the lean duplex stainless steel LDX 2101® (EN 1.4162, UNS S32101) were performed with and without filler wire and nitrogen additions to the shielding gas. The high energy density associated with laser welding of duplex stainless steels can affect the mechanical strength and corrosion resistance negatively. The high solidification rates and cooling rates characteristic of laser welding may cause ferritization and chromium nitride precipitation. However, due to the balanced composition of LDX 2101, the austenite reformation in the weld metal and the heat affected zone (HAZ) was satisfactory as confirmed by tensile test results, corrosion performance in terms of critical pitting temperature (CPT) and hardness measurements. Transmission electron microscopy (TEM) was conducted on simulated HAZs to study the effect of cooling rate on precipitate formation. Furthermore, Laser-GTA hybrid welding of the galvanized carbon steel Dogal® DP 600 onto LDX 2101 in lap joints was successful without porosity or liquid metal embrittlement (LME), and with sufficient tensile strength.
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