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| 2. |
- 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
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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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| 3. |
- 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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| 5. |
- Battaleb-Looie, S., et al.
(författare)
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Fluoride in groundwater, dates and wheat : Estimated exposure dose in the population of Bushehr, Iran
- 2013
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Ingår i: Journal of Food Composition and Analysis. - : Elsevier BV. - 0889-1575 .- 1096-0481. ; 29:2, s. 94-99
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Tidskriftsartikel (refereegranskat)abstract
- The goal of this study was to estimate the daily fluoride intake for residents of Bushehr province in southern Iran by determining their exposure to fluoride through consumption of drinking water, dates and wheat. The fluoride concentration of drinking water in this region varies between 0.5 and 3.0mg/L, with an average of 1.6mg/L; and 44.4% of the drinking water exceed the guideline value of 1.5mg/L recommended by WHO. The average fluoride content of dates is 10.0mg/kg; whereas wheat roots and shoots contain an average of 30.0 and 19.0mgF-/kg, respectively. The estimated intake from drinking water is 0.12mg/kg/d for children (20kg body weight) and 0.05mg/kg/d for adults (70kg body weight). The total estimated fluoride intake (from drinking water and dates) for children is 0.17mg/kg/d. Thus, dates contribute an average 30% to the daily fluoride intake in the population. The maximum estimated fluoride intake (from dates and drinking water) for children and adults are 3.4 and 1.6 times higher, respectively, than the minimum risk level of 0.05mg/kg/d calculated by Agency for Toxic Substances and Disease Registry.
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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
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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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