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- Kpeglo, D. O., et al.
(author)
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Assessment of natural radioactivity levels and associated radiological hazard in scale and sludge from Jubilee oilfield of Ghana
- 2019
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In: International Journal of Low Radiation. - 1477-6545. ; 11:2, s. 143-157
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Journal article (peer-reviewed)abstract
- Knowledge of accurate radio-isotopic signatures and chemical constituents is essential in assessing potential radiological hazards to the public and workers from exposure to NORM waste. For that reason, scale and sludge samples from Ghanaian oilfields were assessed using alpha spectrometry, gamma spectrometry, radon monitoring and scanning electron microscope techniques. Activity concentration of 238U, 232Th-series and 40K radionuclides for NORM residues have been evaluated. Fourteen trace elements were also identified and semi-qualitatively quantified. The obtained results clearly reflect that scale and sludge may present radiological risk for workers, public and environment. Copyright © 2019 Inderscience Enterprises Ltd.
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| 2. |
- Kpeglo, D. O., et al.
(author)
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Radiochemical characterization of produced water from two production offshore oilfields in Ghana
- 2016
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In: Journal of Environmental Radioactivity. - : Elsevier BV. - 0265-931X. ; 152, s. 35-45
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Journal article (peer-reviewed)abstract
- Produced water from two Ghanaian offshore production oilfields has been characterized using alpha spectrometry after radiochemical separation, non-destructive gamma spectrometry and ICP-MS and other complimentary analytical tools. The measured concentrations of main NORM components were in the range of 6.2-22.3 Bq.L-1, 6.4-35.5 Bq.L-1, and 0.7-7.0 Bq.L-4 (f)or Ra-226, Ra-228 and Ra-224 respectively. A good correlation between several physico-chemical parameters and radium isotopes was observed in each production oilfield. The radium concentrations obtained in this study for produced water from the two oilfields of Ghana are of radiological importance and hence there may be the need to put in place measures for future contamination concerns due to their bioavailability in the media and bioaccumulation characteristics. The results will assist in critical decision making for future set up of appropriate national guidelines for the management of NORM waste from the emerging oil and gas industry in Ghana. (C) 2015 Elsevier Ltd. All rights reserved.
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| 3. |
- Mandujano-Garcia, C. D., et al.
(author)
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Radiological impact of natural radionuclides from soils of Salamanca, Mexico
- 2016
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In: Applied Radiation and Isotopes. - : Elsevier BV. - 0969-8043. ; 117, s. 91-95
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Journal article (peer-reviewed)abstract
- Salamanca is the centre of a large industrial complex associated with the production and refining of oil-derived products in the state of Guanajuato, Mexico. The city also hosts a large chemical industry, and in past years a major fertilizer industry. All of them followed NORM (naturally occurring radioactive materials) industrial activities, where either raw materials or residues enriched in natural radionuclides are handled or generated, which can have an environmental radiological impact on their environmental compartments (e.g. soils and aquatic systems). In this study, activity concentrations of radionuclides from the U-238 and Th-232 natural series present in superficial urban soils surrounding an industrial complex in Salamanca, Mexico, have been determined to analyse the possible environmental radiological impact of some of the industrial activities. The alpha-particle and gamma-ray spectrometry is used for the radiometric characterization. The results revealed the presence of 10-42, 11-51 and 178-811 Bq/kg of (238)u, Th-232 and K-40, respectively, without any clear anthropogenic increment in relation to the values normally found in unaffected soils. Thus, the radioactive impact of the industrial activities on the surrounding soils can be evaluated as very low, representing no radiological risk for the health of the population. (C) 2016 Elsevier Ltd. All rights reserved.
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| 4. |
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| 5. |
- Mantero, Juan, et al.
(author)
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Elementary characterization of environmental samples from pit lakes in Sweden
- 2016
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In: EXRS2016 European Conference on X-ray Spectrometry, Gothenburg, June 19-24, 2016.
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Conference paper (other academic/artistic)abstract
- The effect of mining activities in a country as Sweden (the major metal mining country in the European Union) implies enormous quantities of generated mining wastes. Historically, more than 2700 mines gather around 30000 sites that have been minor mines and quarries (according to the database of Geological Survey of Sweden, SGU). In 1950, there were around 100 active mines while nowadays no more than 15 active mines still remains with ongoing extractions. Many of these sites had opencast mines. During exploitation by open-pit mining, the water table is suppressed to avoid the flooding of active mines. However, when mining activity ceases, the water table recovers its original position, flooding the open pits and giving rise to mine pit lakes. The environmental problem arise because these waters can be affected by Acidic Mine Drainage (AMD), having high/very high concentration of heavy metals in solution. Apart from the impact to the ecosystem, these places are nearby populated areas and most of them are usually used for recreation purposes (swimming, fishing, diving) by inhabitant of these former mining areas. In this work, a survey on 30 different abandoned pit lakes was performed. Superficial waters and sediments from the shoreline were sampled to check the levels of metals (major elements and traces) at these sites. Water samples were doubly analysed: via TXRF with a S2 PICOFOX (equipped with Mo tube) and via ICP-MS. The aim was to compare and cross-check both measurement systems pointing out the advantages/disadvantages between them. Also physico-chemical parameters as pH, T, ORP, DO or salinity were measured in water samples and will be correlated with the chemical behaviour of some elements. The elementary characterization of sediments was carried out by WDXRF with an AXIOS system. The concentration levels of Fe, Mn, Cu, Zn, S, Mg, Ca, Cr among others metals will be shown. In Waters, levels of Fe ranges from 0.01 to 235 mg/l, for S (0.9 to 8600 mg/l), Mn (0.02 to 8400 ppm), Cu (0.9 to 6400 ppm) or Zn (35 to 32000 ppm) as some examples. Regarding sediments, Fe ranges from 0.18 to 55 %, S (0.01 to 8.5%), Mn (0.01 to 0.85%), Cu (6 to 2125 ppm) or Zn (65 to 2000 ppm) with traces in Ba (35 to 7100 ppm) or Pb (1.3 to 2800 ppm) as more relevant elements. The main conclusion is that during this survey, some places with high levels of heavy metals were identified both in water and sediment samples.
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| 9. |
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| 10. |
- Mantero, Juan, et al.
(author)
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NORM and heavy metal levels in pit lakes in Sweden
- 2018
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In: Environmental radioactivity –experience from Japan and Sweden. JSPS Alumni Club in Sweden (SAC) Activity Seminar . 15-16 November, Gothenburg, Sweden.
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Conference paper (other academic/artistic)
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