Arsenic mobility and groundwater extraction in Bangladesh |
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Authors: | Harvey Charles F Swartz Christopher H Badruzzaman A B M Keon-Blute Nicole Yu Winston Ali M Ashraf Jay Jenny Beckie Roger Niedan Volker Brabander Daniel Oates Peter M Ashfaque Khandaker N Islam Shafiqul Hemond Harold F Ahmed M Feroze |
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Affiliation: | Ralph M. Parsons Laboratory, Department of Civil & Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 01239, USA. |
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Abstract: | High levels of arsenic in well water are causing widespread poisoning in Bangladesh. In a typical aquifer in southern Bangladesh, chemical data imply that arsenic mobilization is associated with recent inflow of carbon. High concentrations of radiocarbon-young methane indicate that young carbon has driven recent biogeochemical processes, and irrigation pumping is sufficient to have drawn water to the depth where dissolved arsenic is at a maximum. The results of field injection of molasses, nitrate, and low-arsenic water show that organic carbon or its degradation products may quickly mobilize arsenic, oxidants may lower arsenic concentrations, and sorption of arsenic is limited by saturation of aquifer materials. |
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