Journal
WATER RESOURCES RESEARCH
Volume 37, Issue 1, Pages 109-117Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2000WR900270
Keywords
-
Categories
Ask authors/readers for more resources
In the deltaic plain of the Ganges-Meghna-Brahmaputra Rivers, arsenic concentrations in groundwater commonly exceed regulatory limits (>50 mug L(-1)) because FeOOH is microbially reduced and releases its sorbed load of arsenic to groundwater. Neither pyrite oxidation nor competitive exchange with fertilizer phosphate contribute to arsenic pollution. The most intense reduction and so severest pollution is driven by microbial degradation of buried deposits of peat. Concentrations of ammonium up to 23 mg L(-1) come from microbial fermentation of buried peat and organic waste in latrines. Concentrations of phosphorus of up to 5 mg L(-)1 come from the release of sorbed phosphorus when FeOOH is reductively dissolved and from degradation of peat and organic waste from latrines. Calcium and barium in groundwater come from dissolution of detrital land possibly pedogenic) carbonate, while magnesium is supplied by both carbonate dissolution and weathering of mica. The (87)Sr/(86)Sr values of dissolved strontium define a two-component mixing trend between monsoonal rainfall (0.711 +/- 0.001) and detrital carbonate (<0.735).
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available