Ground water geochemistry of Ballia district, Uttar Pradesh, India and mechanism of arsenic release.

摘要: Threat to human health worldwide due the natural contamination of arsenic in ground waters has led extensive studies on factors controlling distribution and conditions leading mobilization different contaminated areas. Another aspect crisis, especially South Asia, is degree spatial variability water concentrations. Thus it becomes necessary study source processes involved into under such conditions. An area namely, Ballia district UP was chosen for this study. A set 56 samples were collected from India Mark II hand pumps (30-33 m depth) thrice a year namely pre-monsoon (April '07), monsoon (July '06) winter seasons (December '06). Nine also deep bore well (66-75 m) difference geochemistry with shallow pumps. Various quality parameters like As(III), As(V), sulfate, nitrate, phosphate, bicarbonate, ammonia, determined. Arsenic concentrations ranged 0 468 microg L(-1) depths 30-33 m. In deeper wells m), 12 20 L(-1). Most contained both As(III) As(V) concentration generally equal/higher than As(V). Not much variation observed when sampled summer, seasons. Correlation among various revealed that reductive dissolution FeOOH most probable mechanism release arsenic.