Hydrogeochemical characteristics of the aquifers with variable arsenic concentrations
Arsenic (As) concentrations in groundwater range between ＞0.1 and 476 μl-1, with localized high concentrations in abandoned meander/channel deposits. The groundwater flow lines tend to be deflected away from the high As aquifer. This indicates both low permeability and low recharge rates, as well as an abundance of fine-grained sediments associated with high As areas. These factors allow for high groundwater residence time for sediment-water interaction to occur, thus facilitating the release of As from meander/channel deposits. Borehole lithology analysis confirms our assumption, where finer-sediments are associated with the high As concentrations. Moreover, the presence of silt/clay intercalations within the sandy aquifer at the sites showing high As seems to influence As mobility.
B.Nath J.S.Jean D.Stüben D.Chatterjee S.B.Mallik
Department of Earth Sciences, National Cheng Kung University, Tainan, Taiwan R.O.C Institute of Mineralogy and Geochemistry, Karlsruhe University, Karlsruhe, Germany Department of Chemistry, Kalyani University, West Bengal, India Department of Geological Sciences, Jadavpur University, India
国际会议
第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)
昆明
英文
1097-1100
2007-07-31（万方平台首次上网日期，不代表论文的发表时间）