期刊
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
卷 38, 期 2, 页码 497-509出版社
SPRINGER
DOI: 10.1007/s10653-015-9735-7
关键词
Uranium; Hard-rock aquifer; U-speciation; Lithology
类别
资金
- University Grants Commission (UGC), India [F: 39-143/2010]
Uranium is a radioactive element normally present in hexavalent form as U(VI) in solution and elevated levels in drinking water cause health hazards. Representative groundwater samples were collected from different litho-units in this region and were analyzed for total U and major and minor ions. Results indicate that the highest U concentration (113 A mu g l(-1)) was found in granitic terrains of this region and about 10 % of the samples exceed the permissible limit for drinking water. Among different species of U in aqueous media, carbonate complexes [UO2(CO3) (2) (2-) ] are found to be dominant. Groundwater with higher U has higher pCO(2) values, indicating weathering by bicarbonate ions resulting in preferential mobilization of U in groundwater. The major minerals uraninite and coffinite were found to be supersaturated and are likely to control the distribution of U in the study area. Nature of U in groundwater, the effects of lithology on hydrochemistry and factors controlling its distribution in hard rock aquifers of Madurai district are highlighted in this paper.
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