Spatial and temporal variation of uranium in a shallow weathered rock aquifer in southern India |
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Authors: | K BRINDHA L ELANGO R N NAIR |
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Institution: | (1) Department of Geology, Anna University, 600 025 Chennai, India;(2) Environmental Assessment Division, Bhabha Atomic Research Centre, 400 085 Mumbai, India; |
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Abstract: | Uranium occurs naturally in groundwater and surface water. The objective of this study is to understand the causes for the
occurrence of uranium and its spatio-temporal variation in groundwater in a part of Nalgonda district, Andhra Pradesh, south
India. Uranium deposits occur in the southeastern part of this area. Groundwater samples were collected from 44 wells every
two months from March 2008 to January 2009. The samples were analyzed for pH, ORP and uranium concentration. The uranium concentration
in groundwater varies from 0.2 ppb to a maximum of 68 ppb with a mean of 18.5 ppb. About 21.6% of the samples were above the
drinking water limit of 30 ppb set by USEPA. The uranium concentration varied with fluctuation in groundwater level, pH and
ORP. Uranium concentration in groundwater changes depending on lithology, degree of weathering and rainfall recharge. |
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