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arsenic contamination in parts of yamuna sub-basin, west bengal.arsenic rarely occurs in free state and is generally found in combination with sulphur, oxygen and iron. in the environment, arsenic occurs as a result of several inputs that contain this element in organic and inorganic forms. arsenic is present in coal, lead, zinc, gold and copper ores in the form of several minerals viz. arsenopyrite (feass), orpiment (as2s3), realgar (ass), arsenolite (as2o3) and lollingite (feas2). the commonly existing species in groundwater are in two forms viz. arsenite ...200315527018
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