Heavy Metal Contamination of Surface Water and Groundwater in and Around Gejiu Tin Mine, South - west China

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Abstract
Heavy metal contamination due to mining activity is a global major concern because of its potential health risks to local inhabitants. The heavy metal contamination of surface water and ground water by mining activities in Gejiu tin-polymetallic mining area, South - west China, was studied. Surface water and ground water were sampled and analyzed using AAS for Cr 6+ , Cd, As, Hg, Cu, Pb, Zn, Se, Fe and Mn. Analysis of HCO 3 – , Cl – , SO 4 2 – , F – and NO 3 – in water samples was also undertaken by ion chromatography. It was shown that none of water samples exceeded the guideline of Cr 6+ , Se and Hg, while the contamination degree of heavy metals was Mn > Fe > Cd > Zn > Pb > As > Cu, all of which were serious contamination except mild contamination for Cu. The ground waters were polluted much worse than surface water.