Environmental Health Risk Assessment of Underground Water in Mining Area of Nandan County

Abstract

Guangxi Nandan county is a typical karst geological area, groundwater is rich, rich Tibetan non-ferrous metals. In order to study the risk of groundwater pollution on human health in mining area of Nandan County, base on the investigation and monitoring, The results of groundwater environment risk assessment of mine area of Nandan County show that water environmental health risk of No.5 belong to the minimum level, No.1, No. 2, No.3 and No.7 of four monitoring points is low risk,No.4 and No.6 for medium risk, No.8 as high risk.The health risk average value caused by toxic substances to individual person per year is 4.76×10-5a-1, which is less than the maximum acceptable level5×10-5a-1recommended by ICRP. The groundwater environmental health risks, mainly comes from chemical carcinogens arsenic (As), accounted for the average health risk (Rt) 99.998%,non carcinogenic health risk accounted for only 0.002%, almost negligible, therefore,stricter governing of chemical carcinogens is an effective way to reduce the health risk of groundwater pollution in mining area of Nandan County.