1. Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China;
2. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China
Concentration of twelve metals, Hg, Mn, Fe, Al, Zn, Ni, As, Pb, Cr, Cd, Co and Cu from thirty samples collected from groundwater around iron mine in Hongyang, Liangan, Tingle and Kongjia villages in Chongzuo city were measured and analyzed to investigate their distribution characteristics and the human health risks. The distribution characteristics of these elements were analyzed using multivariate statistical analysis method and the health risks caused by metals were assessed using human health risk assessment model. The average concentrations of Zn and Fe ((250.32, 103.96μg/L) were higher than others. Concentrations of Hg, Mn, Fe, Al and Zn exceeded the Quality Standards for Groundwater (GB/T 14848-2017). The highest concentrations of Fe, Mn and Al were mainly located in Hongyang and Tingle, the highest concentrations of Zn and Hg were mainly located in Hongyang and Liangan. Multivariate statistical analysis indicated that Fe, Mn, Al, Pb, As and Co mainly originated from iron mining, while Cu, Zn, Cr and Ni were mainly related to the lead-zinc mine and regional geological background. Hg mainly originated from contaminated sugar and paper mills' contamination and Cd mainly originated from natural sources. The results of health risk assessment indicated that the total risks of metals in Liangan is the highest, which were 8.82×10-5a-1.Children had greater health risks than adults. The health risks of metals through drinking pathway were 2~3 orders of magnitude higher than the values caused by dermal contact pathway. Carcinogenic risks caused by Cr were higher than the maximum allowance levels (5.0×10-5a-1). The non-carcinogenic risk levels of the metals were 10-14~10-9a-1, which were 4~9 orders of magnitude lower than the maximum allowance.
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