Heavy Metal Enrichment Characteristics and Health Risk Assessment of Crops in Typical Abandoned Lead-zinc Mining Areas

In this experiment, an abandoned lead-zinc mine site was selected as the experimental research area after being changed into agricultural land. Nine soil samples and six crops samples were collected in the study area to analyze the enrichment and transfer characteristics of 8 heavy metals(Cd, As, Pb, Cu, Ni, Cr, Zn) in the soil-crops system,and to evaluate the health risks. The results showed that lead, zinc, copper, arsenic and cadmium in soil were heavily accumulated and seriously polluted, mercury was moderately accumulated, nickel was slightly accumulated, and chromium was not significantly accumulated, but mercury, nickel and chromium were not contaminated. The crops in this study were all heavy metal avoidance plants. The content of chromium and arsenic in rapeseed was the highest, the content of copper, zinc and mercury in spinach was the highest, and the content of cadmium in radish was the highest.Cu in radish, Chinese cabbage, carrot and onion and Cr in spinach did not exceed the reference dose. The results showed that Cu, Cr, Cd, Hg and Zn had potential harm to human health, while As and Pb had chronic toxicity.