1. College of Resource and Enviormental Engineering, Guizhou University, Guiyang 550025, China;
2. Guizhou Academy of Environmental Science and Designing, Guiyang 550081, China;
3. College of Agriculture, Guizhou University, Guiyang 550025, China
The concentration of Pb, Cd, Zn, Cu, As and Ni in soils and dominant vegetables were determined based on the soil and vegetable samples collected from a representative zinc-smelting region in Northwest of Guizhou province. Both single factor pollution index and comprehensive pollution index methods were used to assess the concentration of heavy metals in soils and vegetables, and their potential ecological risks and health risks to adults and adolescents were also analyzed by the potential ecological risk index (RI) and target hazard quotient (THQ) methods. The results showed that the soils in the zinc-smelting area were contaminated by heavy metals and Cd contributed the most to the integrated pollution index; high ecological risks were imposed by Cd and there were 2.04%, 14.3%, 35.7% and 48.0% of sample sites in each category, decided according to the potential ecological risk index, of low, medium, high and extremely high risk, respectively. Among vegetable samples, the potatoes were heavily polluted and kidney beans were moderately polluted. Moreover, the comprehensive health risk index analysis suggested that the eating of vegetables grown in sample areas could cause serious potential health risks for adults and adolescents.
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