Pollution Status and Health Risk Assessment of Soil and Agricultural Products Around Lead-zinc Mining and Dressing
In order to understand the impact of lead-zinc mining and processing activities on the soil ecological environment of downstream ag-ricultural land,taking the downstream agricultural land of a lead-zinc mining enterprise in Guizhou as the research object,and the soil and ag-ricultural products samples in A and B areas of the study area were collected by random distribution method,and the contents of eight heavy metals were determined.The pollution characteristics and risk assessment of eight heavy metals(Pb,Cd,Ni,As,Hg,Cu,Cr,Zn)in the soil of agricultural land in the study area were analyzed by single factor pollution index(Pi)method and Nemero comprehensive pollution in-dex(PN).High risk quotient(HQ)and high risk index(HI)were used to evaluate the health risks of heavy metals in rice and corn to adults and children.The results showed that the soil of agricultural land in this area was polluted by different degrees of heavy metals,Cd was heavily polluted,As and Zn were slightly polluted.The comprehensive pollution index of soil heavy metals in area A was greater than that in area B,and Cd contributed the most to the comprehensive pollution index.The heavy metals in agricultural products in this area were mainly Cd con-tent exceeding the standard,and the Cd exceeding rate of rice was greater than that of corn;there was no significant correlation between the to-tal amount of heavy metals in rice and corn and the total amount of heavy metals in soil in the study area.Intake of rice and corn in this area,single heavy metals Cd and As had a great risk to human health.Rice had a great possibility of health impact on the human body,and the im-pact on children was significantly greater than that on adults.Corn did not have a health impact on the human body.
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