Heavy Metal Pollution Characteristics and Risk Assessment of Soil Surrounding A Steel Enterprise
To clarify the pollution situation and risks of soil surrounding the iron and steel enterprise,tak-ing a steel enterprise in Fujian province as an example,a systematic point distribution method was adopted,combined with factors such as atmospheric deposition range and terrain,with a total of 23 points distributed.A-mong them,5 points were distributed within 50 meters of the enterprise boundary(with a spatial distance of 50 m),15 points were distributed about 500 meters away from the enterprise boundary within the atmospheric dep-osition range outside the boundary(with a spatial distance of 500 m),and 3 control points were distributed a-bout 1000 m away from the enterprise boundary outside the atmospheric deposition range(with a spatial distance of 1 000 m)to determine the content of 8 heavy metals,including cadmium Cd,mercury Hg,arsenic As,lead Pb,chromium Cr,copper Cu,nickel Ni,and zinc Zn,in the soil.The single factor index method and Nemerow comprehensive index method were used to evaluate the soil environment.The results showed that the content of 8 heavy metals,including As,Cd,Cr,Cu,Hg,Ni,Pb,and Zn,at 50 and 500 m exceeded the background values.The evaluation results showed that the Mero comprehensive index at 50 and 500 m of the steel enterprise was 20.47 and 24.85,respectively,indicating heavy pollution.The single factor index of Cd and Zn was greater than 1,indicating that the soil around the steel enterprise was polluted.
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