This study selected a lead-zinc smelter as the research object and tested the distribution and pollution of eight heavy metals,including Cd,Hg,As,Pb,Cr,Cu,Ni,and Zn,in the soil.Single factor index(Pi)evaluation,Nemero comprehensive pollution index(PN)evaluation,land accumulation index(Igeo)evaluation,and potential ecological risk(Ri)evaluation were used to evaluate the degree of soil pollution and ecological risk.The results showed that the average content of heavy metals in soil was higher than the background values of soil elements in China(Sichuan Province)and the maximum value is higher than the limit values of the"Soil Environmental Quality Agricultural Land Soil Pollution Risk Control Standard(Trial)"(GB 15618-2018)standards,and it belonged to high variability.The soil was more significantly affected by external interference.The average Pi value of soil heavy metals is Cd＞Zn＞Cr＞Pb＞As＞Cu＞Ni＞Hg,with the average Pi of Cd being heavily polluted.The maximum value of soil heavy metal PN reached 17.17,and 62.5％of the sampling points had soil at a severe pollution level.The main contributing factors to soil pollution were Cd,Zn,and Pb.The average Igeo of Cd is between severe and strong severe pollution levels,while the average Igeo of Hg is moderate pollution levels.The average Igeo of Zn,Pb,Cr,and As ranges from none to moderate pollution levels,and each element accumulates to varying degrees.The single potential ecological risk of soil Cd and Hg reaches an extremely strong level of risk.The range of Pi is 194.06-2 887.79,and the overall comprehensive potential ecological risk of soil is at a strong level of ecological risk,Cd is the main contributing factor to the comprehensive potential risk,followed by Hg,As,Pb,etc.The soil around the lead-zinc smelting plant is significantly affected by external interference,causing varying degrees of heavy metal pollution to the soil.
soil heavy metalspollution characteristicspollution assessmentsmelting plant
万方数据
维普
