Influence of lead and zinc smelting waste on heavy metal content of surrounding soils under karst landscape
Taking a historical lead and zinc smelting site in Guizhou as the research object,we col-lected lead and zinc smelting slag as well as the surrounding soil,tested and analyzed the content of cadmium,mercury,arsenic,lead,chromium,copper,nickel and zinc of each sample,and evalua-ted the environmental quality of the soil around the river downstream of the lead and zinc smelting slag by using the Single Factor Pollution Index(SFPI)method and Nemerow Comprehensive Pollu-tion Index(NCPI)method to research the effect of the lead and zinc smelting site on the surrounding soil's heavy metal content.The results found that the cadmium,arsenic and lead content of the slag samples are high,exceeding the risk control value of agricultural land soil pollution in the"Soil En-vironmental Quality Agricultural Land Soil Pollution Risk Control Standards(Trial)"(GB 15618-2018),while copper,nickel and zinc exceeding the screening value of the risk of soil pollution in agricultural land.For the surrounding soil samples,cadmium,copper,nickel content are high,all ex-ceeding the agricultural land soil pollution risk screening value.As the distance from the slag becomes larger,the heavy metal content of the soil first rises and then falls.The left bank of the river is generally more affected by smelting slag than the right bank.From the point of view of single-factor pollution index of soil heavy metals,there is serious pollution of soil cadmium,and the degree of pollution is in the fol-lowing order:cadmium＞copper＞nickel＞chromium＞zinc.According to the comprehensive pollution index,heavy pollution soil area accounts for 58%,medium pollution area accounts for 42%.In summary,the historical left lead and zinc smelting slag shows certain degree of risk to the surrounding soil environment.
lead and zinc smelting waste residueheavy metalssoilenvironmental impact
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