Heavy Metal Pollution Status and Risk Assessment in Soil of a Certain Coal Mining Area
In order to explore the heavy metal pollution of the agricultural soil around the mining area caused by extensive mining activities in a coal mining area,Shanxi Province,and the adverse effects of the heavy metal content in agricultural objects on human beings after planting crops,the soil around the mining area was selected as the research object with the plum blossom sampling method,Six kinds of heavy metals such as Cu.Cr.Ni.Zn.Cd.Pb in soil and the content of heavy metals in Bok choy growing in farmland soil were measured by Inductively coupled plasma emission spectrometer.The results showed that the content of six heavy metals in the soil was 17.8 mg/kg,48.8 mg/kg,25.2 mg/kg,65.9 mg/kg,0.3 mg/kg,and 19.1 mg/kg,respectively.The single factor index and Nemero comprehensive pollution index methods were used to evaluate the degree of heavy metal pollution in the soil of this area,and the soil heavy metal content was analyzed.Using the background value of soil in Shanxi Province as a reference,using the single factor pollution index method,it was found that the soil in the study area is contaminated;The Nemero comprehensive pollution index shows that the soil in the study area has reached a moderate level of pollution.Through monitoring the content of heavy metals in various parts of Bok choy,the enrichment coefficient showed that the ability of each part to enrich heavy metals was root>stem>leaf.Therefore,effective governance measures should be taken to prevent heavy metal pollution from damaging human health on the surveyed land.
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