Assessment of Heavy Metal Pollution in Soil and Main Crops of a Tungsten Mining Area in Gannan
A field investigation was conducted on metal pollution near a tungsten mining area and the accumulation of heavy metals in crops.Soil samples were collected from 24 sampling points around the tungsten mining area,and crop samples were collected from three main agricultural distribution points for comprehensive analysis of heavy metal content,in order to evaluate the local heavy metal pollution.The results showed that:(1)The content of Cd in the soil samples was 16.82 times higher than the background value in Jiangxi Province,and the content of W was 5.67 times higher than the background value.Multivariate statistical analysis shows that W-Cd-As-Pb-Zn may have similar sources,which reveals for the first time that tungsten mining may lead to the source of Zn in soil.(2)The concentrations of Pb,Cr,Cd,and as in the six vegetables studied exceeded the limit standards.Among the above-ground parts,Zn was the most abundant heavy metal,and the average concentrations of the heavy metal elements were as follows:Zn＞Pb＞Cu＞Cr＞W＞Cd＞As.Canola flowers,garlic,pea flowers,and oilseed rape showed strong transportation capacity for Cr.Garlic showed strong transportation capacity for multiple heavy metals and was more susceptible to heavy metal pollution.
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