Characteristics,sources and evaluation of soil heavy metals in east margin of Dongting Lake,Xinkai Town
From April to September 2021,851 soil samples were collected from Xinkai Town in east margin of Dongting Lake.As,Pb,Cu,Zn,Ni,Cd,Hg and Cr were analyzed.The pollution characteristics and sources of the 8 heavy metals were explored.Ecological risk were evaluated.Risk areas were divided using"Soil environmental quality-risk control standard for soil contamination of agricultural land"(GB 15618-2018).Results showed that the average mass concentrations of As,Pb,Cu,Cr,Hg,Ni,Cd and Zn in soil were 13.56,34.51,25.91,74.86,0.09,23.46,0.26 and 74.95 mg/kg,respectively.According to the source analysis for 8 heavy metals by positive matrix factor method,it was found that atmospheric sedimentation source mainly contributed to Hg,metal smelting emission source mainly contributed to Cd,agricultural pollution activity source mainly contributed to Pb,Zn and Cu,and natural source mainly contributed to As,Cr and Ni.Comprehensive potential ecological risk of 8 heavy metals was mainly composed of Hg and Cd.The soil environmental quality and geochemical comprehensive evaluation divided Xinkai Town into 3 kinds of risk areas,namely risk-free area(109.00 km2,accounted for 77.75％),risk controllable area(29.49 km2,accounted for 21.03％),and high risk area(1.71 km2,accounted for 1.22％).
万方数据
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