山西省灵石县农田土壤重金属含量及来源调查

为调查灵石县农田土壤重金属污染状况和来源,测定了灵石县20个土壤样品Hg,Cd,Pb,As,Cr,Cu,Zn共7种重金属含量,并采用累积性指数、地累积指数、相关分析及主成分分析法进行分析。结果表明,20个土壤样点的Hg,Cd,Pb,As,Cr,Cu,Zn含量分别为(0.116±0.099),(0.072±0.007),(25.26±4.64),(7.08±2.90),(63.88±15.31),(23.20±3.46),(60.82±13.98)mg/kg;20个样点土壤重金属整体处于无—中度污染水平,但与山西省土壤背景值相比,Hg为中度累积。土壤中Hg主要来源于工业排放,而Pb,Cr则主要来源于工业和交通运输业,其余元素主要为自然来源。

Source and Concentration of Heavy Metal in Farmland Soil of Lingshi County in Shanxi Province

20 soil samples in farmland collected from Lingshi County in Shanxi Province were monitored for contents of 7 heavy metals Hg,Cd,Pb,As,Cr,Cn,Zn and analyzed by cumulative index,geo-accumulation index,correlation analysis,and PCA,in order to investigate their concentrations and origins.The results indicate that the concentrations of Hg,Cd,Pb,As,Cr,Cu and Zn in soils are 0.116±0.099,0.072±0.007,25.26±4.64,7.08±2.90,63.88±15.31,23.20±3.46,60.82±13.98mg/kg,respectively.The degree of contamination of heavy metals in 20 sites is in non-middle level in whole,but compared to the soil background value in Shanxi Province,the concentrations of Hg is in middle level.Hg originates from industrial discharge.Pb and Cr originate mainly from industrial and traffic sources.However,other elements mainly originate from natural source.