山西省太谷县农田土壤重金属污染特征及评价

为调查太谷县农田土壤重金属污染状况和来源，测定了太谷县20个土壤样品As、Cd、Cu、Hg、Pb、Zn6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As、Cd、Cu、Hg、Pb、Zn含量分别为8．50士1．28、0．072±0．005、21.87士5．46、0．156±0．111、30．98±9．65、72．64±48．40mg·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为重度累积。土壤中Pb、Zn、Cu部分来源于交通运输、钢铁7台炼和农业生产，而Hg污染来源可能与灌溉有关，其余元素主要为自然来源。

Pollution Characteristics and Assessment of Heavy Metal in soil of Taigu Shanxi Province

Twenty surface samples of farmland soils collected from Taigu, Shanxi Province were monitored and analyzed with cumulative index, index of geoaccumulation and multivariate statistical techniques to determine the concentrations and origins of 6 heavy metals （As, Cd, Cu, Hg, Pb, Zn） . The results indicated that the concentrations of As, Cd, Cu, Hg, Pb and Zn in soils were 8.50±1.28, 0. 072±0. 005, 21.87±5.46, 0. 156±0. 111, 30.98±9.65 and 48.40 ±72.64 mg . kg-1 , respectively. The contamination degrees of 6 heavy metals in 20 sites were between non-and-mod- erate-pollution level in the whole, but the mean concentrations of Hg were greater when comparing those data to the soil background contents of Shanxi Province. Pb, Zn and Cu in the samples were partially from traffic sources, steel smelting activities and agricultural practices, but Hg partly originated from irrigation and other elements mainly origi nated from a natural source.