某再生铅工业园周边土壤重金属的空间分布及来源分析

基于表层土壤重金属的实测含量,运用多元统计和地统计相结合的方法,对某再生铅工业园周边土壤重金属的分布情况和来源进行分析。结果表明,再生铅工业园周边土壤中Pb、Cd、As、Cr、Cu、Ni、Zn的几何平均含量分别为124.05、0.394、21.18、82.72、24.23、35.47、62.04 mg/kg。其中Pb、Cd、As分别是背景值的4.96、2.90、1.84倍,其余重金属元素含量与土壤背景值相当。重金属Pb、Cd在临近工业园区域含量较大,以工业园为中心呈岛状空间分布,且在工业园东部呈扩散趋势;As在周边农田中具有一定的累积量。来源分析表明,土壤中Pb、Cd主要受工业园生产活动的影响,而As则可能受到农业生产活动的影响。

Spatial Distributions and Sources of Heavy Metal Pollution in Soils Around Recycled Lead Industrial Park

The pollutions and sources of heavy metals in soils around a recycled lead industry park were analyzed by a method combining multivariate statistics and geo-statistics. The results showed that the average contents of Pb, Cd, As, Cr, Cu, Ni and Zn were 124.05, 0.394, 21.18, 82.72, 24.23, 35.47 and 62.04 mg/kg, respectively. The concents of Pb, Cd and As were 3.96, 1.90 and 0.84 times higher than the corresponding background values. The contents of Pb and Cd in soils near the industry park area were higher, and appeared to be a center island spatial distribution and diffusion trends in the eastern; as content was accumulated in the farmland far away from the industry park. Source analysis showed that Pb and Cd pollutions were mainly come from the industrial park, while As pollution was affected by agricultural production activities.