Assessing heavy-metal contamination and sources by GIS-based approach and multivariate analysis of urban-rural topsoils in Wuhan, central China
Assessing heavy-metal contamination and sources by GIS-based approach and multivariate analysis of urban-rural topsoils in Wuhan, central China
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DOI：
10.1007/s10653-009-9265-2
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发表时间：
2010-02-01
影响因子：
4.2
通讯作者：
Li, Zhong-gen
中科院分区：
文献类型：
--
作者：
Gong, Min;Wu, Li;Li, Zhong-gen
对武汉市城乡结合部477个表层土壤样品中Cd、Co、Cr、Cu、Hg、Mn、Pb、Ni和Zn等9种潜在有害重金属进行了测定，以确定其含量和可能来源，并对其空间变异性进行风险评价。结果表明，大部分农村地区土壤重金属含量与自然背景值相近，但Cd、Cu、Hg、Pb和Zn含量在人口密集区和工业设施周围较高。多变量分析（相关矩阵、主成分分析和聚类分析）表明，Cd、Cu、Hg、Pb和Zn主要来源于人为输入，Co、Cr和Mn受自然源控制，而Ni则受人为和自然源共同影响。风险评价结果表明，近48%的研究区遭受中度至重度污染。
Nine potentially harmful heavy metals (Cd, Co, Cr, Cu, Hg, Mn, Pb, Ni, and Zn) were measured in 477 topsoil samples collected from urban-rural areas in the city of Wuhan in order to identify their concentrations and possible sources, and characterize their spatial variability for risk assessment. Results showed that in most rural areas heavy-metal concentrations in soil were similar to their natural background values, but Cd, Cu, Hg, Pb, and Zn concentrations were relatively higher in densely populated districts and around industrial facilities. Multivariate analyses (correlation matrix, principal component analysis, and cluster analysis) indicated that Cd, Cu, Hg, Pb, and Zn were mainly derived from anthropogenic inputs, and Co, Cr, and Mn were controlled by natural source, whereas Ni appeared to be affected by both anthropogenic and natural sources. The result of risk assessment indicated that nearly 48% of the study area suffered from moderate to severe contamination.