Assessing soil heavy metal pollution in the water-level-fluctuation zone of the Three Gorges Reservoir, China
Assessing soil heavy metal pollution in the water-level-fluctuation zone of the Three Gorges Reservoir, China
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DOI：
10.1016/j.jhazmat.2011.04.090
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发表时间：
2011-07-15
影响因子：
13.6
通讯作者：
Zhang, Quanfa
中科院分区：
文献类型：
--
作者：
Ye, Chen;Li, Siyue;Zhang, Quanfa
三峡水库消落带（145-175 m）经历了半年（5 ~ 9月）夏季暴露、半年（10 ~ 4月）冬季淹没的新水文情势。2008年9月（淹没前）和2009年6月（淹没后），在WLFZ的12个站点采集土壤样品，并对重金属（Hg，As，Cr，Cd，Pb，Cu，Zn）进行了分析。Fe和Mn）。分别采用富集因子法、因子分析法和因子分析-多元线性回归法进行重金属污染评价、来源识别和来源解析。结果表明，淹没前后重金属元素的空间变异性较大，其中As、Cd、Pb、Cu、Zn等元素在上游和下游均较高。FA和FA-MLR结果表明，淹没前As和Cd是主要污染物，其中45%以上的As来自生活污水，59%以上的Cd来自工业废渣。淹没后，主要污染物是汞，镉，铅，交通废气贡献约81%的汞和工业废水约36%和73%的镉和铅，分别。我们的研究结果表明，增加航运和工业废物沉积了大量的重金属已积累在WLFZ淹没期间。(C)2011 Elsevier B. V.保留所有权利。
The water-level-fluctuation zone (WLFZ) between the elevations of 145-175 m in China's Three Gorges Reservoir has experienced a novel hydrological regime with half a year (May-September) exposed in summer and another half (October-April) submerged in winter. In September 2008 (before submergence) and June 2009 (after submergence), soil samples were collected in 12 sites in the WLFZ and heavy metals (Hg, As, Cr, Cd, Pb, Cu, Zn. Fe, and Mn) were determined. Enrichment factor (EF), factor analysis (FA), and factor analysis-multiple linear regression (FA-MLR) were employed for heavy metal pollution assessment, source identification, and source apportionment, respectively. Results demonstrate spatial variability in heavy metals before and after submergence and elements of As, Cd, Pb, Cu, and Zn are higher in the upper and low reaches. FA and FA-MLR reveal that As and Cd are the primary pollutants before submergence, and over 45% of As originates from domestic sewage and 59% of Cd from industrial wastes. After submergence, the major contaminants are Hg, Cd, and Pb, and traffic exhaust contributes approximately 81% to Hg and industrial effluent accounts about 36% and 73% for Cd and Pb, respectively. Our results suggest that increased shipping and industrial wastes have deposited large amounts of heavy metals which have been accumulated in the WLFZ during submergence period. (C) 2011 Elsevier B.V. All rights reserved.