Distribution and speciation of heavy metals in sediments from the mainstream, tributaries, and lakes of the Yangtze River catchment of Wuhan, China
Distribution and speciation of heavy metals in sediments from the mainstream, tributaries, and lakes of the Yangtze River catchment of Wuhan, China
复制标题
长江武汉流域干流、支流及湖泊沉积物中重金属分布及形态
DOI：
10.1016/j.jhazmat.2008.12.034
复制
发表时间：
2009-07-30
影响因子：
13.6
通讯作者：
Tang, Zhenwu
中科院分区：
文献类型：
--
作者：
Yang, Zhifeng;Wang, Ying;Tang, Zhenwu
对长江武汉段干流、支流和湖泊沉积物中重金属（As、Cd、Cr、Cu、Hg、Ni、Pb和Zn）含量进行了比较研究。与武汉市土壤最大背景值相比，Cd是污染程度最高的金属，尤其是在主流土壤中，其次是Zn和Cu。在一些来自支流和湖泊的样本中，汞浓度与背景水平相比非常高。As和Ni在所有站点的浓度波动接近背景水平。从主流，支流和湖泊中提取的样品在沉积物中的每种重金属的形态分配是相似的。与其他金属相比，Cd、Cu、Zn和Pb在三个区域中的生物有效性较高，具有较高的生态风险。A组（Zn，Cu.和铅，r > 0.9）和主流中的B组（铬和镍，r = 0.978）;汞、铜、镉。聚类分析和相关分析表明，湖泊中Pb含量较高（r > 0.9），支流中Cu含量较高（r > 0.9）。然而，低的相关性之间的As和其他元素在三个区域。总的来说，63.6%的干流样品、75.0%的支流样品和88.9%的湖泊样品的重金属生态风险为低、中度，其中干流和支流样品的潜在生态风险高于湖泊样品。(C)2008 Elsevier B. V.保留所有权利。
A comparative study of the heavy metal (As, Cd, Cr, Cu, Hg, Ni, Pb, and Zn) concentrations in sediments collected from the mainstream, tributaries, and lakes of the Yangtze River catchment of Wuhan, China, was conducted. Compared with the maximum background values in Wuhan Province soils, Cd was the metal with the highest contamination level, especially in the mainstream, followed by Zn and Cu. In a few samples from tributaries and lakes, the Hg concentration was very high compared to background levels. The concentrations of As and Ni in all sites fluctuated close to background levels. Partitioning of speciation of each heavy metal in sediments was similar for samples taken from the mainstream, tributaries, and lakes. Compared to the other metals studied, Cd, Cu, Zn, and Pb had higher bioavailability in the three zones, which means they pose a higher ecological risk. Significant correlations among group a (Zn, Cu. and Pb, r > 0.9) and group b (Cr and Ni, r = 0.978) in the mainstream; Hg, Cu, Cd. and Pb in lakes (r > 0.9); and Cu and Pb (r > 0.9) in tributaries were observed using Cluster and correlation analysis. However, a low correlation between As and the other elements in the three zones was shown. Overall, 63.6% of samples from the mainstream, 75.0% from tributaries, and 88.9% from lakes exhibited low and moderate ecological risk of heavy metals, and the potential ecological risks in the mainstream and tributaries were higher than those in lakes. (C) 2008 Elsevier B.V. All rights reserved.