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珠江(广州河段)表层沉积物中重金属的生态风险研究 被引量:18

STUDY ON THE ECOLOGICAL RISK OF HEAVY METALS IN THE SURFACE SEDIMENTS IN GUANGZHOU SECTION OF THE PEARL RIVER
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摘要 随着广州市截污工程的实施,珠江(广州河段)外源污染得到有效控制后,沉积物内源污染将成为影响河流水质的重要因素。我们测定了珠江(广州河段)沉积物中Cu、Pb、Zn、Cr、Cd、Hg和As 7种重金属的浓度,研究了它们的分布特征和潜在生态风险。结果表明:在主干流河道的顺流断面中,各种重金属元素整体上表现出明显的倒"W"型分布。在各内河涌的各监测断面中,花地涌沉积物中重金属浓度最高,乌涌最低,其余各河涌居中。各种重金属元素的空间分布特征基本相似,除了Hg与Cd、Cr、As之外,其他各元素之间均呈现较明显的正相关关系,尤其是Cr和Cd、Cu和Cd、Cr和Cu之间的相关性显著,表明这些重金属元素在沉积物中的浓度具有共同变化的趋势。潜在生态危害指数法的评价结果显示,7种重金属元素的生态危害系数的大小顺序为:Hg>Cd>Cu>As>Pb>Zn>Cr,其中Hg是最主要的生态风险因子。对单个重金属的潜在生态危害系数(Eir)和多个重金属的潜在生态危害指数(RI)的分析,生态风险最大的断面是5#(黄歧)、6#(黄沙)、16#(花地涌北出口)、7#(横滘)和14#(增埗桥)。 The internal pollution sources are going to be the main factors to influence the water quality of river,with the implementation of interception project,which had effective control of exotic pollution sources in Guangzhou section of the Pearl River.We investigated Cu,Pb,Zn,Cr,Ni,Cd,Hg and As contents,distribution characteristics and potential ecological risk in the surface sediments in Guangzhou section of the Pearl River.The results showed that heavy metal appeared inverted "W" on longitudinal distribution ...
出处 《水生生物学报》 CAS CSCD 北大核心 2008年第6期802-810,共9页 Acta Hydrobiologica Sinica
基金 广东省自然科学基金重点项目(项目编号:031549)资助
关键词 沉积物 重金属 生态风险 Sediment Heavy metal Ecological risk
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参考文献28

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