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引用本文:张立,袁旭音,邓旭.南京玄武湖底泥重金属形态与环境意义.湖泊科学,2007,19(1):63-69. DOI:10.18307/2007.0110
ZHANG Li,YUAN Xuyin,DENG Xu.Speciation of heavy metals in sediments from Lake Xuanwu and their environmental significance. J. Lake Sci.2007,19(1):63-69. DOI:10.18307/2007.0110
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南京玄武湖底泥重金属形态与环境意义
张立1,2, 袁旭音1,2, 邓旭2
1.河海大学水文水资源与水利工程科学国家重点实验室, 南京210098;2.河海大学环境学院, 南京210098
摘要:
通过对玄武湖12个底泥样品采用连续提取的方法, 分别获得湖中6种金属的总量和形态分布数据, 并用因子分析的方法对金属总量进行统计分析.金属总量结果表明, 部分样点的Ni和大部分样点的Cr、Pb、Zn超过背景值, 显示有轻度污染, 这与玄武湖周围的地理环境和人类活动对底泥重金属的影响有关.对金属形态分析的结果表明, 在所测金属中残渣态是主要的存在形式, 其次比例较高的是有机物和硫化物结合态, 而Pb、Zn有潜在的生物危害性.
关键词:  底泥  重金属  生物有效性  玄武湖
DOI:10.18307/2007.0110
分类号:
基金项目:河海大学重点实验室开放基金(2005406711);河海大学科技创新基金(200440401104)联合资助
Speciation of heavy metals in sediments from Lake Xuanwu and their environmental significance
ZHANG Li1,2, YUAN Xuyin1,2, DENG Xu2
1.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, P.R.China;2.Department of Environmental Sciences and Engineering, Hohai University, Nanjing 210098, P.R.China
Abstract:
Six elements (Ni, Cu, Cr, Pb, Mn, Zn) in twelve sediment samples from Lake Xuanwu were studied by BCR sequential extraction method to obtain their distribution features in this region and the data were analyzed with Factorial Analysis method.The results showed that the metal concentrations of Ni, Pb, Zn in some sediments of Lake Xuanwu exceeded the background levels, revealing slight pollution, which were affected by the geological setting and the anthropogenic input.Metals detected was mainly associated with the residual fraction in the lake, and the oxidable fraction was followed.The acid soluble fraction of Pb, Zn had higher percentages in total contents than other four metals, so their potential risk to aquatic organisms must be considered.
Key words:  Sediment  heavy metals  bioavailability  Lake Xuanwu
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