生态环境学报2016，Vol.25Issue(9)：1515-1521,7.DOI:10.16258/j.cnki.1674-5906.2016.09.014
太湖主要入湖河口表层沉积物重金属分布特征及风险评价
Distribution and Risk Assessment of Heavy Metals in the Surface Estuarine Sediments of Main Inflow Rivers in Taihu Lake
摘要
Abstract
To reveal the distributive characteristics and ecological risk of heavy metals in the estuarine sediment of the inflow rivers in Taihu Lake, surface sediments were collected from the estuaries of 12 inflow rivers located in the western and northern shores of Taihu Lake. Concentrations of five heavy metals (Cu, Zn, Ni, Pb, Cd) were quantified for the sampled sediments, and the spatial distribution characteristics were analyzed. The pollution extent and potential ecological risk of each heavy metal were evaluated based on the geo-accumulation index (Igeo) and the potential ecological risk factor (riE) respectively. The results indicated that all of the 12 main inflow rivers had been confronted with heavy metal contamination to certain extents in the surface estuarine sediments. The average concentrations of Cu, Zn, Ni, Pb, Cd were 63.04, 173.11, 56.71, 37.05, 2.23 mg∙kg-1 respectively. Spatial heterogeneity was found in the distribution of different heavy metals: the estuaries of inflow rivers Daganghe (DGH), Wuxigang (WXG), Miaodugang (MDG), Dapugang (DPG), Chendonggang (CDG), Guandugang (GDG), Hongxianggang (HXG) and Shedugang (SDG) were mainly polluted by Cd, while the estuaries of Shatanggang (STG), Taigeyunhe (TG), Zhihugang (ZHG) and Liangxihe (LXH) were polluted by a combination of Cu, Zn, Ni and Pb. According to geo-accumulation index (Igeo), the pollution extent of heavy metals in surface sediment followed the order as: Cd>Cu>Zn>Ni>Pb. According to ecological risk factor (riE), the potential ecological risk of heavy metals in surface sediment followed the order as: Cd>Cu >Ni>Pb>Zn, and Cd was the major pollutant for risk. Among the 12 inflow rivers’ estuaries, MDG and SDG were of serious ecological risk, DGH, WXG, DPG, GDG and HXG were of severe ecological risk, CDG and TG were of moderate ecological risk, STG, ZHG, LXH were of low ecological risk. It was demonstrated that the levels of potential ecological risk of heavy metals in the estuaries of inflow rivers located between DGH and SDG were higher than that between STG and LXH, yet attentions should also be paid to the accumulation of Cu, Zn, Ni and Pb in the estuarine sediments between STG and LXH.关键词
太湖/入湖河口/表层沉积物/重金属/风险评价Key words
Taihu Lake/estuaries of inflow rivers/sediment/heavy metals/risk assessment分类
资源环境引用本文复制引用
闫兴成,杨晓薇,黄烯茜,董傑靖,王明玥,韩睿明,王国祥..太湖主要入湖河口表层沉积物重金属分布特征及风险评价[J].生态环境学报,2016,25(9):1515-1521,7.基金项目
国家水体污染控制与治理重大专项（2012ZX07101-008-02）；江苏省太湖水环境综合治理科研项目（JSZC-G2014-212）；国家自然科学基金项目（41403064）；江苏省教育厅基础研究计划（自然科学基金）青年基金项目（BK20140922）；江苏省教育厅高校自然科学研究面上项目 （）
