Distribution, sources and ecological risk assessment of heavy metals in surface sediments from Lake Taihu, China
Distribution, sources and ecological risk assessment of heavy metals in surface sediments from Lake Taihu, China
复制标题
太湖表层沉积物重金属分布、来源及生态风险评价
DOI：
10.1088/1748-9326/6/4/044012
复制
发表时间：
2011-10-01
影响因子：
6.7
通讯作者：
Fan, Chengxin
中科院分区：
文献类型：
--
作者：
Yin, Hongbin;Gao, Yongnian;Fan, Chengxin
研究了太湖表层沉积物中重金属的分布、来源及生态风险。结果表明，重金属的空间分布具有多样性，其来源和控制因素较为复杂。Pearson相关分析表明，除Cd外，总磷和烧失量与其它重金属均呈正相关。主成分分析和聚类分析表明，Hg、Cu、Cr、Cd和Pb可能来源于生活污水和工业废水，而As主要来源于自然过程。潜在生态风险指数表明，五里湖、贡湖湾和西北区沉积物污染严重，太湖其他区域为中度污染。将金属水平与低效应范围（ERL）和中效应范围（ERM）进行比较，结果表明，在所调查的地点中，有13.6-72.3%的金属超过了相应的低效应范围限值（As为72.3%，Pb为52.4%，Cu为27.7%，Cd为22.8%，Hg为16.0%，Cr为13.6%）。此外，分别有3.90%和0.50%的采样点超过汞和铅的ERM阈值。
The distribution, sources and ecological risk of heavy metals in surface sediments from Lake Taihu were studied. Results showed that the measured heavy metals had varied spatial distribution patterns, indicating that they had complex origins and controlling factors. Pearson’s correlation analysis revealed that the total phosphorus and the loss on ignition were positively correlated with the measured metals except Cd. Principal component analysis and cluster analysis demonstrated that Hg, Cu, Cr, Cd and Pb might originate from domestic sewage and industrial wastewater, whereas As predominantly originated from natural processes. Potential ecological risk indices indicated that sediment from Wuli Lake, Gonghu Bay and the Northwest Area suffered high pollution, whereas other areas of Lake Taihu were moderately polluted. A comparison of metal levels with the effects range low (ERL) and effects range median (ERM) showed that metals exceeded their corresponding ERL limit at 13.6–72.3% (72.3% for As, 52.4% for Pb, 27.7% for Cu, 22.8% for Cd, 16.0 for Hg and 13.6% for Cr) of the sites investigated. Moreover, 3.90% and 0.50% of the sites sampled exceeded the ERM thresholds for Hg and Pb, respectively.