水资源保护2012，Vol.28Issue(5)：34-37,47,5.DOI:10.3969/j.issn.1004-6933.2012.05.007
东江下游水环境重金属污染特征及现状评价
Assessment of heavy metal pollution downstream of Dongjiang River
摘要
Abstract
The water quality and concentrations of heavy metals including As, Ni, Pb, Cd, Cu, Zn, Cr, and Hg in surface sediments at eight monitoring sections of the Dongjiang River's main stream, its tributaries, and the Dongguan Canal downstream were examined. The index of geo-accumulation and potential ecological risk evaluation methods were used to evaluate the potential ecological risk of heavy metal pollution downstream of the Dongjiang River. The results show that heavy metals had accumulated in the surface sediments downstream of the Dongjiang River. The enrichment extent of Cd, according to the index of geo-accumulation, was very intense, the enrichment extent of Hg was moderate, and that of Cu and Zn was moderate in the main stream but intense in the tributaries and the Dongguan Canal. The potential ecological risk assessment shows that the ecological risk index was close to or greater than 300 downstream of the Dongjiang River, including the main stream, tributaries, and the canal, indicating that the total potential ecological risk caused by heavy metals was severe. Cd, Hg, and Cu were the main heavy metals contributing to the potential ecological risk, and their hazard ratings were in the following descending order; Cd, Hg, and Cu. The results from water quality monitoring show that the water quality downstream of the Dongjiang River was worrying during the dry period, when the concentration of Hg exceeded the Class Ⅲ standard of the Environmental Quality Standards for Surface Water.关键词
水环境/重金属污染/地积累指数法/潜在生态风险评价法/东江下游Key words
water environment/ heavy metal pollution/ index of geo-accumulation/ potential ecological risk evaluation/ downstream of Dongjiang River分类
资源环境引用本文复制引用
王艳捷,宋乾武,陈洪伟,代晋国,张玥,姜萍..东江下游水环境重金属污染特征及现状评价[J].水资源保护,2012,28(5):34-37,47,5.基金项目
国家水体污染控制与治理科技重大专项(2009ZX07529-002-004) （2009ZX07529-002-004）
