天津滨海新区黑潴河沉积物中重金属污染特征及地区性重金属污染指标选择

测定了天津滨海新区境内黑潴河沉积物中8种重金属(Cu，Cd，As，Pb，Cr，Zn，Ni和Hg)的质量分数，用富集因子法和潜在生态危害法进行了风险评价表明，黑潴河表层沉积物中w(Hg)和w(Cd)偏高，存在较高的生态风险，其余重金属的生态风险较低. 采用相关性分析和主成分分析法对重金属的来源进行分析表明，Zn，Cr和Ni主要受控于自然因素，来源于自然环境中的母岩侵蚀；As和Cu主要受控于人为的农业生产活动；Cd和Hg来源于污水灌溉、周围地区化石燃料的燃烧以及生活废物的排放等；Pb的来源同时受控于自然因素和人为活动因素，但以人为因素为主. 此外，对文献报道的天津地区各类水体沉积物和土壤中的重金属的污染程度进行比较分析，并与区域内植物和鱼类体内重金属富集程度相联系， 结果表明，Cd和Hg的富集倍数显著偏高，是天津地区重金属污染的指示指标. 

Pollution Characteristics of Heavy Metals in Sediment from Heizhu River in Tianjin Binhai New Development Area and Selection of Regional Heavy Metal Pollution Indicators

The concentrations of eight heavy metals(Cu,Cd,As,Pb,Cr,Zn,Ni and Hg) were determined in the sediments of the Heizhu River in Binhai New Development Area,Tianjin,China.Enrichment factors and potential ecological risk indices were calculated to evaluate the environmental risk of these contaminants.Results showed that the concentrations of Hg and Cd were relatively high and posed greater ecological risk,while minimal risks were found for the other six heavy metals in the surface sediments of the Heizhu River....