排污河道沉积物中重金属风险评价  

Risk Assessment of Heavy Metals in Sediment of Urban Sewage River

作　　者：李亚男[1] 王国英[1] 逯新宇[1] 马小丽[1] 岳秀萍[1] 

机构地区：[1]太原理工大学环境科学与工程学院,山西太原030024

出　　处：《中国给水排水》2014年第21期103-105,109,共4页China Water & Wastewater

基　　金：山西省留学回国人员科技活动择优资助项目(143140108-S);山西省科技攻关项目(20120311008-1);太原理工大学校基金资助项目(2013Z007)

摘　　要：以华北某市DG排污河道为研究对象,在该排污河上科学布点,采集沉积物样品,检测分析了样品中重金属镉、锌、铜、铅、铬、镍、锰的含量。采用地积累指数法和平均沉积物质量基准系数法对DG排污河的重金属污染状况进行了风险评价。结果表明,目标河道沉积物中Cd、Zn、Cu累积较严重,是主要重金属污染物,且Cd处于最高污染水平。沉积物样品中Cd、Zn、Cu的毒性比例较大,非毒性比例较小。目标河道沉积物中重金属的综合作用使得该排污河道具有潜在生物毒性。Taking the DG sewage river in a city in north China as the study object, samplingpoints were arranged and sediment samples were collected. Concentrations of seven kinds of heavy met- Ms, which were Cd, Zn, Cu, Pb, Cr, Ni and Mn, were determined. Geoaccumulation index and mean sediment quality guideline quotient were applied to assess the environmental risk of heavy metal pollution. As a result, Cd, Zn and Cu were accumulated heavily, and thus they were regarded as the main metal pollutants. Pollution caused by Cd reached the most serious degree. The toxicity of Cd, Zn and Cu ac- counted for a higher percentage, and the non-toxicity proportion of those metals were relatively small. The combined pollution of each heavy metal in the river sediment made the sewage river in a potential biologi- cal toxicity state.

关 键 词：沉积物 重金属 地积累指数法 平均沉积物质量基准系数法 潜在生物毒性 

分 类 号：X824[环境科学与工程—环境工程]