摘要
沱江流域上游储有丰富的磷矿资源,开发利用的同时会产生一系列的污染物,并通过表水冲刷等途径进入水体,最终富集于沉积物中,对沱江流域沿岸产生重要的影响。以沱江流域上游表层沉积物为研究对象,查明了沉积物中重金属元素的含量及空间分布特征,探讨重金属来源,对重金属元素进行潜在生态风险评价和地累积指数评价。RI值显示,流域整体属于中等潜在生态危害。5、15号点处于很强的潜在生态危害,6、9、11号点为强的潜在生态危害。地累积指数结果表明绵远河中Pb、Cd为轻微-中度污染。
As the rich phosphate resources of upstream of Tuojiang River basin, the pollutants produced by development and utilization could be eroded into the water body through the surface water and were eventually concentrated in sediments. This phenomenon had important influence along the Tuojiang River basin. This paper regarded the surface sediments of upstream of Tuojiang River as the research object, researched the contents and distribution characteristics of heavy metals in sediments, discussed the sources of heavy metals, and evaluated the potential ecological risk assessment and evaluation index of geoaccumulation. The RI showed the medium potential ecological risk of the whole river basin, the points of 5#, 15# were under strong potential ecological hazard, and points of 6#, 9#, 41# showed strong potential ecological hazard. The cumulative index results showed in Mianyuan River was under mild - moderate Pb and Cd contamination.
出处
《四川环境》
2016年第4期29-35,共7页
Sichuan Environment
基金
国家自然科学基金"富磷水系铀的赋存形式及分配"项目(41373120)
中国地质调查局项目(子项目编码:2120113002301)
关键词
沱江
重金属
分布特征
环境评价
Tuojiang
heavy metal
spatial distribution
assessment of environment
