作　　者： ; ; ; ; ; ;

机构地区： 广东工业大学环境科学与工程学院

出　　处： 《环境污染与防治》 2013年第11期56-61,65,共7页

摘　　要： 广西龙江河镉污染事故给当地的水生态环境造成了严重影响,为全面了解龙江河镉污染事故后表层沉积物中镉的污染特征与潜在生态风险及对下游珠江水系的影响,在龙江河上游未污染河段、龙江河污染及受影响河段、下游柳江河段共17个采样点采集了水样和沉积物样品,采用地积累指数法和潜在生态风险指数法对调查河段的沉积物镉污染进行分析和评价。结果表明,事故应急结束后水质镉含量稳定达标;沉积物镉含量总体已趋于降低,部分河段其污染程度仍很严重,生态风险等级高,地积累指数大多大于5,镉的潜在生态风险指数达到1 000以上;沉积物中镉对水生态环境的影响有待进一步观察和研究。 The cadmium pollution accident occurred in Longjiang River, Guangxi has caused serious influence to local aquatic ecology environment. In order to find out the cadmium pollution characteristics and its potential ecological risk in sediments of Longjiang River, as well as got the full understanding of the influence of cadmium pollution accident to the downstream of the Pearl River, we collected water and sediments specimens from 17 sampling sites which distributed in upstream unpolluted reaches, polluted or affected reaches of Longjiang River and downstream Liujiang River reaches. The index of geo-aceumulation and potential ecological risk index were then employed to eval- uate the pollution degree of Cd in the sediments. The results indicated that Cd concentration of water reached the standard of drinking water quality after emergency accident. The sediments in part of Longjiang River had been still severely contaminated by Cd and the ecological risk remained at high level, the geo-accumulation value was greater than 5,and the value of ecological risk index was higher than 1 000,although sediment cadmium content already tended to decrease in generally. The influence of cadmium in sediment to aquatic ecological environment needs further observation and study.

关 键 词： 镉 龙江河 沉积物 地积累指数 潜在生态风险指数

领　　域： [环境科学与工程]