安庆沿江湖泊及长江安庆段沉积物重金属污染特征及生态风险评价

发布时间：2018-04-11 02:40

本文选题：重金属 + 生态风险评价　；参考：《农业环境科学学报》2017年03期

【摘要】：为研究安庆沿江湖泊及长江安庆段重金属污染特征及潜在的生态风险,采集了安庆沿江湖泊及长江安庆段沉积物样品共58个,分析了Cu、Zn、Pb和Cd共4种重金属分布特征,并采用地累积指数法和Hakanson生态危害指数法进行生态风险评价,结果表明:不同水体沉积物重金属含量差异较大,市区湖泊群内各重金属含量普遍高于周边生态湖泊和长江安庆段;与区域对应的沉积物重金属背景值比较,市区湖泊群中各类重金属普遍高于背景值,而其他水体沉积物中的重金属则与背景值相近,表明市区工业生产及生活等人类活动对湖泊沉积物重金属含量有较大影响。地累积指数污染评价表明安庆市区湖泊群受到一定程度的重金属污染,尤其是Cd污染达到了中度污染程度。总的看来,所有安庆沿江湖泊及长江安庆段沉积物中各重金属污染的程度依次为CdPbZnCu。生态风险评价表明市区湖泊群和菜子湖处于中等生态危害状态,其他水体均处于低生态风险状态,各水体潜在生态危害顺序依次为市区湖泊群、菜子湖、长江安庆段、嬉子湖、石门湖、白荡湖;研究区域沉积物中的重金属生态风险以Cd为主。
[Abstract]:In order to study the characteristics of heavy metal pollution and potential ecological risks in Anqing lake and Anqing section of Yangtze River, 58 samples of sediments from Anqing lake and Anqing section of Yangtze River were collected, and the distribution characteristics of four heavy metals, Cu, Zn, Pb and CD, were analyzed.The ecological risk assessment was carried out by using the land accumulation index method and the Hakanson ecological hazard index method. The results showed that the heavy metal contents in the sediments of different water bodies varied greatly.The contents of heavy metals in urban lakes are generally higher than those in the surrounding ecological lakes and the Anqing section of the Yangtze River, and compared with the background values of sediments in the region, the heavy metals in urban lakes are generally higher than the background values.The heavy metals in the sediments of other water bodies are similar to the background values, indicating that human activities such as industrial production and living in urban areas have great influence on the heavy metal contents in lake sediments.The accumulative index pollution evaluation showed that the lake groups in Anqing city were polluted by heavy metals to some extent, especially the CD pollution reached a moderate level.In general, the degree of heavy metal pollution in the sediments of all Anqing lakes along the Yangtze River and the Anqing section of the Yangtze River is CdPbZnCu.Ecological risk assessment showed that lake group and Caizi lake in urban area were in medium ecological hazard state, and other water bodies were in low ecological risk state. The order of potential ecological hazards of each water body was urban lake group, Caizi lake, Anqing section of Yangtze river and Yuzi lakeThe ecological risk of heavy metals in the sediments of Shimen Lake and Baidang Lake was mainly CD.
【作者单位】：安庆师范大学资源环境学院;中国科学院生态环境研究中心环境化学与生态毒理学国家重点实验室;农业部环境保护科研监测所产地环境监测与预警创新团队;
【基金】：国家自然科学基金项目(21577157) 安徽省自然科学基金项目(1608085QD76,1708085MB40)~~
【分类号】：X52;X820.4

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