湘江流域衡阳段沉积物重金属污染特征及风险评价
Pollution Characteristics and Risk Assessment of Heavy Metals in Sediments from the Hengyang Section of the Xiangjiang River Basin
投稿时间:2020-04-26  修订日期:2022-03-25
中文关键词:湘江流域衡阳段  沉积物  重金属  地累积指数法  潜在生态危害指数法
英文关键词:Hengyang section of Xiangjiang River basin  sediment  heavy metal  geoaccumulation index  potential ecological risk index
基金项目:
作者单位
邱国良 湖南省衡阳生态环境监测中心湖南 衡阳 421001 
陈泓霖 湖南省衡阳生态环境监测中心湖南 衡阳 421001 
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中文摘要:
      为了解湘江流域衡阳段沉积物重金属污染变化趋势及生态风险,利用2015-2019年湘江流域衡阳段各河流沉积物重金属元素监测结果,采用地累积指数法及潜在生态危害指数法,对沉积物中9种重金属的污染特征及生态风险进行了评价。地累积指数法评价结果表明,湘江干流及4条主要支流沉积物普遍存在镉(Cd)污染,部分河流砷(As)、汞(Hg)、铅(Pb)、铜(Cu)、锌(Zn)、锰(Mn)有一定程度的污染,钒(V)、铬(Cr)多为无污染或无污染到中度污染。潜在生态危害指数法评价结果表明,As、Cd、Hg、Cu呈现出中等生态危害至极强生态危害程度;9种重金属总潜在生态危害指数从高到低为舂陵水(1316)>耒水(718)>湘江干流(609)>蒸(515)水>洣水(441),舂陵水、耒水、湘江干流均为很强生态危害程度,蒸水、洣水为强生态危害程度。两种评价方法均表明,湘江流域衡阳段各河流沉积物重金属以舂陵水污染最为严重,其次为耒水、湘江干流,蒸水、洣水受污染相对较轻;舂陵水、耒水、洣水、湘江干流4条河流沉积物重金属2017-2019年污染较2015-2016年有所减轻。
英文摘要:
      Xiangjiang River is among the rivers most heavily polluted with heavy metals in China. In this study, we characterized heavy metal pollution and the ecological risk of sediments from the Hengyang section of the Xiangjiang River basin, including the mainstem and four important tributaries (Chongling River, Leishui River, Zhengshui River and Mishui River). The aim was to evaluate the effectiveness of treating heavy metal pollution in the study area and provide data to support continuing pollution control and treatment. The study was based on the monitoring results of nine heavy metal elements (Cd, As, Hg, Pb, Cu, Zn, Mn, V, Cr) in the sediments of 11 sampling transects in the study area from 2015 to 2019. Pollutant characteristics and ecological risk of the nine heavy metals were analyzed using the geoaccumulation index method and potential ecological risk index. Results show that Cd pollution was common and heavy in the mainstream and all four tributaries. As, Hg, Pb, Cu, Zn, Mn pollution has occurred at some sites to varying extents, and V and Cr pollution was absent or light to moderate. The potential ecological risk index shows that As, Cu in Chongling River and Cd, Hg in all the rivers presented high to extremely high ecological risk. The total potential ecological hazard index of the nine heavy metals in the study area was in the order, Chongling River (1316) > Leishui River (718) > Xiangjiang River mainstream (609) > Zhengshui River (515) > Mishui River (441). The ecological hazard of Chongling River, Leishui River and the main stem of Hengyang section was very high, and high in the Zhengshui and Mishui Rivers. To summarize, the geoaccumulation index and potential ecological hazard index both indicate that heavy metal pollution was most serious in Chongling River, followed by Leishui River and the Xiangjiang mainstream, and pollution in Zhengshui River and Mishui River was relatively light. Furthermore, heavy metal pollution in Chongling River, Leishui River, Mishui River and the mainstream of Xiangjiang River was lower in 2017-2019 than in 2015-2016.
邱国良,陈泓霖.2022.湘江流域衡阳段沉积物重金属污染特征及风险评价[J].水生态学杂志,43(2):125-132.
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