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巢湖湖区底泥重金属污染状况评估
钱贞兵,唐晓先,徐升,陈超,高芮
0
(安徽省环境监测中心站,合肥 230071;巢湖管理局环境保护监测站,合肥 238000)
摘要:
底泥是河湖的沉积物,是自然水域的重要组成部分,水体底泥污染是世界范围内的一个环境问题,当前对底泥的污染缺乏深入研究。以巢湖湖区底泥为研究对象,连续2年对湖区底泥中pH、Cd、Hg、As、Pb和Cr 6项进行监测,选用标准值采用内梅罗综合污染指数法来评价监测点位的污染状况,通过方差分析法来评价两年数据的差异性;采用插值法绘出湖区底泥各重金属元素空间分布;采用地积累指数法来评价底泥中各重金属污染程度。评价结果显示,巢湖湖区底泥污染程度等级为清洁,2年的监测数据无显著性差异,湖区中部重金属含量相对较低,湖区底泥重金属污染程度总体不高,其中Hg的污染程度相对较大,Cd、Pb次之。
关键词:  巢湖  底泥  重金属污染  空间分布  地积累指数
DOI:10.13610/j.cnki.1672-352x.20180825.034
基金项目:巢湖市水源优化与水质保障技术研究与示范(2014ZX07405-003-05)资助。
Assessment of heavy metal pollution in sediment in Chaohu Lake
QIAN Zhenbing,TANG Xiaoxian,XU Sheng,CHEN Chao,GAO Rui
(Anhui Environmental Monitoring Center, Hefei 230071;Environmental Protection Monitoring Station of Chaohu Administration Bureau, Hefei 238000)
Abstract:
The sediment of the river and lake is an important part of the natural waters. Sediment pollution of water is worldwide environmental issue and now lack of intensive study. In this paper, we focused on the sediments of the Chaohu Lake and monitored the indexes of pH, Cd, Hg, As, Pb and Cr for two consecutive years. We used the Nemerow index to evaluate the pollution conditions, meanwhile, we adopted variance analysis to evaluate the difference between the two consecutive years, plotted the spatial distribution of heavy metals in the sediments of the lake area by interpolation, and used the geo-accumulation index to ascertain the pollution degree of heavy metals. The results showed that the pollution degree of sediments was clean, and there was non-dominant difference during the two years. The contents of heavy metals in the middle of the lake area were relatively low. The degree of heavy metal pollution in the sediments of the lake area is generally not high, of which the pollution level of Hg is relatively large, and that of Cd and Pb came next.
Key words:  Chaohu Lake  sediment  heavy metal  spatial distribution  geo-accumulation index

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