太湖西岸河网沉积物中重金属污染特征及风险评价

发布时间：2018-11-29 12:16

【摘要】：为研究太湖西岸河网沉积物中重金属污染特征及风险,调查了丰-平-枯3个水期19个点位8种重金属的含量,结果表明,沉积物中重金属浓度顺序为ZnCrCuPbNiAsCdHg,其中Cd、Cu、Zn、Pb、Ni明显高于其环境背景值,除As外,其余7种重金属平水期含量高于丰水和枯水期.地累积指数(I_(geo))和潜在生态指数(RI)评价表明,研究区沉积物中Cd属于中等污染程度和中等生态风险,Cd对RI贡献率为35%,重金属生物毒性不利影响评价值(mP EC-Q)范围为0.12~0.76,平均值0.30,表明研究区发生生物毒性不利影响的可能性为15%~29%,工业与生活混合区点位S2从污染程度、生态风险、生物毒性不利影响和主成分评价的污染及风险均最大,表现出多种重金属的协同污染,这与其周围污染排放特征一致,为该区域河流沉积物中重金属污染控制提供依据.
[Abstract]:In order to study the pollution characteristics and risks of heavy metals in sediments of the West Bank of Taihu Lake, the contents of 8 heavy metals at 19 sites in 3 water periods of Fengping and Ku were investigated. The results showed that the concentration of heavy metals in sediments was in the order of ZnCrCuPbNiAsCdHg, and Cd,Cu,Zn,. Pb,Ni was significantly higher than its environmental background value. Except for As, the contents of seven heavy metals in the normal water period were higher than those in the high water and dry water periods. The evaluation of ground accumulation index (I _ (geo) and potential ecological index (RI) showed that Cd in the sediments of the study area was of moderate pollution and moderate ecological risk, and the contribution rate of Cd to RI was 35%. The mP EC-Q of heavy metals ranged from 0.12 to 0.76, with an average of 0.30, indicating that the probability of adverse effects of biological toxicity in the study area was 150.29. The pollution degree, ecological risk, adverse effects of biological toxicity and principal component assessment of S2 in industrial and living mixed area are the largest, showing the synergistic pollution of many heavy metals, which is consistent with the characteristics of pollution emission around it. It provides basis for heavy metal pollution control in river sediment in this area.
【作者单位】：江苏省环境科学研究院;江苏省环境工程重点实验室;河海大学环境学院;
【基金】：江苏省自然科学基金项目(BK20151596) 江苏省“333”工程科研项目(BRA2015524)
【分类号】：X524;X824

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