赣江上游沉积物重金属空间分布及污染特征

为了解赣江上游表层沉积物重金属污染特征,采集赣江上游38个样品,采用电感耦合等离子体质谱仪(ICP-MS,Agilent 8800)分析沉积物中重金属含量,结合内梅罗综合污染指数法、地累积指数法、主成分分析及沉积物质量基准等研究赣江上游沉积物中重金属污染程度,分析污染物可能的来源及评价其存在的生态风险。结果表明:赣江上游沉积物中W、Cr、Mn、Cu、Zn、As、Cd、Hg、Pb等9种重金属的平均含量分别为12.30、4.40、999.84、9.72、293.81、47.66、2.85、1.34、63.68 mg·kg-1;除Cr和Cu外,其余7种重金属的平均值均超过江西省土壤背景值。内梅罗综合污染评价表明,赣江上游表层沉积物中47.37%的采样点呈严重污染,28.95%采样点污染明显,其中污染程度章水段>桃江段>贡江段;地积累指数法显示,Mn、As、W、Pb呈轻度污染,Cd和Hg呈中度或偏重度污染;主成分分析显示,As、W、Hg、Pb具有相似的污染源,Cr和Mn具有相似的污染源;沉积物质量基准分析表明,对底栖生物可能产生毒性效应的重金属主要是Cd和Hg,主要分布在章水段和桃...

Spatial distribution and pollution characteristics of heavy metals in sediments of the upper reaches of Ganjiang River.

We collected 38 samples from the upper reaches of the Ganjiang River,Jiangxi,China,with the aim to clarify the characteristics of heavy metal pollution in the surface sediments The contents of heavy metals in sediments were analyzed by inductively coupled plasma mass spectrometer(ICP-MS,Agilent 8800).The Nemerov comprehensive pollution index,geoaccumulation index,principal component analysis and sediment quality benchmarks were used to investigate the pollution degree of heavy metals and their possible sources,and to evaluate the ecological risks.The results showed that the average contents of nine heavy metals including W,Cr,Mn,Cu,Zn,As,Cd,Hg and Pb were 12.30,4.40,999.84,9.72,293.81,47.66,2.85 and 1.34,63.68 mg·kg-1,respectively.Except for Cr and Cu,the average of heavy metals exceeded the soil background value of Jiangxi Province.The results of Nemerov comprehensive pollution index assessment showed that 47.37%of the sampling points in the surface sediments were seriously polluted,and 28.95%of the sampling points were obviously polluted.The pollution degree was in the order of Zhangshui section>Taojiang section>Gongshui section.According to the results of geoaccumulation index assessment,Mn,As,W and Pb were mildly polluted,while Cd and Hg were moderately or heavily polluted.Results of principal component analysis showed that As,W,Hg and Pb had similar pollution sources,while Cr and Mn had similar pollution sources.The results of sediment quality baseline analysis showed that Cd and Hg were the major heavy metals that might have toxic effects on benthos,mainly distributed in Zhangshuisection and Taojiang section.