摘要
通过对钱塘江杭州段表层沉积物中重金属Cu、Zn、Pb、Cd、Hg、As含量的调查,分析了该水域表层沉积物中重金属含量水平、空间分布特征,并对其潜在生态风险和来源进行了评价分析。结果显示,水域表层沉积物中存在一定的重金属污染,生态风险水平总体为极强,Cd、Hg是生态风险主要的贡献因子,生态风险强度分别为极强、强。重金属在水域不同区段间存在一定的分布差异,其中S3区段重金属的含量及生态风险均较高。各重金属污染来源相似,主成分分析法(Principal Component Analysis,PCA)显示,工农业污染、交通污染、生活废水污染等人类活动是水域表层沉积物中重金属的主要来源。进一步探求沉积物中重金属风险对水域中鱼类的影响表明,Hg的生物表层沉积物累积因子(BSAF)为0. 861,存在一定的生物累积作用;但表层沉积物与鱼肉、水体之间相关性较弱(P> 0. 05)。水域中水体流动性大且多数鱼类来自增殖放流,鱼龄较低可能是造成上述现象的主要原因。
The concentrations and distributions of heavy metals Cu,Zn,Pb,Cd,Hg,and As in surface sediments were investigated with the samples collected from the Qiantang River.Then we analyzed the potential ecological risk of heavy metal with the Hakanson ecological risk index and searched for its source based on Pearson correlation coefficient and principal component analysis（PCA）.Results showed that the concentrations of Cu,Zn,Pb,Cd,Hg and As in surface sediments of Qiantang River were rather high,the overall potential ecological risk level was extremely high.Cd and Hg were the prominent factors for ecological risks in surface sediments,showing the intensity of potential risk as extremely strong and strong,respectively.There was a certain distribution difference with different sections of the river,among which the concentrations and potential ecological risks in S3 section were both higher than others.It was likely that the sources of heavy metals in surface sediments were similar;industrial pollution,agricultural non-point source pollution,traffic pollution and domestic wastewater were the probable sources by the method of PCA.Besides,we determined the effects of heavy metal with surface sediment on fish in Qiantang River.Results showed that the biotasurface sediment accumulation factor（BSAF）of Hg was 0.861,which presented a bioaccumulation to fishes.However,the average levels of heavy metals in surface sediments presented low correlations with fish on overlying water samples.It may be caused by the fact that the water in Qiantang River flowed fast and the majority of fish investigated were from proliferation of releasing of young age.
作者
施沁璇
盛鹏程
房伟平
孙博怿
周冬仁
王俊
徐磊
吴琦芳
SHI Qinxuan;SHENG Pengcheng;FANG Weiping;SUN Boyi;ZHOU Dongren;WANG Jun;XU Lei;WU Qifang(Agriculture Ministry Key Laboratory of Healthy Freshwater Aquaculture,Huzhou 313001,Zhejiang,China;Key Laboratory of Fish Health and Nutrition of Zhejiang Province,Huzhou 313001,Zhejiang,China;Zhejiang Institute of Freshwater Fisheries,Huzhou 313001,Zhejiang,China;Changxing Department of Agriculture,Huzhou 313100,Zhejiang,China)
出处
《上海海洋大学学报》
CAS
CSCD
北大核心
2018年第5期710-717,共8页
Journal of Shanghai Ocean University
基金
浙江省科技计划项目(2017C02026)
浙江省科技计划项目(2015F30020)
