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引用本文:曹源,仇雁翎,杨晓红,李力,朱志良,赵建夫,程炳宏,陈江,张海燕,姚玉鑫.南太湖区域表层沉积物中有机氯化合物及重金属污染现状.湖泊科学,2011,23(4):561-567. DOI:10.18307/2011.0411
CAO Yuan,QIU Yanling,YANG Xiaohong,LI Li,ZHU Zhiliang,ZHAO Jianfu,CHENG Binghong,CHEN Jiang,ZHANG Haiyan,YAO Yuxin.Pollution status of organochlorines and heavy metals in surface sediment of southern Lake Taihu. J. Lake Sci.2011,23(4):561-567. DOI:10.18307/2011.0411
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南太湖区域表层沉积物中有机氯化合物及重金属污染现状
曹源1,2, 仇雁翎1,2, 杨晓红3, 李力1,2, 朱志良1,2, 赵建夫1,2, 程炳宏1,2, 陈江3, 张海燕3, 姚玉鑫3
1.同济大学环境科学与工程学院长江水环境教育部重点实验室, 上海 200092;2.同济大学环境科学与工程学院污染控制与资源化研究国家重点实验室, 上海 200092;3.浙江省湖州市环境保护监测中心站, 湖州 313000
摘要:
对南太湖水域表层沉积物中的19种有机氯化合物及6种重金属的含量、分布及其生态风险进行了研究和评价.所测样品中有机氯农药(OCPs)和多氯联苯(PCBs)含量范围分别为0.51-4.98、1.49-15.15ng/g(dw), 与国内其它水域沉积物中OCPs、PCBs的含量相比处于较低水平.OCPs中的主要污染物是α-六六六, PCBs中含量最高的是八氯联苯CB194和三氯联苯CB28.所采沉积物样品中6种重金属的含量水平分别为Cu:14.4-79.7mg/kg、Zn:69.3-214mg/kg、Cr:65.0-99.5mg/kg、Ni:24.8-48.7mg/kg、Pb:12.3-39.2mg/kg及Cd:0.015-0.563mg/kg.用风险评估低值(ERL)和风险评估中值(ERM)对有机氯化合物进行了生态风险效应评价, 发现所测沉积物中滴滴涕(DDTs)的值90%处于ERL值以下, γ-六六六与PCBs的值100%小于ERL.利用潜在生态危害指数法对研究区沉积物进行生态危害评价, 结果表明, 沉积物中重金属的生态危害程度都较小, 单项生态危害指数相对较高的重金属是Cd, 各采样点中XMK-0重金属的潜在生态危害相对较高.总体而言, 南太湖表层沉积物中上述有机氯化合物和重金属的含量水平较低, 未对生态构成严重威胁.但考虑到这两类污染物的生物积累性和毒性, 仍需注意预防此类污染。
关键词:  南太湖  沉积物  有机氯化合物  重金属  风险评价
DOI:10.18307/2011.0411
分类号:
基金项目:国家水体污染控制与治理科技重大专项项目(2008ZX07421-002);污染控制与资源化研究国家重点实验室自主研究课题项目(PCRRY09009)联合资助
Pollution status of organochlorines and heavy metals in surface sediment of southern Lake Taihu
CAO Yuan1,2, QIU Yanling1,2, YANG Xiaohong3, LI Li1,2, ZHU Zhiliang1,2, ZHAO Jianfu1,2, CHENG Binghong1,2, CHEN Jiang3, ZHANG Haiyan3, YAO Yuxin3
1.Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, P.R.China;2.State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, P.R.China;3.Huzhou Environmental Monitoring Center, Huzhou 313000, P.R.China
Abstract:
Concentration and distribution of 19 organochlorines and 6 heavy metals in the surface sediment of southern Lake Taihu were studied and the relevant risk assessment was carried out.The results showed the concentrations of organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) detected ranged from 0.51-4.98ng/g(dw) and 1.49-15.15ng/g(dw),respec-tively,which was at a low contamination level compared to other fresh water sediments in China.The congener of α-hexachlorocy-clohexane (α-HCH) was the dominant pollutant among OCPs and CB194,and CB28 were the dominant PCBs.The concentration rangesof Cu,Zn,Cr,Ni,Pb and Cd in the surface sediments of southern Lake Taihu were 14.4-79.7mg/kg,69.3-214mg/kg,65.0-99.5mg/kg,24.8-48.7mg/kg,12.3-39.2mg/kg and 0.015-0.563mg/kg,respectively.Effects range low (ERL) and effects range median (ERM) were used to evaluate the ecological risk of organochlorines.It was found that 90% of the sampling sites had a dichlorodiphenyltrichloroethanes (DDTs) value lower than the ERL,and the γ-HCH and PCBs values of all sites were lower than the ERL.The risk assessment was completed on heavy metals in sediments by using the potential ecological risk index (RI).The results indicated that the overall ecological risk caused by heavy metals was low.The potential ecological risk index of Cd was relatively higher,and the RIs of several heavy metals in XMK-0 were relatively higher than that in other sites.Al-though the concentration levels of the above organochlroine and heavy metal pollutants in the surface sediments of southern Lake Taihu were low and no serious threat has been observed to the ecological system,the prevention to these contaminations should not be ignored for their accumulative effect and toxicity in the environment.
Key words:  Southern Lake Taihu  sediment  organochlorines  heavy metal  risk assessment
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