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引用本文:许妍,陈佳枫,徐磊,刘雨薇,谢立莹,王之卓,金苗,陈宇炜.白洋淀表层沉积物中有机氯农药和全多氯联苯的分布特征及风险评估.湖泊科学,2020,32(3):654-664. DOI:10.18307/2020.0306
XU Yan,CHEN Jiafeng,XU Lei,LIU Yuwei,XIE Liying,WANG Zhizhuo,JIN Miao,CHEN Yuwei.Distribution and risk assessment of organochlorine pesticides and polychlorinated biphenyls in surficial sediments from Lake Baiyangdian. J. Lake Sci.2020,32(3):654-664. DOI:10.18307/2020.0306
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白洋淀表层沉积物中有机氯农药和全多氯联苯的分布特征及风险评估
许妍1, 陈佳枫1, 徐磊1, 刘雨薇1, 谢立莹2, 王之卓1, 金苗3, 陈宇炜4
1.东南大学土木工程学院, 南京 210096;2.辽宁省兴城市环境保护监测站, 兴城 125100;3.中国科学院南京地理与湖泊研究所, 南京 210008;4.南昌工程学院, 南昌 330099
摘要:
为了解白洋淀表层沉积物中有机氯农药(OCPs)和多氯联苯(PCBs)的污染情况,采用改进的GC-μECD方法对白洋淀11处沉积物进行了20种OCPs和全部209种PCB单体的定量检测和分析.结果显示:白洋淀11个沉积物样品共检出10种OCPs和24种PCBs,∑OCPs和∑PCBs的含量范围分别为1.22~52.45 ng/g(DW)和nd ~37.61 ng/g,在国内处于中等水平;OCPs组成中以HCHs和Dieldrin(狄氏剂)为主,分别占到∑OCPs的39.9%和31.5%,其中7个采样点的HCHs以林丹输入为主,4个采样点以工业六六六污染为主.DDTs检出率较低,来源主要为历史残留;检出的PCB单体以低氯联苯为主,其中一氯、二氯和三氯联苯占∑PCBs的64.73%;采用沉积物质量标准法进行生态风险评估,结果表明白洋淀地区沉积物中p,p'-DDD和∑PCBs生态风险较低,Dieldrin生态风险尚需关注,γ-HCH生态风险较高,不容忽视.
关键词:  白洋淀  沉积物  多氯联苯  有机氯农药  风险评估
DOI:10.18307/2020.0306
分类号:
基金项目:国家自然科学基金项目(41671468,41301546,51408119)、江苏省自然科学基金项目(BK20171356)和江苏省青蓝工程和污染控制与资源化国家重点实验室开放基金项目(PCRRF16018)联合资助.
Distribution and risk assessment of organochlorine pesticides and polychlorinated biphenyls in surficial sediments from Lake Baiyangdian
XU Yan1, CHEN Jiafeng1, XU Lei1, LIU Yuwei1, XIE Liying2, WANG Zhizhuo1, JIN Miao3, CHEN Yuwei4
1.School of Civil Engineering, Southeast University, Nanjing 210096, P. R. China;2.Environmental Protection Monitoring Station of Xingcheng City, Liaoning Province, Xingcheng 125100, P. R. China;3.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;4.Nanchang Institute of Technology, Nanchang 330099, P. R. China
Abstract:
To better understand the contamination of organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) in sediments from Lake Baiyangdian, 20 OCPs and all 209 PCB congeners were measured in 11 surficial sediment samples collected from different locations of Lake Baiyangdian. Moreover, the risks posed by OCPs and PCBs were assessed based on sediment quality guidelines. The results show that 10 OCPs and 24 PCB congeners were detectable. The total OCPs concentrations ranged from 1.22 to 52.45 ng/g(DW) (dry weight), while the total PCBs levels were from below detection limit to 37.61 ng/g. These results indicate a moderate pollution level within China. HCHs and Dieldrin were predominant in all OCPs, which accounted for 39.9% and 31.5% of total OCPs, respectively. Seven sampling sites of Lake Baiyangdian were contaminated by Lindane (γ-HCH) and the other 4 sampling sites were mainly contaminated by industrial HCHs. Moreover, new HCHs inputs might exist in some locations. DDTs levels were relatively low, which suggests that DDTs in Lake Baiyangdian might be the historical residues. PCBs detected in these sediment samples were dominated by low chlorinated PCBs congeners. Mono-, di-and tri-chlorinated biphenyls accounted for 64.73% of the total PCBs. However, it is noted that some new organochlorine pesticide pollution of HCHs may be present in some areas. Ecological risk assessment based on sediment quality guidelines revealed that the risks posed by p,p'-DDD and ∑PCBs were relatively lower, while the risk associated with Dieldrin was of concern. Notably, γ-HCH posed apparent adverse effects on the local ecological system.
Key words:  Lake Baiyangdian  sediments  polychlorinated biphenyls  organochlorine pesticides  risk assessment
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