太湖梅梁湾沉积物和水生生物中有机氯农药分布特征及风险评估

第45卷第2期2015年3月东南大学学报(自然科学版)JOURNALOFSOUTHEASTUNIVERSITY(NaturalScienceEdition)Vo1．45NO．2Mar．20l5doi：10．3969~．issn．1001—0505．2015．02．023太湖梅梁湾沉积物和水生生物中有机氯农药分布特征及风险评估许妍周亚子陈曦缪蜀江林汉华秦庆东(东南大学土木工程学院，南京210096)(香港城市大学生物与化学系，香港999077)摘要：根据太湖梅梁湾有机氯农药(OCPs)污染情况，采用GC／ECD分析了梅梁湾沉积物，并对4种鱼及螺狮为代表的水生生物中有机氯农药的残留现状进行了风险评估．结果表明：沉积物(干重)中OCPs浓度范围在8．45～48．54ng／g之间，生物样品(湿重)中的浓度范围在2．68～31．34ng／g之间．人类食用OCPs污染的水产品的潜在健康风险评估显示，从非致癌风险角度滴滴涕(DDTs)、六氯苯(HCB)、氯丹(CHL)和七氯环氧的危险商R。均小于1；从致癌风险角度，除CHL外，DDTs、HCB、六六六(HCHs)、七氯环氧的危险比尺均大于1，长期癌症风险不容忽视．根据淡水沉积物质量导则标准估算，太湖梅梁湾沉积物中OCPs残留对水生生态系统的影响较小．关键词：有机氯农药；沉积物；水生生物；风险评估中图分类号：X835文献标志码：A文章编号：1001—0505(2015)02-0328-08ChemicalcharacterizationandriskassessmentoforganochlorinepesticidesinsedimentsandbiotafromMeiliangBayofTaihuLakeXuYan·ZhouYaziChenXiMiaoShujiangLamMichaelHonwahQinQingdong(SchoolofCivilEngineering，SoutheastUniversity，Nanjing210096，China)(。DepartmentofBiologyandChemistry，CityUniversityofHongKong，HongKong999077，China)Abstract：Tobetterunderstandtheorganochlorinepesticides(0CPs)contaminationinMeiliangBay，TaihuLake(China)，levelsofOCPsweremeasuredinthesediment。andthefourspeciesoffishesandBellamyaquadrata(Benson)usingGC／ECD．TheresultsshowthattheconcentrationsofOCPswerefoundtorangefrom8．45to48．54ng／gDW(dryweight)insediments，andfrom2．68to31．34ng／gWW(wetweight)inbiotatissues．Potentialhumanhealthriskassessmentassociatedwiththeaboveorganochlorinecontaminantsduetotheconsumptionofcontaminatedaquaticproductswasconducted．ThehazardquotientsRHoofDDTs，hexachlorobenzene(HCB)，chlordane(CHL)andheptachlorepoxidewereallbelowunitybasedonnon．cancerendpoints，whilethecancerhazardratios尺HRofDDTs，HCB，HCHsandheptachlorepoxideweresignificantlyhigherthan1exceptCHL’S．Therefore．thelong。termcancerriskcausedbVDDTs，HCB，HC：Hsandheptachlorepoxideisofgreatconcern．Basedonrelativefreshwatersedimentqualityguidelines．thecontaminationslcadtolimitedadverseeffectsonthelocalaquaticsystem．Keywords：organochlorinepesticides；sediment；biota；riskassessment有机氯农药(organochlorinepesticides，OCPs)是典型的持久性有机污染物，其中艾式剂(a