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时间:2020-03-25
《天津郊区土壤与作物中有机氯农药残留现状与来源初析.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、农业环境科学学报2010,29(12):2346-2350JournalofAgro-EnvironmentScience天津郊区土壤与作物中有机氯农药残留现状与来源初析张泉,楚蕾,曹军(北京大学城市与环境学院,北京100871)摘要:通过在天津塘沽和宁河地区野外实地采样分析,了解研究区域有机氯农药各异构体在土壤及作物各部位的残留水平,并通过特征比值推测其来源。结果表明,塘沽和宁河地区土壤中六六六的残留浓度均值分别为88.76P,g·kg-‘与98.46心·kg一,p—HCH占绝对优势而,y-HCH均未在土壤样品中检出,a—HCH手性
2、分析结果显示为非消旋体,均表明土壤中六六六来自历史残留而非新近输入或林丹的使用。塘沽和宁河地区滴滴涕的残留浓度均值分别为30.87¨g-kg.I与1.30斗g·kg.1,亦来自历史残留,在个别点位可能曾使用过i氯杀螨醇。作物样品中六六六与滴滴涕的含量较高,经对数变换的生物富集系数变化范嗣分别为O.24~0.73与2.02—2.90。六氯苯、七氯、艾氏剂、异艾氏剂、反式氯丹、顺式氯丹、狄氏剂与异狄氏剂在大部分土壤与作物样品中也有不同程度的检出。关键词:土壤;作物;有机氯农药;对映体比值中图分类号:X592文献标志码:A文章编号:1672
3、—2043(2010)12—2346--05ResidualLevelsandChiralSignaturesofOrganochlorinePesticidesinSoilandPlantsinTianjin,ChinaZHANGQuan,CHULei,CAOJun(CollegeofUrbanandEnvironmentalSciences,PekingUniversity,Beijing100871,China)Abstract:Residuallevelandenantiomericcompositionoforganochl
4、orinepesticides(OCPs),includingHexachlorobenzene,Heptachlor,Aldrin,lsodrin,trans—chlordane.cis—Chlordane,Dieldrin,Endrin,Dichlorodiphenyltrichloroethane(DlYl')andHexachlorocyclohexane(HCH)insoilandplantsamplesfromTangguandNingheinTianjin,ChinawereanalyzedbyGC/ECD.Theres
5、ultsshowedmostoftheOCP,weredetectableinthesesamples.Meanlevelsof∑HCHsinsoilwere88.76Izg·kg—inTangguand98.46p.g·kg—inNinghe,respectively.ThecompositionofJ3-HCHWaSinstronOydominated,accountingfor91.9%-99.9%ofHCHs,and1一HCHwasundetectedinsoilsamples,whichsuggestedthatsouseo
6、fHCHsw船fromhistoricresiduebutnotrecentinputoftechnicalHCHsorlindane.Averageconcentrationsof∑DDlrsinsoilwere30.87lag·kg-1inTangguand1.30峙·kg—inNinghe.MetabolitesofDDT(DDE+DDD)accountedmorethan50%inallthesamplesandtheratioofo,P’-DDTandP,P7-DDTwashigherthanthatintechnicalD
7、DTsinsamplesfromTanggu,whichimpliedthattheresidueofDDTsoriginatedfromhistoricalusageofbothdicofol—typeDDTandtechnicalDDTmtherthannewinput.Besidesisomerratios,enantiomerratio(ER)ofchiralcompoundscouldalsoprovidehelpfulinformationaboutwhetheritWSSbeingcurrentlyappliedorre
8、siduefrompastapplication.朋=lmeanednewinputofparentchiralcompound.andnometabolismhadoccurred.d—HCHdisplayedthen
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