土壤中有机氯农药分布及食品中酸性农药回收率的研究

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1、中国农业大学博士学位论文土壤中有机氯农药分布及食品中酸性农药回收率的研究姓名：张红艳申请学位级别：博士专业：农药学指导教师：江树人20060501AbstractPesticidesareconsideredtobethemostimportantcontaminantsinsoilsandfoods．Pesticidesincontaminatedsoilscouldbebioaccumulatedthroughcropsandthentofffectthehumanhealththroughthefood-chain．Soitwillbesignifica

2、nttostudythepesticidesdistributioninsoilsandtomonitorthepesticideresiduesinfoods．Thespatialvariationcharacteristicsof1,2，3，4，5，6-hexachlorocyclohexanefilCH)，1,1，1·trichloro-2，2‘bis(p-chlorophenyl)ethane(DDT)andtheirisomersandmetabolitesconcentrationinsurfacesoilsoffarmlandwerestudie

3、d，basedonthesurveyof131samplingpointsofBeijingplainareainthisstudy．Datawereanalyzedwiththetraditionstatisticalanalysismethod，thegeo-statisilcalanalysiswithsemivariogramstructureandmodelfitting，theOrdinaryKrigingandtheInverseDistanceWeightingMethod．Thetraditionstatisticalanalysisindi

4、catedthat,soilresiduesoftotalHCH，totalDDTandtheirisomersandmetaboliteswemlognormaldis啊bu怕n，thecoefficientsofthevailationofalltheobservingitemsbelongedtothestrongdegree．Accordingtothegeo-statisticalanalysiswithsemivariogramstructumandmodelfitting,thesoilremduesof?-HCH，b-HCHandthetota

5、lHCHhadnotthespatialvariationstructure，whileotllerisomers，metabolitesandtotalDDThadspacevariationstructureandvariancesmayfittheexponentialmodelortheGaussianmodel，separately．Thevariationrangesofa—HCH，thetotalDDTanditsisomerswemlargerthanl舭：ln，whichisrelativelyhighercomparingto2．73kmf

6、orB-HCH．TheⅡendanalysisindicatedalltheDDTisomers，metabdiitesandthetotalDDThadtheobvioustendencyeffect．ButforHCH，onlyisomersIj-HCaand7-HCHhadtheslighttendencyeffect．ThecontourmapsoforganochlorinepesticideresidueswereobtainedusingtheOrdinaryKrigingandtheInverseDistanceWeightingMethod．

7、Basedonthosemaps，thespatialdistributionoforganochlorinepesticideresidueswasanalyzed．TheresultsindicatedthatHCHconcentrationinall131soilsamplesandDDTconcentrationin8S％ofsoilsampleswerelowerthan0．05mg-kg-1，gettingthefirstlevelofChina⋯sSoilEnvironmentQualityStandard”(GBl5618-1995)．TheO

8、rganochlorinePestic