多环芳烃在土壤中的老化和迁移行为.研究

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1、摘要AbstractInordertounderstandthefateandbehaviorofagingandtransportingofPAHsinsoil，severalexperimentsweredesignedinthisstudy．ThepollutionstatusandsourcesofPAHsinagriculturalsurfacesoilsofFuzhouCitywereinvestigated．Agingofspikedphenanthrene(Phe)andpyrene(Pyr)inpaddysoilandthedistributionsofPheandPyri

2、ndifferentparticle-sizefractionsofsoilwerestudied．VerticaltransportofPheandPyrunderfloodedconditionswasinvestigatedbysimulationsexperimentsinsoilcolumns．Thefollowingarethemainresultsinthisstudy．(1)Thecontentsof16USEPApriorityPAHsinagriculturalsurfacesoils(0—10cm)werestudied，andthesourcesandecologic

3、alrisksofPAHswerealsoanalyzed．Resultsdemonstratedthat16PAHsweredetectedinallsoilsamples．Theconcentrationsofthesumof16PAHsinagriculturalsoilsrangedfrom100．2Pg‘k矿1to1215．1／tg‘k百1．ThemainsourcesofPAHsinagriculturalsoilswerefrompetroleumandbiomassburning．Toxicityequivalencyfactor(TEE)wasusedtoconvertth

4、etoxicityvalueofindividualPAHstoanequivalenttoxicityvalueofbenzo[a]pyrene(Bapeq)．TotalBapeqvaluesoftheagriculturalsoilsrangedfrom2．50／zg。k91to147．95／*g‘k91andhalfofthemweregreaterthanDutchtargetvalue(totalBapcq=32．96／tg‘k百1)．Theresultsinthisstudydemonstratedthat，tosomeextent，someareasofagricultural

5、soilsinFuzhoucityhadpotentiallyecologicalrisks．(2)AgingofspikedPheandPyrinpaddysoilandthedistributionscharacteristicsofPheandPyrindifferentparticle-sizefractions(clay,finesilt，coarsesilt，finesandandcoarsesand)ofsoilwerestudied．TheresultsshowedthattherelativeextractabilityofPheandPyrweregraduallyred

6、ucedwithagingtime．After90-dayaging，thepercentageoftheamountofPheindifferentparticle-sizeseparatetothetotalamountofPheinbulksoilsdecreasedintheorderoffinesand>coarsesand>finesilt>coarsesilt>clay．ThepercentageoftheamountofPyrindifferentparticle—sizeseparatestothetotalamountofPyrinbulksoilsdecreasedin

7、theorderoffinesilt>finesand>coarsesilt>clay>coarsesand．(3)VerticaltransportofPheandPyrunderfloodedconditionswasinvestigatedbysimulationsexperiments．Theresultsshowedthatultrapurewater(DOe，0mg’kg咀)，祸建师范大学硕士学位