涕灭威-SDBS复合污染体系在土壤多介质环境中的行为及模型的研究

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1、AbstractAsapartofintegratedpl’ogramnamedTheEnvironmentalChemicalBehaviorofChemicalPollutantsinMultimediaandMulti—interracialEnvironmentalSystemandsupportedbyNationalNaturalScienceFoundationofChina，thispaperdealtwiththebehaviorofacomplexpollutionsystemcomposedofaverytoxiccarbamat

2、epesticide，aldicarb，andawidelyusedanionicsurfactant，sodiumdodecylbenzenesulfonate(SDBS)，insoilmultimediaenvironment．111eresearchfocusedontheeffectofSDBSontheenvironmentalbehaviorofaldicarb．Thefollowingexperimentalstudieswereconductedinthispaper：r1)ThesolubilizationofaldicarbinSD

3、BSaqueoussolution．1twasfonndthatdespitejtsmoderatesolubilityandpolarityaldicarbwasmoresolubleinSDBSsolutionthaninpurewater．WiththeincreaseoftheconcentrationofSDBSthesolubilityofaldicarbincreasedandreachedthemaximumvalueatthecritiealmicelleconcentration(CMC、．(2)Thesorptionofcompl

4、expollutionsysterninsoil．Theresultsshowedthat：filThesorptionofaldicarbcouldbefittedbyFreundlichorIinearisothermandhadadeviationfromlineariSOthermatlOWconcentration；fiilSDBScandecreasethesorptionofaldicarbwhilealdicarbhadnoobservedinfluenceonthesorptionofSDBSinexperimentalconcent

5、rationrange；(iii)AfractionoftotalSOrbedaldicarbwasboundwithsoilirreversiblyandthemaximumirreversiblecapacitywas150ug／gorso；(iv)Thesorptionofaldicarbinsoilhadtwokindsofmechanism；soliddissolutionandchemicalsorptiononorinspecificsitesinsoilorganicmatter,especiallyinhumicacid；andfvl

6、Hydrogenbindbetweenaldicarbmolecularandcarbonylgroupofhumicacidwasimportanttosorption．(3)TheinfluenceofSDBSonleachingofaldicarbinsoil．ItwasfoundthatSDBScallacceleratethedownwardmovementofaldicarbandwhentheconcentrationofSDBSincreasedfrom250mg／kgto500mg／kgtheleachingdepthofaldica

7、rbhadanincreaseof20cm．(4)孙eeffectofSDBSonthedegradationofaldicarbinsoil．TheexperimentalresultsindicatedthatSDBScouldincreasethedegradationrateandthefirst．ordorreactionrateconstantwaspositivelyrclatedtothelogarithmofconcentrationofSDBS．InordertoevaluatetheriskofgroundwaterCOntami

8、nationresultingfrompesticideleaching．anewfugaci