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《名山河流域水稻土微團(tuán)聚體對hg22b吸附—解吸特性-研究》由會員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在教育資源-天天文庫。
1、萬方數(shù)據(jù)AbstractThestudywasengagedinallinvestigationandanalysisoftheeffectsofpaddyfieldsoilcomponentsontheadsorptionanddesorptionofmercurybymicro—aggregatesalongtheMingshanRiverwatershed。Theoreticallyspeaking，wehadalreadymadeclearthatheavymetalcontaminants，suchaSH92+，canstronglyaffectthemigrationofsuchh
2、eavymetalpollutantsintheenvironmentinthegroundwater,theorganismsandcropsinthewatershed．Therefore，inproceedingwithourstudy,wehadcollecteddifferent-sizedmicro—aggregatessamplesandseparatedthembywetsieving--siphonsedimentation—-freezedryingmethodfromthepaddyfieldsinthesaidwatershed．Furthermore，wehaduse
3、dtheisothermaladsorptionmethod，batchmethodandNaN03andHCldesorptionmethodfortracingtheactualkineticandthermodynamicsofmercuryadsorptionanddesorptionviathemicro—aggregates．And，next，wehadderivedthemicro—aggregatessampleswithoutorganicmatters(OM)andfreeironoxides(Fed)respectivelywiththehelpofselectivedi
4、ssolutioninhopingtodisclosetheeffectsofOMandFedinthepaddysoilcomponentsonthemercuryadsorptionanddesorptionTheresultswereaSfollows：ng：+adsorbanceofthebulksoilandmicro—aggregatestendedtoincreasewiththeincreaseofequilibriumconcentration，whichWasinsignificantlypositivecorrelationwiththecationexchangecap
5、acity(CEC)，OMandFed僻L0．9746_0．9836)．Moreover,theH92+adsorptionisothermsturnedoutwellinaccordwiththeLangmuirequations，nevertheless，thedistributioncoefficient(‰)turnedoutinnegativecorrelation慚ththeinitialconcentrationofH92+．Ontheotherhand，thougIlafterremovingOMandFedfromthesoil，theH92+adsorbanceintheb
6、ulksoilandmicro-aggregatestendedtogetdecreased，thereexistedasignificantlypositivecorrelationwimtheresidualOMandFed．SuchafactindicatesthatthecontributionsofOMandFedremovaltothedecreaSeofadsorbanceturnouttovaryamongthedifferentmicro—aggregatesoftheparticlesizes，、)l，imequivalentcontribution(30％)in0．053
7、4)．25mmmicro—aggregatessamplesand10一foldmoreofFedthanOMin<0．002mmmicro—aggregatessamples．Therefore，thedesorptionstudyindicatedthatthedesorptionrateturnedtoincreasewiththeadsorbaneeofHg“．Insuchasituati
