毒死蜱在沉积物中的环境行为分析

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1、AbstractChlorpyrifoswhichisalleffective，lowtoxicandwidelvusedorganophosphorouspesticidehassubstitutedhightoxicpesticide，suchasmethamidophos，parathionandSOon．Recently,chlorpyrifosisrecognizedasapotentialpollutionsource，soenvironmentpollutionandhumanhealthriskareconcemedbyresearchers．Chlorpyrif

2、osinwaterwaseasilyadsorbedinsediments，butitWasdesorbedinsomecaseandcausedthesecondpollutioninthewarerenvironment；Furthermore，anaerobicenvironmentandreductiveconditions、verewidelydistributeinsediments，thesefactorswouldaffectedthetransportandtransformationprocessesofchlorpyrifosinwater．Soitisne

3、cessarytostudythesorptionbehaviorinsedimentsandthedegradationunderdifferentreductiveconditions．Inordertoevaluatetheenvironmentalbehaviorofchlorpyrifos，theinfluenceofdifferentenvironmentalfactorsforadsorptionwerestudied，Moreover-degradationofchlorpyrifosunderaerobicandanaerobicconditionswereal

4、sostudied，andtheinfluenceofdifferentreductiveconditionsandorganicmatterwerefurtherinvestigated．Themainconclusionsobtainedarelistedasfollows：Theadsorptionbehaviorofchlorpyrifosonthesedimentunderdifferentconditionswerestudied，theresultsshowedthattherapidsorptionplayedthemainroleinthesorptionofc

5、hlorpyrifosandLinearmodelcoulddescribedthesorptionisotherms．Whentemperaturerangedfrom15℃to30℃，theadsorptionofchlorpyrifosWaslargestat15℃，andleastat25℃．Theadsorptionofchlorpyrifosdecresed淅ththecontentsofsedimentincreased．TheeffectofCa2+concentrationhasnosignificantinfluenceonthesorptionatlowch

6、lorpyrifosconcentrations；however,theC扩concentrationwasallenhancedtheadsorptionwithhigherchlorpyrifosconcentrations．Thedifferentbivalentcationresultindifferentofchlorpyrifossorption，whenthechlorpyrifosconcentrationswerehigher,M92+significantlydecreasedtheadsorption(萨O．05)，theeffectofZn2+Wasnot

7、significant．comparedwithhigherchlorpyrifosconcentrations，theeffectofbivalentcationisnegligibletothesorptionatlowerchlorpyrifosconcentrations．W11enatthehigherconcentrationsofchlorpyrifos，Na+enhancedtheadsorptionp