p,p-DDT在黄河兰州段沉积物上的吸附∕解吸特性及影响因素研究.pdf

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1、农业环境科学学报2010，29(1)：174—179JournalofAgro—EnvironmentScienceP，p，-DDT及影响因素研究杨志群，姚焕炬，任婷，成刚，高宏(兰州大学资源环境学院西部环境教育部重点实验室，甘肃兰州730000)摘要：采用批量平衡实验，研究了黄河兰州段沉积物对P,P7一DDT的吸附／解吸特性，并考察了环境因素温度、pH值、沉积物粒度等对吸附的影响。结果表明，P,P7一DDT在黄河兰州段沉积物上的吸附在24h内可以充分达到平衡。吸附过程是非线性的，Freundl

2、ich模型可以较好地描述吸附行为，分配作用和表面吸附作用同时存在；解吸过程存在明显滞后性，即解吸要比吸附困难。正交结果表明吸附质浓度和吸附剂浓度对P,P7一DDT在沉积物上的吸附量有显著影响，而温度、pH值、有机质含量、沉积物粒度影响不显著。关键词：黄河；沉积物；p，P7一DDT；吸附；影响因素中图分类号：X592文献标志码：A文章编号：1672—2043(2010)01—0174—06CharacteristicsandEa'ectFactorsfortheSorptionandDesorpt

3、ionofp，p7一DDTonSedimentoftheYellowIUV—erinLanzhouYANGZhi-qun，YAOHuan-ju，RENTing，CHENGGang，GAOHong(CollegeofResourceandEnvironment，LanzhouUniversity，KeyLaboratoryofWesternChina’SEnvironmentalSystemsofMinistryofEdu-cation，LanzhouUniversity，Lanzhou73000

4、0，China)Abstract：Tostudythecharacteristicsofsorptionanddesorptionissignificantlyfortheenvironmentalbehaviorandfateofhydrophobicor-ganiccontaminants．Inthispaper，thebatchisothermexperimentswereperformedtostudythecharacteristicsandeffectfactorsforthesor

5、p-tionanddesorptionofP,P7-DDTonsedimentoftheYellowRiverinLanzhou．TheeffectofenvironmentalfactorsonthesorptionofP,P7-DDTsuchaswatertemperature，pHvalue，particlesizesinsedimentswereinvestigated，respectively．Experimentalresultsdemonstratedthatthesorption

6、ofP,P7-DDTinthesedimentsoftheYellowRiverinLanzhoucouldbecompletelybalancedin24h．Thesorptionisothermwasnon-linearandfittedwiththeformoftheFreundlichequationatexperimentalcondition，whichsuggestedthatbothadsorptionandpartitionOC--cu=edinthesorptionproce

7、ssofP,P7-DDTatthesametime．ThedesorptionprocessofP,P7-DDThadanobvioushysteresis．anditwasdiffi—cultfordesorptionthansorption．Furthermore，theaffecteddegreesofdifferentenvironmentalfactorsweredifferentforthesorption．Theresultoforthogonalexperimentindicat

8、edthatthesorptionamountofP,P7-DDTwasinfluencedbytheinitialconcentrationsofsorbateandsorbentobviously，sorptionamountofP,P7-DDTexhibitedanincreasedtrendwiththeinitialconcentrationofsorbateanddecreasedtrendwiththe●n●●，．●^^^1-一一nconcentratlonotsorbent。bu