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时间:2018-07-17
《硕士论文-中空纤维膜液相微萃取技术分析水中有机污染物研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、苏州科技学院硕士学位论文中空纤维膜液相微萃取技术分析水中有机污染物研究姓名:李冠华申请学位级别:硕士专业:环境工程指导教师:张占恩20080501MasterDissertationofSuzhouUniversityofScienceandTechnologyAbstractAbstractInthepastfewyears,asimpleandvirtuallysolventfreemethodknownasliquid-phasemicroextraction(LPME)hasemergeddramaticallya
2、sallalternativesamplepreparationtechnique.ThisnoveltechniqueovercomesafewdisadvantagesofconventionalSamplepreparationtechniques,such勰time—consuming,labor-intensiveandrequiringlargeamountsoftoxicorganicsolventswhichmayresultinsecondaryenvironmentalpollution.TheLPME
3、combinesextraction,concentrationandsampleintroductioninasinglestepandisasimple,cheap_,sensitiveandenvironmentalfriendlysamplepreparationtechnique.EspeciallyinthethehollowfiberLPME,sinceorganic.phaseisprotectedbythehollowfiber,thestabilityofthesolvent“drop'’isgreat
4、lyimproved,andhigherstirringratescanbeusedtoreducetheequilibriumtimeandextractiontime.Asaresult,betterextractionefficiencyandsensitivityareachieved.Moreover,thehollowfiberCanalsopreventfromtheinterferencescausedbylargemoleculesorsuspendedsolidparticlesinsamplesolu
5、tions.Atpresent,theLPMEtechniquehasbeenwidelyappliedinvariousfields,suchasorganicpollutantsinenvironmentanalysis,biology,detectionoffood,etc.However,thereareveryfewrelevantreportsabouttheapplicationofLPMEinourcountry.Thispaperstudiesthefollowings:’1.Theapplication
6、ofdynamichollowfiberliquid—phasemicroextraction(dynamicHF.LPME)combined、杭nlgaschromatography—massspectrometry(OC-MS)forthedeterminationoftraceamountsofpolychlorinated-biphenyls(PCBs)inwaterwasstudied.Theextractionefficienciesinthreedifferentliquid-phasemicroextrac
7、tion(LPME)modes(staticdirect-immersedLPME,staticHF-LPMEanddynamicI-IF・・LPME)wereinvestigatedanddynamicHF・・LPMEWasfinallyselectedforpresentpurpose.TheexperimentalparametersthataffecttheextractionefficiencyofdynamicHF—LPME,suchasorganicsolventselection,solventvolume
8、,extractiontime,dwellingtime,extractiontemperature,stirringrateandsaltcontentwereoptimized..Undertheoptimumconditions,theconcentrationenrichmentfactorsf
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