活性碳埋藏剂ActiveCarbon-impregnatedSilicaGelGrade:forDioxinAnalysisStoragecondition:KeepatRT.规格：10gSummaryThisproductisforresearchuseonly.Donotadministerittohuman.Applicabletopretreatment(cleanup)indioxinanalysis!ActiveCarbon-impregnatedSilicaGelisacolumnclean-upfillerdevelopedformicroanalysisofpolychlorodibenzo-p-dioxin(PCDDs)andpolychlorodibenzofuran(PCDFs).Attaininghighmicroanalysisprecisionrequiresexcellentclean-upmethod.Asdioxinsareparticularlyhighintoxicity,theverycauseofsocialconcern,itisamusttosecurehighreliabilityinitsanalysisvalue.Activecarbonhasacharacteristicofspecificallyadsorbingcompoundswithflatboardstructures,suchasdioxin.Itisgainingaglobal-widerecognitionthatactivecarbonclean-upprocessisanessentialrequirementinrefiningdioxins.However,conventionalactivecarbonhadsuchweaknessesaslowpenetrabilitywhenusedasfineparticlesandpoortailingatelutionwhentheparticleislarge.Thisnewtypeofcolumnchromatographyfiller,madebyimpregnatingfine-grainactivecarbonintosilicagel,notonlyhastheexcellentcharacteristicsofactivecarbonbutalsohasgoodpenetrability.[Operatingprocedure]Layglasswoolatthebottomofchromatographytubeattachedwithastopcockandplaceinanhydroussodiumsulphateattheheightofabout1cm.Thenplacein1gofactivecarbonimpregnatedsilicagelandlightlyshakethecolumntofixitsthickness.Againplaceinanotherlayerofanhydroussodiumsulphateontopataheightofabout0.5cm.(Refertotheequipmentdrawing.)Whencolumnsettingiscomplete,immediatelyletthespecimenflowdowngently(hexanesolutionconcentratedtoabout0.3mLisdesirable)ontotheanhydroussodiumsulphatelayer,usingapipette.Thenwashoffthetubewallandanhydroussodiumsulphatelayerafewtimeswith0.1mLofhexane.Afterle***ingatrestforafewminutes,connectaseparatoryfunnelcontaining200mLof25%***ane/hexane[v/v]mixturetotheupperpartofchromatographytubeandgentlyletthemixtureflowdownsospreadingstartsattheflowrateof1droppersecond.(Thiseffluentdoesnotcontaindioxin.)Whenthe***ane/hexanemixtureisexhausted,continueperformingelutionusing200mLoftolueneattheflowrateof1droppersecond.(Thiseffluentcontainsdioxin.)ConcentratethetolueneeffluenttothetargetvolumeusingpressurereducingKDconcentrator.[Note]PCBsarecompletelyelutedinthe25%***ane/hexaneeffluentreadytobesuppliedforquantitativeanalysis.Duetothedrytypecolumnchromatography,bubblesremaininthecolumnduringtheelutionprocess.Howevernoadverseeffectisseenintherecoverypercentageandreproducibility.Therecoverypercentageismorethan90%withloadsof1ngforeach1,2,3,4-T4CDDandO8CDD.T4CDD:Tetrachlorodibenzo-p-dioxinO8CDD:Octachlorodibenzo-p-dioxin1)[Reference]Ono,M.,Wakimoto,T.,Tatsukawa,R.andMasuda,Y.:Chemosphere,15,1629(1986).~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~如有更多其它***产品需求与查询,请及时接洽：info@express-cn.com或在我公司查询主页客户留言处（http://www.express-cn.com/expressgb/m）留下您的查询内容，我们即会在当天为您作出回复。伊普瑞斯科技有限公司info@express-cn.com总机：010-60206266传真：010-60206773www.express-cn.com)