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1、Talanta66(2005)7479Niobium(V)oxidecoatedonthinglassceramicrodasasolidphasemicroextractionfiberAlineFernandesdeOliveiraa,CristianBertodaSilveiraa,SilviaDenofredeCamposb,ElvioAntoniodeCamposb,EduardoCaraseka,∗aDepartamentodeQu´ımica,UniversidadeFederald
2、eSantaCatarina,Florian´opolis88040-900,SC,BrazilbCentrodeCiˆenciasExataseTecnol´ogicas,UniversidadeEstadualdoOestedoParan´a,Toledo85903-000,PR,BrasilReceived19July2004;receivedinrevisedform15September2004;accepted23September2004Availableonline8Decemb
3、er2004AbstractTheefficiencyofniobium(V)oxideasasorbentphaseforsolidphasemicroextraction(SPME)wasinvestigated.Thethinglassceramicrodwascoatedwithniobium(V)oxideusingchemicalvapordepositionandNb2O5asachemicalprecursor.Optimumconditionsforthepreparationa
4、ndconditioningofthefibersarepresented.Thefiberswereusedfortheextractionofamixtureofalcoholsandamixtureofphenolsfromtheheadspacesamples.Theresultsobtainedprovedthesuitabilityofniobium(V)oxideasanewSPMEfiber.Thecalibrationgraphsforalcoholsandphenolsinacon
5、centrationrangeof501000gl−1werelinear(r>0.995)andthedetectionlimitswerebelow0.8gl−1level.Therepeatabilityforonefiber(n=6)undersimilarconditionswasbetween3and10.4%.Thefiber-to-fiberreproducibility(n=6)wasbetween5and15%.©2004ElsevierB.V.Allrightsreserve
6、d.Keywords:Gaschromatography;Solidphasemicroextraction;Niobium(V)oxidecoating;Alcohol;Phenol1.Introductioncost,durability,sensitivity,andavastrangeofapplications[7].Solidphasemicroextraction(SPME)hasbeenusedfortheThesolgeltechnologyhasbeenwidelyusedt
7、oprepareextractionofawidevarietyofvolatileandsemi-volatileor-SPMEfibersbecauseitcaneffectivelycreatechemicallyganiccompoundsfromenvironmental[1,2],biological[3,4]bonded,porous,andhighlycrossedcoatingonthefused-andfoodsamples[5,6].Thistechniquehasbecom
8、eattractivesilicafibersurface[8].ThesolgeltechnologywasusedtonotonlybecauseofitshighextractionefficiencyanditsnotpreparecoatingsofterminatedPDMS[911],crownetherrequiringsolventsintheextractionstepbutalsobecauseof[12,13],n-octyltriethoxysilane[14],calyx
