Multiphoton ionization/mass spectrometry of polybrominated diphenyl ethers
[摘要] Gaschromatographycombinedwithmultiphotonionization/time-of-flightmassspectrometry(GC/MPI/TOF-MS)usingultravioletpicosecondandfemtosecondlaserswasemployedtoquantitativelyanalyzeaseriesofpolybrominateddiphenylethers(PBDEs).CongenersfrommonoBDEtotetraBDEswereanalyzedusingapicosecondlaseremittingat266nm.InordertoenhancetheefficiencyofionizationforhighlybrominatedDEsviatripletlevels,adifferentlaseremittingat213nmwasused.Itwas,however,difficulttoquantifysuchcongeners,evenatthiswavelength.ThisunexpectedresultcanbeexplainedbythephotodecompositionofPBDEsfromthetripletlevels.Ontheotherhand,allcongenersfrommonoBDEtodecaBDEweredetectedwhenafemtosecondlaseremittingat267nmwasemployed.Interestingly,theisomershavingasmallernumberofBratomsatthemeta-positionsweremoreefficientlyionized,andprovidedlowervaluesofdetectionlimit...
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[效力级别] [学科分类] 分析化学
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