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The Direct Analysis of Semi‐volatile Organic Compounds by Membrane Introduction Mass Spectrometry
Author(s) -
Cisper M. E.,
Hemberger P. H.
Publication year - 1997
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/(sici)1097-0231(19970830)11:13<1449::aid-rcm26>3.0.co;2-y
Subject(s) - chemistry , chemical ionization , mass spectrometry , microporous material , nitrobenzene , chromatography , analytical chemistry (journal) , electron ionization , membrane , ambient ionization , ionization , organic chemistry , ion , catalysis , biochemistry
We present results for direct on‐line detection of semi‐volatile compounds in air using membrane introduction ion trap mass spectrometry. Brief sampling periods of 10 seconds to 3 minutes produced linear and reproducible data for concentrations ranging from parts‐per‐trillion to parts‐per‐billion by volume. The method uses a composite membrane made by plasma deposition of a thin polydimethylsilicone layer on a microporous polypropylene support fiber. Charge exchange ionization was used for a variety of semi‐volatile compounds and produced enhanced responses when compared to electron ionization. Among the semi‐volatile species studied are dimethyl methylphosphonate, malathion, nitrobenzene, methyl salicylate, 2‐chlorophenol, cyclohexanol, diethyl malonate and naphthalene. We also demonstrate direct analysis of semi‐volatile compounds in aqueous solution with the composite membrane by the detection of 2‐chlorophenol in water using both electron ionization and proton transfer chemical ionization. © 1997 John Wiley & Sons, Ltd.