Measurement of Hydroxy Carbonyls and Other Carbonyls in Ambient Air Using Pentafluorobenzyl Alcohol as a Chemical Ionization Reagent
1999; American Chemical Society; Volume: 71; Issue: 16 Linguagem: Inglês
10.1021/ac9900432
ISSN1520-6882
AutoresReggie S. Spaulding, Paul Frazey, Xin Rao, M. Judith Charles,
Tópico(s)Odor and Emission Control Technologies
ResumoHydroxy carbonyls and other carbonyls were measured in air by sampling with impingers filled with an aqueous solution of O-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine hydrochloride (PFBHA), further reacting the PFBHA derivatives of hydroxy carbonyls with bis(trimethylsilyl)trifluoroacetamide (BSTFA), and detecting the derivatives with gas chromatography/ion trap mass spectrometry. Molecular weight determinations of ultratrace (pptv) levels of the derivatives in the presence of coeluting interferences was made possible by using pentafluorobenzyl alcohol (PFBOH) as a chemical ionization reagent. Methyl vinyl ketone, methacrolein, methylglyoxal, glycolaldehyde, and hydroxyacetone were identified in air collected in Azusa, CA. Methyl vinyl ketone, methacrolein, methylglyoxal, hydroxyacetone, glyoxal, and 3-hydroxy-2-butanone were identified in samples collected in Davis, CA. To our knowledge, this is the first report of hydroxyacetone and 3-hydroxy-2-butanone in the ambient atmosphere. This work is a significant contribution to the measurement of hydroxy carbonyls in air. It demonstrates the potential of the method to measure water-soluble carbonyls for which no or little ambient air data exist. It is also the first study that applies pentafluorobenzyl derivatization along with ion trap mass spectrometry to measure carbonyls in the ambient atmospheric environment.
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