Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1058, Issue 1-2, Pages 107-112Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2004.08.149
Keywords
atmospheric pressure photoionization; carbonyls; 2,4-dinitrophenylhydrazine
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Atmospheric pressure photoionization-mass spectrometry (APPI-MS) is used for the analysis of aldehydes and ketones after derivatization with 2,4-dinitrophenylhydrazine (DNPH) and liquid chromatographic separation. In the negative ion mode, the [M-H](-) pseudomolecular ions are most abundant for the carbonyls. Compared with the established atmospheric pressure chemical ionization (APCI)-MS, limits of detection are typically lower using similar conditions. Automobile exhaust and cigarette exhaust samples were analyzed with APPI-MS and APCI-MS in combination with an ion trap mass analyzer. Due to improved limits of detection, more of the less abundant long-chain carbonyls are detected with APPI-MS in real samples. While 2,4-dinitrophenylazide, a known reaction product of DNPH with nitrogen dioxide, is detected in APCI-MS due to dissociative electron capture, it is not observed at all in APPI-MS. (C) 2004 Elsevier B.V. All rights reserved.
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