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Direct analysis of highly oxidised organic aerosol constituents by on‐line ion trap mass spectrometry in the negative‐ion mode
Author(s) -
Warscheid Bettina,
Hoffmann Thorsten
Publication year - 2002
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/rcm.602
Subject(s) - chemistry , atmospheric pressure chemical ionization , mass spectrometry , ion trap , chemical ionization , ion , limonene , monoterpene , ozonolysis , ion source , analytical chemistry (journal) , aerosol , volatile organic compound , mass spectrum , protonation , ionization , chromatography , organic chemistry , essential oil
On‐line ion trap mass spectrometry (ITMS) enables the characterisation of constituents of biogenic secondary organic aerosols in complex organic reaction mixtures. This real‐time analysis is achieved by directly introducing the airborne particles into the ion source of the mass spectrometer. Negative‐ion chemical ionisation at atmospheric pressure (APCI(−)) was used as the ionisation method of choice. The aerosols were generated from the gas‐phase ozonolysis of two C 10 H 16 ‐terpenes (α‐pinene and limonene), and investigated by performing on‐line APCI(−)−ITMS n . Highly oxidised compounds were tentatively identified as important particle‐phase products. Based on recent investigations of low‐energy collision‐induced dissociation pathways of a wide range of deprotonated multifunctional carboxylic acid species derived from monoterpene precursors (Warscheid B, Hoffmann T. Rapid Commun. Mass Spectrom . 2001; 15: 2259), the formation of structurally different C 10 H 16 O 5 and C 10 H 16 O 6 species, such as acidic esters from α‐pinene and aldo‐hydroxycarboxylic acids from limonene, is proposed. Copyright © 2002 John Wiley & Sons, Ltd.