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Identification of low molecular weight organic acids by ion chromatography/hybrid quadrupole time‐of‐flight mass spectrometry during Uniblu‐A ozonation
Author(s) -
Amorisco Apollonia,
Locaputo Vito,
Pastore Carlo,
Mascolo Giuseppe
Publication year - 2012
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.6429
Subject(s) - chemistry , mass spectrometry , sulfur , electrospray , ion chromatography , tandem mass spectrometry , chromatography , mass spectrum , nitrogen , environmental chemistry , organic chemistry
RATIONALE The balance of organic nitrogen and sulfur during ozonation of organic pollutants often shows a lack of complete mineralization. It follows that polar and ionic by‐products are likely to be present that are difficult to identify by liquid chromatography/mass spectrometry (LC/MS). METHODS The structural elucidation of low molecular weight organic acids arising from Uniblu‐OH ozonation has been investigated by ion chromatography/electrospray tandem mass spectrometry (IC/ESI‐MS/MS) employing a quadrupole time‐of‐flight mass spectrometer. Unequivocal elemental composition of the by‐products was determined by a combination of mass accuracy and high spectral accuracy. RESULTS The employed identification strategy was demonstrated to be a powerful method of unequivocally assigning a single chemical composition to each identified compound. The exact mass measurements of [M–H] – ions allowed the elemental formulae and related structures of eighteen by‐products to be determined confidently. The main degradation pathways were found to be decarboxylation and oxidation. The experimental procedure allowed the identification of both nitrogen‐ and sulfur‐containing organic acid by‐products arising from Uniblu‐OH ozonation. CONCLUSIONS The obtained results are of environmental relevance for the balance of organic nitrogen and sulfur during the ozonation of organic pollutants due to the lack of complete mineralization of the compounds containing these atoms. Copyright © 2012 John Wiley & Sons, Ltd.