Publication Details

Reference Category Journals
DOI / URL link
Title (Primary) Performance of the wet oxidation unit of the HPLC isotope ratio mass spectrometry system for halogenated compounds
Author Gilevska, T.; Gehre, M.; Richnow, H.H.;
Journal Analytical Chemistry
Year 2014
Department ISOBIO;
Volume 86
Issue 15
Language englisch;
POF III (all) T41;
UFZ wide themes RU3;
Abstract The performance of liquid chromatography–isotope ratio mass spectrometry (LC-IRMS) for polar halogenated compounds was evaluated. Oxidation capacity of the system was tested with halogenated acetic acids and halogenated aromatic compounds. Acetic acid (AA) was selected as a reference compound for complete oxidation and compared on the molar basis to the oxidation of other analytes. The isotope values were proofed with calibrated δ13C values obtained with an elemental analyzer (EA). Correct isotope values were obtained for mono- and dichlorinated, fluorinated, and tribrominated acetic acids and also for aniline, phenol, benzene, bromobenzene, chlorobenzene, 1,2-dichlorobenzene, 2,4,6-trichlorophenol, pentafluorophenol, and nitrobenzene. Incomplete oxidation of trichloroacetic acid (TCA) and trifluoroacetic acid (TFA) resulted in lower recovery compared to AA (37% and 24%, respectively) and in isotopic shift compared to values obtained with EA (TCA Δδ13CEA/LC-IRMS = 8.8‰, TFA Δδ13CEA/LC-IRMS = 6.0‰). Improvement of oxidation by longer reaction time in the reactor and increase in the concentration of sulfate radicals did not lead to complete combustion of TCA and TFA needed for δ13C analysis. To the best of our knowledge, this is the first time such highly chlorinated compounds were studied with the LC-IRMS system. This work provides information for method development of LC-IRMS methods for halogenated contaminants that are known as potential threats to public health and the environment.
ID 15154
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=15154
Gilevska, T., Gehre, M., Richnow, H.H. (2014):
Performance of the wet oxidation unit of the HPLC isotope ratio mass spectrometry system for halogenated compounds
Anal. Chem. 86 (15), 7252 - 7257