Details zur Publikation

Referenztyp Zeitschriften
DOI / URL Link
Titel (primär) Performance of the wet oxidation unit of the HPLC isotope ratio mass spectrometry system for halogenated compounds
Autor Gilevska, T.; Gehre, M.; Richnow, H.H.;
Journal / Serie Analytical Chemistry
Erscheinungsjahr 2014
Department ISOBIO;
Band/Volume 86
Heft 15
Sprache englisch;
POF III (gesamt) T41;
UFZ Querschnittsthemen 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
dauerhafte UFZ-Verlinkung 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