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Determination of TOCl, TOBr, and TOI in drinking water by pyrolysis and off-line ion chromatography

TitleDetermination of TOCl, TOBr, and TOI in drinking water by pyrolysis and off-line ion chromatography
Publication TypeJournal Article
Year of Publication2006
AuthorsHua G, Reckhow DA
JournalAnalytical and Bioanalytical Chemistry
Volume384
Issue2
Start Page495
Pagination495-504
Date Published01/2006
KeywordsIon chromatography, Pyrolysis, TOBr, TOCl, TOI, TOX
Abstract

The objective of this research was to determine the optimum total organic halogen (TOX) protocol for use with ion chromatographic (IC) detection to analyze total organic chlorine (TOCl), bromine (TOBr), and iodine (TOI) in drinking water simultaneously. Two commercial analyzers (one using a pure O2 carrier and one using O2/CO2 mixture) and three commercially available activated carbons (two coconut-based and one bituminous coal-based) were examined in this study. Results showed that the pyrolytic analyzer using pure O2 and off-line IC combined with a standard TOX carbon (coconut-based) achieved the most complete recovery of TOCl, TOBr and TOI for both model compounds and real samples. There was no obvious difference between the two analyzers when used in microcoulometric detection mode. The TOX method is moderately sensitive to nitrate rinse volume. The monohaloacetic acids were partly washed out during sample preparation. This problem was solved by a modified nitrate rinsing solution.

DOI10.1007/s00216-005-0214-3