Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/77718
Title: Selection criteria for oxidation method in total organic carbon measurement
Authors: Yoon, G
Park, SM
Yang, H
Tsang, DCW 
Alessi, DS
Baek, K
Keywords: Carbon dioxide
Combustion
Organic matter
Total organic carbon
Wet chemical oxidation
Issue Date: 2018
Publisher: Pergamon Press
Source: Chemosphere, 2018, v. 199, p. 453-458 How to cite?
Journal: Chemosphere 
Abstract: During the measurement of total organic carbon (TOC), dissolved organic carbon is converted into CO2 by using high temperature combustion (HTC) or wet chemical oxidation (WCO). However, the criteria for selecting the oxidation methods are not clear. In this study, the chemical structures of organic material were considered as a key factor to select the oxidation method used. Most non-degradable organic compounds showed a similar oxidation efficiency in both methods, including natural organic compounds, dyes, and pharmaceuticals, and thus both methods are appropriate to measure TOC in waters containing these compounds. However, only a fraction of the carbon in the halogenated compounds (perfluorooctanoic acid and trifluoroacetic acid) were oxidized using WCO, resulting in measured TOC values that are considerably lower than those determined by HTC. This result is likely due to the electronegativity of halogen elements which inhibits the approach of electron-rich sulfate radicals in the WCO, and the higher bond strength of carbon-halogen pairs as compared to carbon-hydrogen bonds, which results in a lower degree of oxidation of the compounds. Our results indicate that WCO could be used to oxidize most organic compounds, but may not be appropriate to quantify TOC in organic carbon pools that contain certain halogenated compounds.
URI: http://hdl.handle.net/10397/77718
ISSN: 0045-6535
EISSN: 1879-1298
DOI: 10.1016/j.chemosphere.2018.02.074
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