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Environmental Engineering Research 2012;17(4): 205-210. DOI: https://doi.org/10.4491/eer.2012.17.4.205
An Advanced Kinetic Method for HO2∙/O2-∙ Determination by Using Terephthalate in the Aqueous Solution
Bum Gun Kwon1, Jong-Oh Kim2, and Joong-Keun Kwon1
1Department of Bioenvironmental and Chemical Engineering, Chosun University College of Science and Technology, Gwangju 501-744, Korea
2Department of Civil Engineering, Gangneung-Wonju National University, Gangneung 210-702, Korea
Corresponding Author: Bum Gun Kwon ,Tel: +82-62-230-8500, Fax: +82-62-876-8501, Email: kwonbg0@daum.net
Received: September 26, 2012;  Accepted: November 15, 2012.
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ABSTRACT
Hydroperoxyl radical/superoxide anion radical (HO2·/O2 -·, pKa = 4.8) as an intermediate is of considerable importance in oxidation processes. Hence, the method of detecting HO2·/O2 -· with high sensitivity is necessary to be developed. To achieve this objective, this study newly employed terephthalate (TA) as a probe for the measurement of HO2·/O2 -· in the kinetic method presented in our previous study. This method was based on the hydroxylation of TA to produce mainly hydroxyterephthalic acid or hydroxyterephthalate (OHTA), which was analyzed by fluorescence detection (λex = 315 nm, λem = 425 nm). The life-time of HO2·/O2 -· and its concentration formed from the photolysis technique of H2O2 were reported in this study. At range of pH 2–10, the life-time of HO2·/O2 -· was 51–422 sec. In particular, an increase in the life-time with pH was observed. The sensitivities of the kinetic method by using TA were always higher with 1.7–2.5 times at pH 8.0 than those by using benzoic acid. From these results, this study can contribute to understanding the basic functions of HO2·/O2 -· in oxidation processes.
Keywords: H2O2 | Hydroperoxyl radical | Kinetic method | Superoxide anion radical | UV
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