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Development of Photo-Fenton Method for Gaseous Peroxides Determination and Field Observations in Gwangju, South Korea  

Chang, Won-Il (Department of Earth and Environmental Sciences, Korea University)
Shim, Jae-Bum (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology)
Hong, Sang-Bum (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology)
Lee, Jai H. (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology)
Publication Information
Journal of Korean Society for Atmospheric Environment / v.23, no.E1, 2007 , pp. 16-28 More about this Journal
Abstract
An improved method was developed to determine gas-phase hydrogen peroxide($H_2O_2$) and organic hydro-peroxides (ROOH) in real-time, The analytical system for $H_2O_2$ is based on formation of hydroxybenzoic acid (OHBA), a strong fluorescent compound. OHBA is formed by a sequence of reactions, photoreduction of Fe(III)-EDTA to Fe(II)-EDTA, the Fenton reaction of Fe(II)-EDTA with $H_2O_2$, and hydroxylation of benzoic acid. By use of this analytical method rather than a previous similar method, Fenton reaction time was reduced from 2 min. to 30s. Air samples were collected by a surfaceless inlet to prevent inlet line losses. With a special arrangement of the sampling apparatus, sample delivery time was drastically reduced from ${\sim}5\;min\;to\;{\sim}20\;s$. The automated system was found to be sensitive, capable of continuous monitoring, and affordable to operate. A comparison of this method with a well-established one showed an excellent linear correlation, validating applicability of this technique to $H_2O_2$ determination. The system was applied to field measurements conducted during summertime of 2004 in Gwangju, South Korea. $H_2O_2$ was found to be a predominant species of peroxides. The diurnal variation of $H_2O_2$ displayed the maximum in early afternoon and the broad minimum throughout night. $H_2O_2$ was correlated positively with ozone, photochemical age, and temperature, however, negatively with $NO_x$ and relative humidity.
Keywords
Hydrogen peroxide; Organic hydroperoxides; Photo-Fenton reaction; Instrumentation; Field measurements;
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