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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2007.6
- 수록면
- 16 - 28 (13page)
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An improved method was developed to determine gas-phase hydrogen peroxide (H₂O₂) and organic hydroperoxides (ROOH) in real-time. The analytical system for H₂O₂ 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 H₂O₂, and hydroxylation of benzoic acid. By use of this analytical method rather than a previous similar method, Fenton reaction time was reduced from 2min. to 30 s. 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 ~5min to ~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 H₂O₂ determination. The system was applied to field measurements conducted during summertime of 2004 in Gwangju, South Korea. H₂O₂ was found to be a predominant species of peroxides. The diurnal variation of H₂O₂ displayed the maximum in early afternoon and the broad minimum throughout night. H₂O₂ was correlated positively with ozone,photochemical age, and temperature, however, negatively with NO<SUB>x</SUB> and relative humidity.
목차
Abstract
1. INTRODUCTION
2. EXPERIMENTAL
3. RESULTS AND DISCUSSION
4. FIELD MEASUREMENTS
5. SUMMARY AND CONCLUSIONS
ACKNOWLEDGEMENTS
REFERENCES
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