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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 25, Number 12
BKCSDE 25(12)
December 20, 2004 

Enhancing Effect of Organic Substances on Hydroxyl Radical Generation During Ozonation of Water: Stopped-Flow ESR Technique
Sang-Kuk Han
Ozonation, Phenol derivatives, Spin trapping ESR, Stopped flow, Hydroxyl radical
Generation of hydroxyl radical, one of their major active species in ozonation of water was directly observed with spin-trapping/electron spin resonance (ESR) technique using 5,5-dimethyl-pyrrolidine-1-oxyl (DMPO) as a spin-trapping reagent. Hydroxyl radical was trapped with DMPO as a stable radical, DMPO-OH. 80 mM of ozone produced 1.08 × 10?6 M of DMPO-OH, indicating that 1.4% of ·OH is trapped with DMPO if ·OH is produced stoichiometrically from ozone. Humic acid suppressed DMPO-OH generation in a dose-dependent manner. Generation rate of DMPO-OH was determined with ESR/stopped-flow measurement. Phenol derivatives increased the amount and generation rate of DMPO-OH, indicating that phenol derivatives enhance·OH generation during ozonation of water.
1907 - 1910
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