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Optimizing electron spin resonance detection of hydroxyl radical in water.
Cheng, Shao-An; Fung, Wai-Kit; Chan, Kwong-Yu; Shen, P K.
Afiliação
  • Cheng SA; Department of Chemistry, The University of Hong Kong, Pokfulam Road, SAR, Hong Kong, China.
Chemosphere ; 52(10): 1797-805, 2003 Sep.
Article em En | MEDLINE | ID: mdl-12871746
ABSTRACT
The parameters affecting the electron spin resonance (ESR) detection of hydroxyl free radical in water are studied and optimized. The hydroxyl radical is generated by the Fenton reaction with iron (II) ammonium sulfate and hydrogen peroxide reacting in a phosphate buffer using N-tert-butyl-alpha-phenylnitron as the spin trap. The concentrations of Fe(2+), H(2)O(2), and phosphate buffer are the parameters studied. The Taguchi method and the orthogonal experiment design were used to evaluate the effects of these parameters on the ESR signal intensity. By the analysis of the signal-to-noise ratio and the analysis of variance, the order of importance of the various parameters on the hydroxyl radical formation is determined for optimal ESR detection of hydroxyl radical. The results will help the development of water purification technologies using hydroxyl free radical as a green oxidant.
Assuntos
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Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Água / Radical Hidroxila / Espectroscopia de Ressonância de Spin Eletrônica Tipo de estudo: Diagnostic_studies Idioma: En Revista: Chemosphere Ano de publicação: 2003 Tipo de documento: Article
Buscar no Google
Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Água / Radical Hidroxila / Espectroscopia de Ressonância de Spin Eletrônica Tipo de estudo: Diagnostic_studies Idioma: En Revista: Chemosphere Ano de publicação: 2003 Tipo de documento: Article