Photochemical Production of Hydroxyl Radical from Aqueous Iron(III)–Hydroxy Complex: Determination of Its Reaction Rate Constants with Some Substituted Benzenes Using Deoxyribose-Thiobarbituric Acid Assay
Abstract:Hydroxyl radical (•OH) production, mediated by UV light, from aqueous ferric perchlorate was investigated at low pH using a deoxyribose–thiobarbituric acid (–TBA) assay. The rate of production of •OH was found to be dependent on the irradiation time. Addition of suitable substrates such as substituted benzenes can compete for the reaction of •OH with deoxyribose, leading to a decreased yield of TBA chromogen formed from the deoxyribose–TBA assay. The second-order rate constants of the added substrates can be determined from such a simple competition kinetic method. The second-order rate constants for the reaction of •OH with a number of substituted benzenes were determined using this method and the values were compared with the reported rate constants using pulse radiolysis technique. The values determined using the present method (1 to 8 × 109 dm3/mol·s) are in good agreement with those reported by use of the pulse radiolysis technique. It is proposed that the photoproduction of •OH from aqueous ferric perchlorate coupled with deoxyribose–TBA assay is a simple and efficient method for determination of rate constants for the reaction of •OH with a variety of substituted benzenes that are known to be organic water contaminants.
Document Type: Research Article
Publication date: March 1, 2001
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