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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

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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.

Keywords: DEOXYRIBOSE-THIOBARBITURIC ACID ASSAY; FERRIC-HYDROXY COMPLEX; HYDROXYL RADICAL; SECOND-ORDER RATE CONSTANTS; SUBSTITUTED BENZENES

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143001X139236

Publication date: March 1, 2001

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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