Journal ArticleDOI
Nitrate-induced photooxidation of trace organic chemicals in water.
TLDR
The oxidation kinetics of butyl chloride, nitrobenzene, anisole, and methylmercury in the presence of hydroxyl radical (OH) scavengers were used to determine the rate and quantum efficiency for production of OH from irradiated nitrate ions in water.Abstract:
The oxidation kinetics of butyl chloride, nitrobenzene, anisole, and methylmercury in the presence of hydroxyl radical (OH) scavengers were used to determine the rate and quantum efficiency for production of OH from irradiated nitrate ions in water. The experiments were conducted under steady-state irradiations with monochromatic radiation (313 nm) and with sunlight. The mean quantum efficiency for OH production at 313 nm rises from 0.013 +/- 0.002 at 20 /sup 0/C to 0.017 +/- 0.003 at 30 /sup 0/C in the pH range 6.2-8.2. Results of this study are used to estimate nitrate-induced photooxidation rates of trace organic chemicals under a variety of environmental conditions. 27 references, 6 figures, 2 tables.read more
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Journal ArticleDOI
Photosensitized degradation of caffeine: role of fulvic acids and nitrate.
TL;DR: Study of the photolysis of caffeine in solutions of fulvic acid isolated from Suwannee River, GA and Old Woman Creek Natural Estuarine Research Reserve with different chemical amendments suggests that an oxygen dependent long-lived radical e.g., peroxyl radicals plays an important role in the degradation of caffeine at lower initial concentration.
Journal ArticleDOI
Hydroxyl radical-induced photochemical formation of dicarboxylic acids from unsaturated fatty acid (oleic acid) in aqueous solution
TL;DR: In this article, the direct and hydroxyl radical (OH)-induced photochemical production of low molecular weight (LMW) dicarboxylic acids and related compounds (C2-C9) (DCAs) from oleic acid (cis-9-octadecenoic, Δ9C18) in aqueous solution was assessed under laboratory controlled conditions.
Journal ArticleDOI
Extensive dark production of hydroxyl radicals from oxygenation of polluted river sediments
TL;DR: In this paper, the authors collected 22 polluted river sediments spanning a large gradient and area along the main stem of Maozhou river watershed of southern China and provided robust evidence that the transportation of river sediment from anoxic to oxic conditions triggered the extensive production of hydroxyl radical.
Journal ArticleDOI
TiO2-Photocatalytic Reduction of Pentavalent and Trivalent Arsenic: Production of Elemental Arsenic and Arsine
Ivana K. Levy,Martín Mizrahi,G. Ruano,G. Zampieri,G. Zampieri,Félix G. Requejo,Félix G. Requejo,Marta I. Litter,Marta I. Litter +8 more
TL;DR: Although reduction to solid As(0) is convenient for purposes of As removal from water as a deposit on TiO(2), attention must be paid to formation of AsH(3), one of the most toxic forms of As, and strategies for AsH (3) treatment should be considered.
Journal ArticleDOI
Similarities between inorganic sulfide and the strong Hg(II)-complexing ligands in municipal wastewater effluent.
Heileen Hsu-Kim,David L. Sedlak +1 more
TL;DR: The strong ligands that remained in the oxygen-oxidized samples were resistant to further oxidation by chlorine, indicating that oxidation of S(-II) results in the formation of other sulfur-containing ligands such as S8 that form strong complexes with Hg(II).
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