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• W2341479152 abstract "Kinetics and mechanisms of As(III) oxidation by free available chlorine (FAC-the sum of HOCl and OCl-), ozone (O3), and monochloramine (NH2Cl) were investigated in buffered reagent solutions. Each reaction was found to be first order in oxidant and in As(III), with 1:1 stoichiometry. FAC-As(III) and O3- As(III) reactions were extremely fast, with pH-dependent, apparent second-order rate constants, kapp, of 2.6 (±0.1) × 105 M -1 s-1 and 1.5 (±0.1) × 106 M -1 s-1 at pH 7, whereas the NH2Cl-As(III) reaction was relatively slow (kapp = 4.3 (±1.7) × 10-1 M-1 s-1 at pH 7). Experiments conducted in real water samples spiked with 50 μg/L As(III) (6.7 × 10 -7 M) showed that a 0.1 mg/L Cl2 (1.4 × 10 -6 M) dose as FAC was sufficient to achieve depletion of As(III) to 75% As(III) oxidation could be achieved within 10 s of dosing 1-2 mg/L Cl2 (1.4-2.8 × 10-5 M) as FAC. As(III) residuals remaining in NH3-containing waters 10 s after dosing FAC were slowly oxidized (t1/2 ≥ 4 h) in the presence of NH 2Cl formed by the FAC-NH3 reaction. Ozonation was sufficient to yield >99% depletion of 50 μg/L As(III) within 10 s of dosing 0.25 mg/L O3 (5.2 × 10-6 M) to real waters containing <2 mg-C/L of DOC, while 0.8 mg/L O3 (1.7 × 10-5 M) was sufficient for a water containing 5.4 mg-C/L of DOC. NH3 had negligible effect on the efficiency of As(III) oxidation by O3, due to the slow kinetics of the O3-NH3 reaction at circumneutral pH. Time-resolved measurements of As(III) loss during chlorination. © 2006 American Chemical Society. Index Keywords: Concentration (process); Oxidation; Ozone; pH effects; Reaction kinetics; Stoichiometry; Water treatment; Buffered reagent solutions; DOC concentrations; Time resolved measurements; Arsenic; ammonia; arsenic; chloramine derivative; chlorine; drinking water; ozone; Arsenic; Concentration (process); Oxidation; Ozone; pH effects; Reaction kinetics; Stoichiometry; Water treatment; arsenic; chlorine; drinking water; oxidation; ozone; water treatment; aqueous solution; article; chlorination; concentration (parameters); kinetics; molecular model; oxidation; ozonation; pH measurement; stoichiometry; water treatment; Ammonia; Arsenic; Cations; Chloramines; Chlorine; Hydrogen-Ion Concentration; Kinetics; Oxidation- Reduction; Ozone; Water Purification; Water Supply" @default.
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• W2341479152 date "2006-01-01" @default.
• W2341479152 modified "2023-09-27" @default.
• W2341479152 title "Kinetics and mechanistic aspects of As(III) oxidation by aqueous chlorine, chloramines, and ozone: Relevance to drinking water treatment" @default.
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