Cited by 2,169Advanced oxidation water treatmentFree Radicals and AntioxidantsPhysical Organic Chemistry and Reaction Kinetics

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Reactivity of HO2/O− 2 radicals in aqueous solution

Bielski, Benon H. J., Cabelli, Diane E., Arudi, Ravindra L., Ross, Alberta B.·1985·Journal of Physical and Chemical Reference Data

DOI 10.1063/1.555739

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Abstract

Kinetic data for the superoxide radical (HO2⇄O−2 +H+, pK=4.8) in aqueous solution have been critically assessed. Rate constants for reactions of O−2 and HO2 with more than 300 organic and inorganic ions, molecules and other transient species have been tabulated.

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“157 The latter is in equilibrium with its conjugate base, O2 •- (equilibrium reaction (10), pKa (HO2 • ) 158 = 4.8) and dominates even in slightly acid solution (Bielski et al., 1985, Ragnar et al., 1999a, 159 b).”
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“Disproportionation of O2 − into H2O2 in water at pH 7 is sufficiently fast (6 × 10 5 M s) (26) that at micromolar concentrations most of the H2O2 could originate from O2 − if the latter is not intercepted by hydroxylamine.”
Background
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“However, this is unlikely because the pKa of HO2 , in water is 4.8 (Bielski et al., 1985).”
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Authors: Bielski, B. H. J., Cabelli, D. E., Arudi, R. L., & Ross, A. B.
Affiliations: Brookhaven National Laboratory (US)
University of Notre Dame (US)
Venue: Journal of Physical and Chemical Reference Data
Publisher: AIP Publishing
Published: 1985-10-01
Volume: 14
Issue: 4
Pages: 1041-1100
ISSN: 0047-2689 (ISSN-L)
1529-7845
DOI: 10.1063/1.555739
OpenAlex: W2051802937
Cited by: 2,169
References: 0
Citations by year: 2026: 93 · 2025: 90 · 2024: 83 · 2023: 109 · 2022: 109 · 2021: 118 · 2020: 100 · 2019: 77 · 2018: 80 · 2017: 77 · 2016: 94 · 2015: 75 · 2014: 78 · 2013: 73 · 2012: 57
FWCI: 29.04
Type: journal article
Language: en
Open access: closed
Locations: Journal of Physical and Chemical Reference Data (publishedVersion)
Topics: Physical Sciences › Environmental Science › Water Science and Technology › Advanced oxidation water treatment
Physical Sciences › Chemistry › Organic Chemistry › Free Radicals and Antioxidants
Physical Sciences › Chemistry › Organic Chemistry › Physical Organic Chemistry and Reaction Kinetics
Keywords: superoxide, hydroperoxyl radical, reaction kinetics, rate constants, aqueous solutions, radical reactivity, hydrogen peroxide, critical appraisal, transient species

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Reactivity of HO2/O− 2 radicals in aqueous solution

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