Estimate of the life time of superoxide in seawater

Frank J. Millero

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16 Scopus citations


The effects of ionic interactions on the dissociation of HO2 HO2→H+ + O-2 have been examined using the measurements of Bray et al. (1977) on the disproportionation of HO2 HO2 + HO2→H2O2 + O2. In NaCl solutions the values of pK*HO2 for ionization can be accounted for by using Pitzer's equations for activity coefficients. In CaCl2 and BaCl2 it was necessary to account for the formation of CaO+2 and BaO+2 ion pairs. The values of pKMO2 for the formation of these ion pairs (1.7 to 2.1) was of the same order of magnitude as for Mg2+ and Ca2+ interactions with F-, OH- and B(OH)-4. These ionic interaction results have been used to estimate K*{HO2} in seawater at 25°C. The values of t 1 2 for the disproportionation of HO2 in seawater estimated from these results are 3 to 5 times longer than in pure water.

Original languageEnglish (US)
Pages (from-to)351-353
Number of pages3
JournalGeochimica et Cosmochimica Acta
Issue number2
StatePublished - Feb 1987

ASJC Scopus subject areas

  • Geochemistry and Petrology


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