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Competition Between O2 and H2O2 in the Oxidation of Fe(II) in Natural Waters

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The oxidation rates of nanomolar levels of Fe(II) in seawater (salinity S = 36.2) by mixtures of O2 and H2O2 has been measured as a function of pH (5.8–8.4) and temperature (3–35∘C). A competition exists for the oxidation of Fe(II) in the presence of both O2 (μ mol⋅L−1 levels) and H2O2 (nmol⋅L−1 levels). A kinetic model has been applied to explain the experimental results that considers the interactions of Fe(II) with the major ions in seawater. In the presence of both oxidants, the hydrolyzed Fe(II) species dominate the Fe(II) oxidation process between pH 6 and 8.5. Over pH range 6.2–7.9, the FeOH+ species are the most active, whereas above pH 7.9, the Fe(OH)02 species are the most active at the levels of CO2−3 concentration present in seawater. The predicted Fe(II) oxidation rate at [Fe(II)]0 = 30nmol⋅L−1 and pH = 8.17 in the oxygen-saturated seawater with [H2O2]0 = 50nmol⋅L−1 (log 10 k = −2.24s−1) is in excellent agreement with the experimental value of log 10 k = −2.29s−1 ([H2O2]0 = 55nmol⋅L−1, pH = 8).

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Authors and Affiliations

  1. Departamento de Química, Facultad de Ciencias del Mar, Universidad de Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, 35017, Spain

    Melchor González-Dávila & J. Magdalena Santana-Casiano

  2. Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, Florida, 33149

    Frank J. Millero

Authors
  1. Melchor González-Dávila
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  2. J. Magdalena Santana-Casiano
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  3. Frank J. Millero
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Correspondence to Frank J. Millero.

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González-Dávila, M., Santana-Casiano, J.M. & Millero, F.J. Competition Between O2 and H2O2 in the Oxidation of Fe(II) in Natural Waters. J Solution Chem 35, 95–111 (2006). https://doi.org/10.1007/s10953-006-8942-3

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  • DOI: https://doi.org/10.1007/s10953-006-8942-3

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