The products from the oxidation of H2S in seawater

Jia Zhong Zhang, Frank J Millero

Research output: Contribution to journalArticle

110 Citations (Scopus)

Abstract

The oxidation of sulfide in seawater is an overall second-order reaction, first-order with respect to both sulfide and oxygen. The major products formed from the oxidation of H2S with O2 have been measured in water and seawater as a function of pH (4-10), temperature (10-45°C), and salinity (0-36). The major products formed from the oxidation of H2S were SO2- 3, S2O2- 3, and SO4 2-. The pH dependence of the product distribution has been attributed to the effect of pH on the rate of the individual reaction steps. A kinetic model was developed to account for the distribution of the reactants and products. The model is based on the following overall reactions: {A figure is presented}{A figure is presented}{A figure is presented} Rate constants were determined for the oxidation of HS- and formation of SO3 2- (k1), for the oxidation of SO3 2- and production of SO4 2- (k2) and for the formation of S2O3 2- from HS- and SO3 2- (k3). These values of k1, k2, and k3 as a function of pH, temperature, and salinity can predict the concentrations of the measured reactants and products within experimental error. The effect of metals (Fe3+, Fe2+, Mn2+, Cu2+, and Pb2+) and oxides (α-FeOOH and MnO2) on the product distribution has also been examined. The field measurements from the Framvaren Fjord (Norway) and Cariaco Trench (Venezuela) are in reasonable agreement with the laboratory results at the same concentration of Fe2+ as in the anoxic basins.

Original languageEnglish (US)
Pages (from-to)1705-1718
Number of pages14
JournalGeochimica et Cosmochimica Acta
Volume57
Issue number8
DOIs
StatePublished - 1993

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Seawater
seawater
oxidation
Oxidation
Sulfides
sulfide
salinity
Oxides
fjord
Rate constants
Metals
trench
product
Oxygen
temperature
Temperature
Kinetics
oxide
Water
kinetics

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

The products from the oxidation of H2S in seawater. / Zhang, Jia Zhong; Millero, Frank J.

In: Geochimica et Cosmochimica Acta, Vol. 57, No. 8, 1993, p. 1705-1718.

Research output: Contribution to journalArticle

Zhang, Jia Zhong ; Millero, Frank J. / The products from the oxidation of H2S in seawater. In: Geochimica et Cosmochimica Acta. 1993 ; Vol. 57, No. 8. pp. 1705-1718.
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