Oxidation of copper(I) in sea water

Virender K. Sharma, Frank J Millero

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63 Scopus citations


The oxidation of Cu(I) in air-saturated solutions of seawater has been measured as a function of pH (5.3-8.6), temperature (5-45°C), and salinity (5-44). The overall rate constant k (kg mol -1 min -1) d[Cu(I)]/dt = -k[Cu(I)][O 2] has been fitted to log k = 10.73 + 0.23pH - 2373/T - 3.33I 1/2 + 1.45I with a standard error of 0.08 in log k. The energy of activation was found to be 45.6 ± 1.7 kJ mol -1. The strong chloride dependence of the rates has been attributed to the effect of temperature and ionic strength on the oxidation of Cu + and CuCl 0 species. At a given Cl - concentration, the rates of oxidation in seawater are lower than in NaCl or NaCl-NaClO 4 mixtures. These differences in seawater are due to a decrease in the rates due to Mg 2+ and Ca 2+ and the increase in the rates due to HCO 3 -. Possible causes of these effects are discussed.

Original languageEnglish (US)
Pages (from-to)768-771
Number of pages4
JournalEnvironmental Science and Technology
Issue number7
StatePublished - 1988


ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry
  • Environmental Engineering

Cite this

Sharma, V. K., & Millero, F. J. (1988). Oxidation of copper(I) in sea water. Environmental Science and Technology, 22(7), 768-771.