Oxidation of Copper(I) in Seawater

Virender K. Sharma; Frank J. Millero

doi:10.1021/es00172a004

Oxidation of Copper(I) in Seawater

Virender K. Sharma, Frank J. Millero

Ocean Sciences

Research output: Contribution to journal › Article › peer-review

64 Scopus citations

Abstract

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) [formula omitted] has been fitted to [formula omitted] 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 CuCl⁰ species. At a given Cl^- concentration, the rates of oxidation in seawater are lower than in NaCl or NaCl-NaClO₄ mixtures. These differences in seawater are due to a decrease in the rates due to Mg²⁺ and Ca²⁺ and the increase in the rates due to HCO^-₃. Possible causes of these effects are discussed.

Original language	English (US)
Pages (from-to)	768-771
Number of pages	4
Journal	Environmental Science and Technology
Volume	22
Issue number	7
DOIs	https://doi.org/10.1021/es00172a004
State	Published - Jul 1 1988

ASJC Scopus subject areas

Chemistry(all)
Environmental Chemistry

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title = "Oxidation of Copper(I) in Seawater",

abstract = "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) [formula omitted] has been fitted to [formula omitted] 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 CuCl0 species. At a given Cl- concentration, the rates of oxidation in seawater are lower than in NaCl or NaCl-NaClO4 mixtures. These differences in seawater are due to a decrease in the rates due to Mg2+ and Ca2+ and the increase in the rates due to HCO-3. Possible causes of these effects are discussed.",

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T1 - Oxidation of Copper(I) in Seawater

AU - Sharma, Virender K.

AU - Millero, Frank J.

PY - 1988/7/1

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N2 - 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) [formula omitted] has been fitted to [formula omitted] 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 CuCl0 species. At a given Cl- concentration, the rates of oxidation in seawater are lower than in NaCl or NaCl-NaClO4 mixtures. These differences in seawater are due to a decrease in the rates due to Mg2+ and Ca2+ and the increase in the rates due to HCO-3. Possible causes of these effects are discussed.

AB - 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) [formula omitted] has been fitted to [formula omitted] 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 CuCl0 species. At a given Cl- concentration, the rates of oxidation in seawater are lower than in NaCl or NaCl-NaClO4 mixtures. These differences in seawater are due to a decrease in the rates due to Mg2+ and Ca2+ and the increase in the rates due to HCO-3. Possible causes of these effects are discussed.

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Oxidation of Copper(I) in Seawater

Abstract

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