Temperature Dependence of Cu(II) Carbonate Complexation in Natural Seawater

Alan L. Soli, Robert H. Byrne

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Abstract

<p> Cu(II) carbonate complexation was examined in natural seawater between 5&deg; and 35&deg;C. The reaction enthalpy for the equilibrium Cu <sup> 2 </sup> + CO <sub> 3 </sub> <sup> 2&minus; </sup> &rlhar; CuCO <sub> 3 </sub> <sup> 0 </sup> , expressed in terms of total carbonate ion concentration, is &sim;2.5 kcal mol <sup> &minus;1 </sup> . The formation constant <sub> sw </sub> <em> &beta; </em> <sub> 1 </sub> = [CuCO <sub> 3 </sub> <sup> 0 </sup> ] [Cu <sup> 2+ </sup> ] <sup> &minus;1 </sup> CO <sub> 3 </sub> <sup> 2&minus; </sup> ] <sub> T </sub> <sup> &minus;1 </sup> , expressed in terms of total carbonate ion concentration in seawater, thus decreases by about 25% between 25&deg; and 5&deg;C.</p>
Original languageAmerican English
JournalLimnology and Oceanography
Volume34
DOIs
StatePublished - Jan 1 1989

Disciplines

  • Life Sciences

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