Organic and inorganic speciation of copper in the Irish Sea |
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| Authors: | Constant MG Van Den Berg |
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| Institution: | Department of Oceanography, University of Liverpool, Liverpool L69 3BX Gt. Britain |
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| Abstract: | The metal complexing ability of surface water of the Irish Sea has been measured by the MnO2 adsorption method. In all samples strong copper-chelating compounds are present at concentrations of 60–150 nM, with conditional stability constants (log values) of 10.0–10.4. The concentrations of Cu, Pb and Cd in the samples are 16–39 nM, 1–7 nM and 0.1–2 nM, respectively; much less than the ligand concentrations. The organic compounds form complexes with 94–98% of dissolved copper, and therefore constitute the major form of copper in surface water of the Irish Sea. Recalculation of speciation of the inorganic fraction of copper in seawater reveals that the major complex ion is that of CuCO30 (60%), followed by CuOH+ (16%) and Cu(OH)20 (16%). Complexes with borate ions form a small and rather insignificant fraction of 1%. |
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