Role of metal-organic complexes in the marine environment: A comparison of the copper and ligand titration methods |
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| Authors: | Katsumi Hirose Yukio Sugimura |
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| Institution: | Geochemical Laboratory, Meteorological Research Institute, Nagamine 1-1, Yatabe, Tsukuba, Ibaraki 305 Japan |
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| Abstract: | The differences in quality of the conditional stability constants deduced from ligand titration and metal titration methods are theoretically examined. The ecological role of the metal-organic complexes in seawater was considered on the basis of the concept of the metal buffering capacity index which is calculated from the conditional stability constant and the organic ligand concentration. The results of theoretical examination of the effect of metal contamination on the uptake of metals by phytoplankton indicate that the ecological significance of metal-organic complexes is essentially in the metal-buffering action. This means that the activities of free metal ions are maintained at a native constant level against relatively small perturbations by the addition or uptake of metals in the marine environment. |
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