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The coinplexing abilities and the redox reactions of the pla— tinum metals and their periodic table neighbors are used to interpret their comparative marine chemistries. Two sets of environmental condi— tions are treated: the oxic milieu where dissolved oxygen gas can mi— tiate redox reactions; and the anoxic milieu where the waters are devoid of oxygen gas. In the latter case reductions of dissolved species may take place with the ever present organic phases. Analyses of seawaters, sediments and ferromanganese minerals are carried out using graphite furnace atomic absorption spectroscopy. All assays are followed with radioactive tracers for yield determination. Isolation of picomolar concentrations of these metals from seawater utilizes anion exchange resins with an ultimate isolation upon one or two beads.

Comparative chemistry of the platinum and other heavy metals in the marine environment