Abstract
A theoretical model has been developed in order to test the hypothesis that simple organic acids are the chief agents of trace metal solubility in H 2S-rich marine waters. The model utilizes stability constant given by Sillen and Martell (1964, 1971) and assumes that the free cation activity of each metal is controlled by simple solubility products. Typical values of pH, pS and Eh are employed in the calculations. The results indicate that free amino acids and hydrocarboxylic acids probably are not effective but that bisulfide and polysulfide complexes may be the chief agents of trace metal solubility. To the extent that it is present, the effect of dissolved organic matter on trace metal solubility probably resides in highly polymerized substances (e.g. humic acids).
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