Solution Chemistry, Solubility, and Adsorption Equilibria of Iron, Cobalt, and Copper in Marine Systems.

摘要

The stability constants for the formation of FeOH(2+) and Fe(OH)2(+) complexes have been determined at an ionic strength of 0.68, and measurements in natural seawater verify the application of these constants to marine systems. The solubility of freshly precipitated hydrous ferric oxide was determined in natural seawater over the pH range 4.0 to 9.5. The results of this work were applied to consideration of the chemical forms of iron over the range of Eh and pH found in natural systems. The adsorption of Cu(2+) and Co(2+) onto illite and other substrates has been investigated and a model was developed to account for the adsorption equilibria of these metals as a function of pH for natural systems ranging from river water to oceanic waters. The application of these results to man-induced chemical changes in the marine environment is frequently limited by the lack of necessary information such as redox conditions, distinction between soluble and particulate phases, and the presence of complexing ligands. (Author)