Study of Solute Influences on the Binding of Metals to Stichococcus Bacillaris with 113Cd NMR

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Abstract
The interaction between a unialgal species ( Stichococcus bacillaris) and cadmium in the presence of several different solutes was investigated by 113Cd NMR. The interaction between the algae and cadmium was very strong, and the Cd/algae complex has an average formation constant of 2.8 × 10s. Upon addition of different solutes into the algae suspension, two results were obtained: in some cases the cadmium in the Cd/algae biomass was removed, and in other situations water molecules around the bound cadmium were replaced by the added ligands. When the Cd/algae biomass was suspended in acetic acid or sodium acetate buffer solutions, some of the bound cadmium was released, but only one resonance was observed for both the Cd/algae complex and the free cadmium in the solution. This chemical shift similarity indicates that the predominant functional group on the cell wall of S. bacillaris is carboxylate. Gold(III) was also found to strongly interact with S. bacillaris.