Abstract

The interaction between a unialgal species (<i>Stichococcus bacillaris</i>) 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 × 10⁵. 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 <i>S. bacillaris</i> is carboxylate. Gold(III) was also found to strongly interact with <i>S. bacillaris.</i>

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