Abstract
The interaction of radiocobalt with glycine, alanine or aspartic acid dissolved in seawater was investigated by means of adsorption on Chelex 100, solvent extraction with dithizone or gel filtration chromatography.
Although the distribution coefficients of Co on Chelex 100 decreased gradually with ageing even in the absence of organic matter, much more decreases were observed in the presence of the amino acids. The distribution coefficients on the resin reached equilibrium states in about 20 days.
The extraction of cobalt with dithizone in carbon tetrachloride was also inhibited in the presence of the amino acids. Alanine and aspartic acid showed a similar interfering tendency in both adsorption on Chelex 100 and dithizone extraction, while glycine inhibited dithiz one extraction more than adsorption on Chelex 100.
From the fractionation of Co by Sephadex G-10 gel filtration chromatography, the higher molecular species of Co associated with the amino acids occurred after several days ageing and then increased together with decreasing in the lower molecular species.
