Considerations sur les formes physico-chimiques du cobalt, manganese, zinc, chrome et fer dans une eau de mer enrichie ou non de matiere organique

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Abstract
Using the radioisotopes of five metal elements (Co, Mn, Zn, Cr, Fe) as tracers, the various physicochemical forms of the radioactive isotopes of the trace elements considered have been determined by strong cationic resin chromatography in a natural sea water and the same sea water enriched with marine algal organic matter. In natural sea water, three days after the introduction of the radionuclides, manganese and zinc were found mainly in soluble cationic forms (Mn2+, Zn2+). Cobalt seemed to be found in two soluble cationic forms (Co2+ and CoCl+); a slight anionic or neutral fraction was detected which may correspond to complexes with the ligand Cl− (CoCl42−, CoCl3− CoCl2). Chromium, strongly adsorbed on the walls was to be found as a soluble chromate (CrO42−). Iron was usually found in a colloidal state. The occurrence of an anionic or neutral fraction should point to a colloidal dispersion rather than a truly soluble form. The experiment shows the effect of organic matter on the physico-chemical equilibrium of zinc, chromium and iron by the formation of anionic, neutral (iron and chromium) or cationic (zinc) organo-metallic complexes. The action of the organic matter is all the stronger as the degree of insolubility of the radionuclide is higher (Fe > Cr > Zn). The occurrence of iron and chromium organic complexes is less in sea water samples with a weaker pH (4·5).

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