Abstract
The chelating ability of Pb-210 for two natural organic materials, Na-alginate and a humic acid type of terrestrial origin, has been tested in sea water and other related media by measurements with high voltage paper electrophoresis. For the polysaccharide alginate Pb-210 chelation in sea water is indicated by the observed change of electrophoretic mobility. The chelation becomes favoured with decreasing salinity as measurements in sea water diluted with distilled water reveal. Humic acid has been tested in sea water and 0.55 M NaCl. No significant Pb-210 chelation is indicated up to humic acid concentrations far above the level to be presumed according to available literature data as dissolved in oceanic waters. This stability constant of Pb-chelates with humic acids, the competition of alkaline earth ions and of other inorganic complexing anions affecting significantly the chelation of trace metals in sea water, as has been established previously by comprehensive voltammetric investigations with organic ligands of larger and well defined chelating potentialities.
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