Foam Separation of Mercury Ion with Chelating Surfactant: The Selectivity of the Removal of Cadmium and Mercury lons with 4-Dodecyldiethylenetriamine

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Abstract
Foam separation techniques for the removal of mercury ion were studied which employed a surfactant specifically designed to chelate with the ion. The chelating surfactant was 4-dodecyldiethylenetriamine. Mercury ion was found to be removed almost quantitatively from aqueous solution using this surfactant, even in the presence of a large concentration of other metallic ions. Formation constants and surface tensions of Cd and Hg ionic complexes with the surfactant were measured. Selectivity of the removal of Cd and Hg ions is discussed.