Abstract
2-Mercaptobenzothiazole, 2-mercaptobenzimidazole and 2,5-dimercapto-1,3,4-thiadiazole loaded on silica gel, activated carbon and polytrifluorochloroethylene powder are compared for sorption and desorption of copper(II) ions. The separations are compared with those based on precipitation or extraction with these reagents. Columns of 2-mercaptobenzothiazole and 2-mercaptobenzimidazole on silica gel are particularly efficient for quantitative sorption of copper(II) from aqueous solutions at very high flow rates. 2-Mercaptobenzothiazole on silica gel is considered to be the most useful, as it reacts at pH 4.0, instead of pH 6.0 for 2-mercaptobenzimidazole. 2,5-Dimercapto-1,3,4-thiadiazole on silica gel removed copper from highly acidic solutions, but silica gel adsorbed this ligand only poorly, so that column capacity was severely restricted.
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