beta-Dithiocarbaminopropionic acid as a new masking agent: complexometric determination of zinc in the presence of cadmium.
A new masking agent in complexometry, beta-dithiocarbaminopropionic acid (beta-DTCPA) is proposed. beta-DTCPA forms very stable water-soluble complexes with a number of metal ions. Zinc can be titrated selectively with EDTA at pH 5-6 in the presence of large amounts of cadmium, which is masked effectively as a cadmium-beta-DTCPA complex. Correct results have been obtained with Cd/Zn ratios up to 300: 1.
Russeva
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E
Bulgarian Academy of Sciences, Institute of General and Inorganic Chemistry, Sofia 13, Bulgaria.
Budevsky
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O