Abstract
The reactions of copper(II), nickel(II), lead(II), cadmium(II), zinc(II), silver(I) and thallium(I) ions with sodium diethyldithiocarbamate (DDTC) were examined by thermometric titration for the determination of these metal ions. The divalent metal ions reacted with DDTC in a molar ratio of 1 : 2 and monovalent thallium ion reacted in that of 1 : 1. But the titration of silver(I) ion exhibited a nonstoichiometric end point before the equivalence point. The divalent metal ions in the range of 40120 μmol can be determined within 1% error in acetate buffer solution at pH 5.0. The heats of precipitation of Cu(II)-, Ni(II)-, Pb(II)-, Cd(II)- and Zn(II)-DDTC were measured.
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