Diethyldithiocarbamate-sensitive electrode for the simultaneous determination of metals

An electrode sensitive for diethyldithiocarbamate ions (DDC) down to 10/sup -5/ M is prepared by precipitation of copper diethyldithiocarbamate and silver sulfide within a graphite rod. The electrode is used as a monitor for simultaneous titration of binary, tertiary, and quaternary metallic mixtures of Cu, Cd, Ni, Pb, V, Th, and Zn in 50 to 75% ethanol at pH 4 to 6 using NaDDC as a titrant. Stepwise titration curves with sharp end point breaks and results with an average recovery of 98.5% (mean standard deviation +- 0.4%) are obtained with as little as 50 ..mu..g/mL of all these metal ions. Application of the method to simultaneous determination of some major elements in five different copper-base alloys gives results which compare favorably with certified values.

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