The electrochemical behavior of sodium diethyldithiocarbamate has been studied. A method has been developed to determine trace amounts of the reagent by preparatory electrolysis at a suitable potential which causes the sparingly soluble electrochemical product to precipitate on a small graphite electrode. The inverse polarogram gives a current which can be evaluated quantitatively, produced by the re-dissolving of the film on the electrode. Sodium diethyldithiocarbamate can also be used for electrochemically concentrating cobalt in the form of a sparingly soluble compound of Co(III) by measuring the current required to reduce (re-dissolve) the compound. The electrochemical oxidation reaction of sodium diethyldithiocarbamate to give insoluble films could be used for indirect determination of the metal ions which interact with the reagent.