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S(IV), Se(IV), and Te(IV) are introduced into the melt by dissolving Na2SO3, SeO2, and TeO2, resp. and their electrochemical behavior is studied by linear sweep and cyclic voltammetry.

ChemInform Abstract In molten NaOH/KOH, the chalcogenide ions are electrochemically oxidized to chalcogenites as shown in the scheme; the corresponding values referred to the lower limit of the electrochemical window are 1.87 V (S2-), 1.71 V (Se2-), and 1.47 V (Te2-). In the case of sulfide, the formation of disulfide at a lower potential yields a well defined hump in the voltammetric peak at 483 K, which disappears at 623 K due to the instability of disulfide at higher temperatures. Owing to their lower stability, diselenide ions are produced only in solutions with high Se2-concentration. Ditelluride ions are not detected under the conditions used.