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A ratio derivative voltammetric method for resolving overlapping voltammograms without a pre-separation is described. The method is based on the use of the first derivative of ratios of the voltammograms of binary mixtures. The voltammogram of the mixture is obtained and the amplitudes of the current at appropriate potentials are divided by the corresponding amplitudes in the voltammogram of a standard...
Synthetic colorants, such as Amaranth, Sunset Yellow, Tartrazine and Ponceau 4R, have sensitivity adsorptive voltammetric waves in solution containing a phosphate-citric acid buffer and a potassium chloride supporting electrolyte (pH 5.7; I = 0.5 mol 1 -1 ). The waves of these colorants, however, are seriously overlapped and it is difficult to determine them simultaneously without a...
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