Simultaneous determination of Amaranth and Sunset Yellow by ratio derivative voltammetry.
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 solution of the components, and the first derivative of the ratio voltammogram is obtained. The concentration of the other component is then determined from a calibration graph. The method has been successfully applied for resolving binary mixtures of Amaranth and Sunset Yellow, which have overlapped adsorptive voltammograms in pH 6.0 McIlvane buffers.
Ni
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Department of Chemistry, Nanchang University, Nanchang 330047, China.
Bai
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J