Showing papers by "Yongnian Ni published in 1997"
TL;DR: A ratio derivative voltammetric method for resolving overlapping voltammograms without a pre-separation is described and has been successfully applied for resolving binary mixtures of Amaranth and Sunset Yellow, which have overlapped adsorptive voltammogram in pH 6.0 McIlvane buffers.
53 citations
TL;DR: A quantitative chemometric approach, iterative target transformation factor analysis (ITTFA), was applied to the simultaneous determination of mixtures of four food colorants (Amaranth, Sunset Yellow Tartrazine and Ponceau 4R) by adsorptive voltammetry as discussed by the authors.
Abstract: A quantitative chemometric approach, iterative target transformation factor analysis (ITTFA), was applied to the simultaneous determination of mixtures of four food colorants (Amaranth, Sunset Yellow Tartrazine and Ponceau 4R) by adsorptive voltammetry The conventional and first-derivative voltammograms of the quaternary mixtures were used to perform the optimization of the calibration procedure by the ITTFA models The proposed method was applied satisfactorily to the determination of a set of synthetic quaternary mixtures of colorant in phosphate/citric acid buffers (pH 57) and acceptable results were obtained No significant advantages were found with the application of derivative technique in this voltammetric work
31 citations