A NEW SPECTROPHOTOMETRIC METHODS FOR BINA RY-MIXTURES RESOLUTION

In this work, a new spectrophotometric method for binary mixtures reso lution is proposed. A simple mathematic algorithm was designed, in whi ch the data are used from four linear regression calibration equations : two calibrations for each component at two selected wavelengths. The method of Kaiser was applied for selection of the optimum two-wavelen gth sets for all mixtures under study. The recovery experiments were c arried out in ten mixtures of the following dyes: tartrazine, sunset y ellow, amaranth, erythrosin B and allura red. The obtained results wer e compared with the results of commonly used derivative spectrophotome tric procedure. The statistical evaluation of the method bias was perf ormed and it was concluded that the proposed methodology is competitiv e for the derivative procedure. The method proposed was applied to the determination of two dyes in ''Kool-Aid'' samples of strawberry, incr ediberry, cherry and pineapple artificial flavors and the results obta ined were in agreement with those of the official methods.