迭代目标转换因子分析法在吸附伏安法中的应用──混合色素的同时测定

将迭代目标转换因子分析法应用于混合色素溶液吸附伏安波谱的解析,完成了苋菜红、日落黄、柠檬黄和胭脂红混合色素在磷酸氢二钠-柠檬酸缓冲溶液(pH=5.7)中的吸附伏安法同时测定,取得了较满意的结果。

Adsorptive Voltammetric Determination of Mixed Pigment by Iterative Target Transformation Factor Analysis

Synthetic pigments,such as amaranth,sunset yellow,tartrazine and ponceau 4R,have sensitive adsorptive voltammograms in a phosphate buffer(pH=5.7).The voltammetric waves of these pigments,however,are seriously overlapped and it is difficult to determine them without a preseparation,In this paper,the experimental conditions were investigated.The mixture was accumulated for 240 s at a HMDE with a accumulate potential,-100 mV.After a 10 s quiet time the potential was then scanned from-100 to-1100 mV using linear sweep voltammetry(LSV) with a scan rate,100 mV/s.The voltammetric data of mixed pigments were processed by a chemometric approach,iterative target transformation factor analysis(ITTFA)and acceptable results with a total prediction error,8.35%,were obtained.