Methodology of the spectrophotometric analysis of organic mixtures: Error of estimating total analyte concentrations taking into account their sensitivity coefficients

摘要

In estimating the total concentration of similar analytes in recalculated to the reference substance of X _(st), different sensitivities of the photometric determinations of analytes and X _(st) result in systematic errors depending on the choice of X _(st) and sample composition. A method of prediction of this error is proposed and tested on model antioxidant mixtures. Its application to the analysis of mixtures with approximately known compositions allows the optimization of the choice of X _(st) and can improve the accuracy of estimating the total concentration of analytes.