Determination of the total concentration (c Σ) of similar analytes recalculated to a standard substance Xst is a widely used but metrologically incorrect procedure leading to a high uncertainty of the results of analysis. An algorithm is proposed for the interval estimation of c Σ without recalculating to the concentration of Xst. The algorithm takes into account different sensitivities of the determination of analytes of the studied type. No information on the nature and ratio of analytes in the sample is used. The width of the range of possible values of c Σ objectively characterizes the systematic component of the error, it is independent of the choice of Xst, exceeds the width of traditional confidence intervals, and becomes zero at equal sensitivities of the determination of all analytes in a group. The accuracy of interval estimates is supported by the analysis of model mixtures of different types using several methods of measuring the total signal.
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Vershinin et al. (2016) studied this question.
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