Abstract
In estimating the total concentration of similar analytes recalculated to a standard substance Xst, different sensitivities of their determination result in a systematic error δc, depending on the choice of Xst and the composition of the analyzed mixture. Two methods of predicting the limiting values of this error (δc max), with and without the account of the properties of Xst are proposed and tested on model mixtures. The methods can be used if the total analytical signal linearly depends on the concentrations of analytes and is additive (spectrophotometry, conductometry, etc.). The value of δc max is independent of the ratio of analytes concentrations in the sample. To reduce δc max, one should equalize the sensitivities of the determination of all compounds of a given type and use analytes with medium sensitivities as Xst.
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