Abstract
Equations enabling interferences due to sample matrix constituents in two-dimensional isotachophoretic analysis using the spike method to be estimated were derived. A computer program and a procedure based on these equations were developed for searching for optimum and less time consuming electrolyte systems and spacing constituents. The procedure, intended mainly for the trace analysis of the constituents present in complex ionic matrices, was examined in experiments with benzoate as a trace analyte. A model mixture of 50 arbitrarily chosen anionically migrating UV light-absorbing constituents simulated the sample matrix. A reasonable agreement in ordering the electrolyte systems according to interfering contributions of the sample matrix was obtained between the experimental and calculated data. Some discrepancies found in the examination of the proposed procedure are discussed.
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