H-Point Standard Addition Method Applied to Voltammetry of Microparticles. Quantitation of Dyes in Pictorial Samples

Autor: José Vicente Gimeno-Adelantado, Francisco Bosch-Reig, M. T. Doménech-Carbó, Antonio Doménech-Carbó
Rok vydání: 2007
Předmět:
Zdroj: Electroanalysis. 19:1575-1584
ISSN: 1521-4109
1040-0397
DOI: 10.1002/elan.200703869
Popis: A solid-state electrochemical application of the H-point standard addition method (HPSAM) for quantifying two electroactive compounds, A, B, that produce strongly overlapped voltammetric peaks is described. It is based on peak current measurement in square-wave voltammograms recorded for solid samples containing a reference compound R, upon additions of a A- (or B-) containing standard compound. The method allows to the determination of the mass fraction of A and B by applying the H-point standard addition method to solid state voltammetry. The quotients between the currents measured at two selected potentials and the peak current of R vary linearly with the mass ratio of the added standard and the reference compound, thus providing an electrochemical method for determining the content of A and B in the sample avoiding matrix effects. The method is applied to the simultaneous determination of alizarin and purpurin in madder pigments and pictorial specimens using morin as a reference material.
Databáze: OpenAIRE
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