Abstract
A chemometric approach to the determination of the components of a redox couple without their preseparation was proposed. The approach is based on the transformation of a potentiometric curve obtained by the multiple addition method to a direct regression line with a cotangent numerically equal to the analyte concentration. The approach was tested on simulated and experimental data for the reversible Fe(III)–Fe(II) system and applied to the determination of Cr(VI) in model solutions using excess solution of the Mohr's salt as an auxiliary reducing agent. In real determinations of Fe(III, II) and Cr(VI) in concentration ranges from 1 × 10–3to n× 10–5and from 2 × 10–3to 5 × 10–4M, RSD varied from 0.2 to 8% and from 3 to 12%, respectively.
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REFERENCES
Bykova, L.N. andAkhmad'yarova, D.I., Book of Abstract, Noveishie dostizheniya v oblasti elektrokhim. metodov analiza: Rossiiskaya elektrokhimicheskaya shkola (Newest Achievements in Electroanalytical Methods: Russian Electrochemical School), Tambov, 1995, p. 74.
Vlasov, Yu.G.,Kolodnikov, V.V.,Ermolenko, Yu.E., andMikhailova, S.S., Zh. Anal. Khim., 1996, vol. 51, no. 8, p. 805.
Shul'ts, M.M.,Pisarevskii, A.M., andPolozova, I.P., Okislitel'nyi potentsial (Oxidation Potential), Leningrad: Khimiya, 1984.
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Mar'yanov, B.M., Ekel'chik, I.V. A Chemometric Approach to the Indirect Potentiometric Determination of the Components of a Redox Couple. Journal of Analytical Chemistry 56, 635–640 (2001). https://doi.org/10.1023/A:1016740221677
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DOI: https://doi.org/10.1023/A:1016740221677