Linear regression analysis of potentiometric titration data for asymmetric redox reactions

B. M. Mar'yanov, M. A. Gavrilenko

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A statistical method is proposed for treating potentiometric titration curves for homogeneous asymmetric redox reactions. The method is based on the use of a mathematical model for the transformation of the branch of a titration curve in the region of potentials of a reversible redox couple into a linear regression characteristic whose slope numerically coincides with the equivalent titrant volume to an accuracy of the LS estimation. The method was verified in the model titrimetric system Mohr's salt-K2Cr2O7 and used for determining tellurium in an individual solution, in a semiconductor CdTe alloy, and in a CdTe ceramic. The random error in the estimation of the equivalence point by the data of a separate titration of 0.1-0.01 M solutions does not exceed 0.3%. In the case of titration of a 0.001 M solution, this error increases to 1.2%. The value of RSD varies from 0.06 to 0.7%.

Original languageEnglish
Pages (from-to)508-513
Number of pages6
JournalJournal of Analytical Chemistry
Volume52
Issue number6
Publication statusPublished - Jun 1997

ASJC Scopus subject areas

  • Analytical Chemistry

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