Sensitive amperometric titration of o-phenylenediamine employing catalytic electrode reaction end-point detection

E. Kirowa-Eisner, Harry B. Mark

Research output: Contribution to journalArticlepeer-review

Abstract

The catalytic prewave of the Ni-opda system has been used for a sensitive amperometric detection of the end-point of the opda titration. Au(III) was chosen as titrant from a large group of possible oxidants, because of its favourable equilibrium and kinetic properties. Three end-points are observed in the titration and the reactions involved were shown to be as follows: {A figure is presented} {A figure is presented}. The limiting sensitivity for the determination of opda was found to be 1·10-6 M, with a standard deviation of 4.6%. The titration of opda was not feasible in the presence of the other phenylenediamines. The catalytic electrode reactions involving cyclic regeneration of the redox species, are applicable for end-point detection systems for the amperometric titrations of trace concentration of these species, provided titrants can be found that have suitable thermodynamic and kinetic properties in their reaction with the redox species.

Original languageEnglish
Pages (from-to)397-404
Number of pages8
JournalJournal of Electroanalytical Chemistry
Volume16
Issue number3
DOIs
StatePublished - Mar 1968
Externally publishedYes

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