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Journal of Analytical Chemistry

, Volume 61, Issue 3, pp 284–288 | Cite as

Differential catalytic determination of iridium(IV) and rhodium(III) based on the oxidation of N-methyldiphenylamine-4-sulfonic acid

  • E. V. Kapustina
  • N. A. Burmistrova
  • S. P. Mushtakova
Articles

Abstract

The kinetics of the oxidation of N-methyldiphenylamine-4-sulfonic acid with periodate ions was studied in weakly acidic solutions in the presence of iridium(IV), rhodium(III), and their mixtures. Oxidation rate constants were determined in the presence of individual catalysts and their mixtures. The synergetic effect of iridium(IV) and rhodium(III) on the rate of the indicator reaction was estimated; the range of catalyst ratios for the simultaneous determination of analytes was determined. The effect of some factors (oxidant nature and concentration, temperature, the ionic strength of solution, and interfering ions) on the rate of the indicator reaction in the presence of iridium(IV) and rhodium(III) mixtures was assessed. A procedure for the differential catalytic determination of iridium(IV) and rhodium(III) was proposed and tested in the analysis of artificial mixtures and a platinum concentrate of complex composition (KP-5).

Keywords

Oxidation Platinum Ionic Strength Acidic Solution Oxidation Rate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Pleiades Publishing, Inc. 2006

Authors and Affiliations

  • E. V. Kapustina
    • 1
  • N. A. Burmistrova
    • 1
  • S. P. Mushtakova
    • 1
  1. 1.Department of ChemistrySaratov State UniversitySaratovRussia

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