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

Autor:	S. P. Mushtakova, N. A. Burmistrova, E. V. Kapustina
Rok vydání:	2006
Předmět:	chemistry.chemical_classification Chemistry Inorganic chemistry Kinetics Periodate chemistry.chemical_element Sulfonic acid Analytical Chemistry Catalysis Rhodium chemistry.chemical_compound Ionic strength Iridium Platinum
Zdroj:	Journal of Analytical Chemistry. 61:284-288
ISSN:	1608-3199 1061-9348
DOI:	10.1134/s1061934806030166
Popis:	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).
Databáze:	OpenAIRE
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