Studies on the catalytic hydrogen wave of rhodium complex with 5-(5-chloro-2-pyridylazo)-2,4-diaminotoluene

Abstract

A highly sensitive method for determing rhodium by catalytic polarog. was established. Rhodium first reacts with 5-(5-chloro-2-pyridylazo)-2,4-diaminotoluene (5-Cl-PADAT) to form a stable complex in a HOAc-NaOAc buffer solution at pH 5. A polarogram was recorded in media of HClO4. The optimum anal. conditions were determine through investigating various influences on on the catalytic wave. Characteristics of the wave were also researched and it is proved that the wave is a catalytic hydrogen wave of the complex of rhodium with 5-Cl-PADAT. An electrode mechanism was proposed and was verified experimental The linearity range of rhodium concentration is 3.9 ?10-12 to 3.9 ?10-9 mol dm-3; the detection limit is 1.9 ?10-12 mol dm-3. The method has been applied to the determination of rhodium in nickel base alloy without any chem. separation; satisfactory results were obtained.

Key words: REACTION MECHANISM, POLAROGRAPHIC ANALYSIS, RHODIUM, PADAB, ELECTRODE REACTION

CLC Number:

O646
O658

Cite this article

ZHANG ZHENYI;ZHANG GUANG;FENG YUANYUAN. Studies on the catalytic hydrogen wave of rhodium complex with 5-(5-chloro-2-pyridylazo)-2,4-diaminotoluene[J]. Acta Chimica Sinica, 1992, 50(11): 1117-1122.

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