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2002•Chinese Journal of Spectroscopy LaboratoryRequires access

Determination of Trace Rhodium(III) by Catalytic Kinetic Spectrophotometry with Potassium Periodate

Bo Yang

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Abstract

Based on the catalytic effects of rhodium(Ⅲ) on the oxidation reactions of dimethyl yellow by KIO 4 in the H 3PO 4 medium, a new catalytic spectrophotometric method has been developed for the determination of rhodium(Ⅲ). The good linear relationship has been obtained in the concentration range of Rh(Ⅲ) over 0-4 0μg/25mL with a detection limit of 4 71×10 -10 g/mL. The relative standard deviation for the determination of Rh(Ⅲ) at the concentration of 2 0μg/25mL was calculated as 1 43%( n =11). The apparent activation energy of this reaction is 125 8kJ/mol. The method has been successfully applied to the determination of rhodium(Ⅲ) in catalysts and platinum metal samples.

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What this paper is about

Based on the catalytic effects of rhodium(Ⅲ) on the oxidation reactions of dimethyl yellow by KIO 4 in the H 3PO 4 medium, a new catalytic spectrophotometric method has been developed for the determination of rhodium(Ⅲ). The good linear relationship has been obtained in the concentration range of Rh(Ⅲ) over 0-4 0μg/25mL with a detection limit of 4 71×10 -10 g/mL. The relative standard deviation for the determination of Rh(Ⅲ) at the concentration of 2 0μg/25mL was calculated as 1 43%( n =11). The apparent activation energy of this reaction is 125 8kJ/mol. The method has been successfully applied to the determination of rhodium(Ⅲ) in catalysts and platinum metal samples.

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Available abstract

Based on the catalytic effects of rhodium(Ⅲ) on the oxidation reactions of dimethyl yellow by KIO 4 in the H 3PO 4 medium, a new catalytic spectrophotometric method has been developed for the determination of rhodium(Ⅲ). The good linear relationship has been obtained in the concentration range of Rh(Ⅲ) over 0-4 0μg/25mL with a detection limit of 4 71×10 -10 g/mL. The relative standard deviation for the determination of Rh(Ⅲ) at the concentration of 2 0μg/25mL was calculated as 1 43%( n =11). The apparent activation energy of this reaction is 125 8kJ/mol. The method has been successfully applied to the determination of rhodium(Ⅲ) in catalysts and platinum metal samples.

Key concepts: Potassium periodate, Rhodium, Chemistry, Catalysis, Detection limit, Spectrophotometry, Platinum, Inorganic chemistry

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