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KINETIC PHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF RUTHENIUM INDICATED BY THE OXIDATION OF TOLUIDINE BLUE WITH POTASSIUM PERIODATE

Yang Xiao, Zuguang Li

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Abstract

A new catalytic photometric method for the determination of ruthenium based on its catalytic effect on the oxidation of toluidine blue (TB) by KIO 4 in H 3PO 4 medium was reported. A linear relationship was obtained between the reaction rate and the concentration of Ru(Ⅲ) in the range of 0～0.050μg/25ml. The detection limit was 5.53×10 -5 μg·ml -1 . The relative standard deviation for the determination of 0.030μg/25ml of Ru(Ⅲ) was 2 0% ( n =11). The catalytic reaction was found to be of first order for both Ru(Ⅲ) and TB with the appearent activation energy of 50.26kJ·mol -1 . Test for the interferences of more than 40 foreign ions showed that most of the common ions were tolerable. The method has been applied to the determination of trace amounts of ruthenium in some ores and metallurgical products giving RSD′s in the range of 2.1%～2.4% and recoveries in the range of 100 1%～105.4%.

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What this paper is about

A new catalytic photometric method for the determination of ruthenium based on its catalytic effect on the oxidation of toluidine blue (TB) by KIO 4 in H 3PO 4 medium was reported. A linear relationship was obtained between the reaction rate and the concentration of Ru(Ⅲ) in the range of 0～0.050μg/25ml. The detection limit was 5.53×10 -5 μg·ml -1 . The relative standard deviation for the determination of 0.030μg/25ml of Ru(Ⅲ) was 2 0% ( n =11). The catalytic reaction was found to be of first order for both Ru(Ⅲ) and TB with the appearent activation energy of 50.26kJ·mol -1 . Test for the interferences of more than 40 foreign ions showed that most of the common ions were tolerable. The method has been applied to the determination of trace amounts of ruthenium in some ores and metallurgical products giving RSD′s in the range of 2.1%～2.4% and recoveries in the range of 100 1%～105.4%.

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Available abstract

A new catalytic photometric method for the determination of ruthenium based on its catalytic effect on the oxidation of toluidine blue (TB) by KIO 4 in H 3PO 4 medium was reported. A linear relationship was obtained between the reaction rate and the concentration of Ru(Ⅲ) in the range of 0～0.050μg/25ml. The detection limit was 5.53×10 -5 μg·ml -1 . The relative standard deviation for the determination of 0.030μg/25ml of Ru(Ⅲ) was 2 0% ( n =11). The catalytic reaction was found to be of first order for both Ru(Ⅲ) and TB with the appearent activation energy of 50.26kJ·mol -1 . Test for the interferences of more than 40 foreign ions showed that most of the common ions were tolerable. The method has been applied to the determination of trace amounts of ruthenium in some ores and metallurgical products giving RSD′s in the range of 2.1%～2.4% and recoveries in the range of 100 1%～105.4%.

Key concepts: Potassium periodate, Ruthenium, Chemistry, Catalysis, Detection limit, Toluidine, Trace Amounts, Periodate

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KINETIC PHOTOMETRIC DETERMINATION OF TRACE AMOUNTS OF RUTHENIUM INDICATED BY THE OXIDATION OF TOLUIDINE BLUE WITH POTASSIUM PERIODATE — Research Paper | ScholarLens