University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Website: @unf

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Classification: Geological -> ore -> slag

Citations 1

"Studies On Flow Injection Analysis Of Platinum Metals. 3. Ruthenium(III) - Potassium Periodate - α-naphtholphthalein System"
Fenxi Huaxue 1989 Volume 17, Issue 3 Pages 212-216
Cai, Y.;He, X.;Chen, X.G.;Hu, Z.D.

Abstract: For determination of Ru in refined ore or chlorinated slag, a 1-g sample was fused successively with 4 g of Na2CO3 - MgO (3:1) and 7 g of Na2O2. The melt was extracted with water, the solution was acidified with H2SO4 (1:1) and, after addition of 20 mL of 30% H2O2, OsO4 was selectively distilled off. The residue was treated with 10 mL of saturated KMnO4 solution before distillation of RuO4, which was absorbed in a mixture of 10 mL of 12 M HCl and 0.2 mL of ethanol and then reduced to Ru(III) by NaBH4. The solution was diluted with water to 100 ml, and a 0.1 mL portion was injected into a carrier stream of water at 80°C to react with 1 mM KIO4 and 0.2 mM α-naphtholphthalein (I) in 0.2 M Na2B4O7 - 0.2 M NaOH buffer medium of pH 10; spectrophotometric detection was at 640 nm and involved measuring the discharge by Ru(III) of the color of the KIO4-oxidation product of I. Recoveries were 103 to 106%, the coefficient of variation was 0.8 to 1.1%, and the detection limit was 0.01 µg mL-1 of Ru(III). Up to 65 injections could be made in 1 h.
Ruthenium(III) Sample preparation Spectrophotometry Heated reaction Indirect