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 -> concentrate

Citations 2

"Spectrophotometric Determination Of Micro Amounts Of Palladium By Flow Injection Analysis"
Fenxi Huaxue 1989 Volume 17, Issue 3 Pages 248-250
Chen, X.G.;Liu, M.;Hu, Z.D.

Abstract: A 0.1-g sample of secondary ore concentrate is dissolved in aqua regia, the solution is evaporated almost to dryness, the residue is evaporated twice with 2 mL portions of HCl, and the residue is dissolved in 10% HCl to 100 mL. An aliquot is suitably diluted with 2% H2SO4, and a 100 µL portion is injected into a carrier stream of 2% H2SO4 (1.5 mL min-1) to react with either 0.05% 5-Cl-PADAB [4-(5-chloro-2-pyridylazo)-m-phenylenediamine; I] in 50% ethanol in a 90-cm reaction coil for detection at 594 nm or with 0.05% 5-Br-PADAP [2-(5-bromo-2-pyridylazo)-5-diethylaminophenol; II] in 50% ethanol in a 72-cm reaction coil for detection at 609 nm. In the determination of 1 to 2 µg mL-1 of Pd, recovery was 93 to 96% and the relative error was 5%. The rectilinear range is 0 to 3 µg mL-1 of Pd for I and 0 to 7 µg mL-1 for II; detection limits are 0.05 µg mL-1 for I and 0.1 µg mL-1 for II. Tolerance levels of co-existing ions are tabulated.
Palladium Sample preparation Spectrophotometry Interferences

"Catalytic Determination Of Osmium By Using Flow Injection Analysis"
Huaxue Tongbao 1988 Volume 51, Issue 10 Pages 41-42
He, X.;Cai, Y.;Gong, H.;Hu, Z.D.

Abstract: The aqueous sample solution, 4 mM KIO3 plus 0.2 M Na2B4O7 - 0.2 M NaOH (pH 9 to 11.5), and 0.2 mM α-naphtholphthalein were separately injected into a mixing coil at 80°C and the mixture then passed to a detector unit. The recorded peak voltage was rectilinearly related to Os concentration. between 0.01 and 0.12 µg mL-1 under the specified operating conditions. Tolerance levels for 16 cations are listed; Ru(III), Rh(III), Ir(IV) and Mn(II) interfered and needed to be separated before analysis. Recoveries for an ore concentrate and a chloride sediment containing ~4 kg t-1 and 0.5 kg t-1 of Os, respectively, were 96 to 100.5%.
Osmium Spectrophotometry Catalysis Heated reaction Interferences