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Spectrophotometric determination of the platinum metals. VI. Determination of rhodium and palladium with 4-(2-thiazolylazo)resorcinol in the presence of cation-active tensides

A. Műllerová and L. Čermáková

Department of Analytical Chemistry, Faculty of Natural Sciences, Charles University, 128 40 Prague

 

Abstract: The reactions of platinum-group metals with azo dyes were studied by using 4-(2-thiazolylazo)resorcinol. The effect of cationic surfactants was also studied. The formation of a binary complex of Rh(III) with the dye (pH 5.0; λ = 520 nm, ε' = 3.22 × 104 mol-1 1 cm-1) and of ion assocs. of complexes of Rh(III) (pH 5.6, λ = 545 nm; ε' = 3.75 × 104 mol-1 1 cm-1) and Pd(II) (pH 5.0; λ = 540 nm; ε' = 3.02 × 104 mol-1 1 cm-1) in the presence of the micelle form of cetylpyridinium bromide formed the basis for developing methods for spectrophotometric detg. the metals (0.5-3.6 μg Rh(III) ml-1; Sandell sensitivity S = 3.3 × 10-3 and 2.9 × 10-3 μg cm-2 for the binary complex and the ion assoc., resp.; 0.5-3.2 μg Pd(II) ml-1; S = 3.7 × 10-3 μg cm-2).

Full paper in Portable Document Format: 355a651.pdf

 

Chemical Papers 35 (5) 651–659 (1981)

Thursday, May 19, 2022

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