Original scientific paper

Simultaneous Determination of Palladium(II) and Gold(III) in Mixtures by Third Derivative Spectrophotometry Using 3-Hydroxy-2-methyl-1-phenyl-4-pyridone Ligand

Vlasta Vojković ; Laboratory of Analytical Chemistry, Faculty of Science, University of Zagreb, Strossmayerov trg 14, 10000 Zagreb, Croatia
Vinka Drušković ; Laboratory of Analytical Chemistry, Faculty of Science, University of Zagreb, Strossmayerov trg 14, 10000 Zagreb, Croatia

Abstract

A spectrophotometric method has been developed for the determination of microgram amounts of palladium(II). The method is based on the extraction of palladium(II) by a chloroform solution containing 3-hydroxy-2-methyl-1-phenyl-4-pyridone (HX). Palladium(II) was highly extracted with HX from aqueous sulphuric acid media. The extraction took place in the pH range 1.5–3.0. The chloroform layer was applicable for the spectrophotometric determination of palladium( II). Molar absorptivity was 1.89 × 104 mol–1 dm3 cm–1 at 345 nm. Use of the third-derivative spectrophotometry enables determination of palladium(II) and gold(III) in their mixture without previous separation. Palladium(II) was thus determined in the concentration range 0.28–8.0 µg cm–3 (in the presence of 1.0–8.0 µg cm–3 gold), and gold(III) was determined in the range 1–13.0 µg cm–3 (in the presence of 1–5 µg cm–3 of palladium). The method was successfully applied for the determination of palladium in synthetic mixtures and in Pd-charcoal.

Keywords

extraction; third-derivative spectrophotometry; gold; 3-hydroxy-2-methyl-1-phenyl-4-pyridone; palladium

Hrčak ID:

103076

URI

https://hrcak.srce.hr/103076

Publication date:

30.4.2003.

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