Abstract
A sensitive and precise method for the determination of microgram amounts of palladium, based on the ion associate of the anionic palladium(II)-thiocyanate complex with Methylene Blue (MB), has been developed. The ion associate is floated with benzene and dissolved in acetone, and its molar absorptivity is found to be 1.7 × 105 l mol–1 cm–1 at 660 nm. The formation of the ion associate takes place over a wide pH range (1–6). The method is selective; interfering metals include silver, platinum, ruthenium, molybdenum and tungsten. The composition of the ion associate has been established as [MB+]2[Pd(SCN)42–]. The proposed method has been applied to the determination of trace amounts of palladium in high-purity silver after its preliminary separation from the matrix as palladium dimethylglyoximate.
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