Determination of palladium in coatings by spectrophotometric method using thiopyrine as a reagent

Goundobin N.V., Titov V.I., Pilipenko L.V.
UDC
620.179
DOI
10.18577/2307-6046-2016-0-11-8-8
Article PDF (Russian) (456.73 KB)
How to cite
Goundobin N.V., Titov V.I., Pilipenko L.V. Determination of palladium in coatings by spectrophotometric method using thiopyrine as a reagent // Proceedings of VIAM. 2016. No. 11. DOI: 10.18577/2307-6046-2016-0-11-8-8. URL: https://test.viam.ru/en/journal/2016/11/8
Keywords
methods, palladium, platinum-palladium coating, spectrophotometric method, acid dissolution, the calibration graph.
Abstract

The possibility of spectrophotometric determination of palladium content (from 0,2 to 2,5 wt. %) in platinum-palladium coatings using thiopyrine reagent is studied. Thiopyrine forms complex compounds with a characteristic absorption band intensely stained (=4,1•104) at maх=335 nm in acid solution with Pd (II) ion. It is established by isomolar series methods that thiopyrine and palladium in 0,1 N H2SO4 medium are included in the complex forming coloration with 1:3 ratio. In order to analyze the platinum-palladium coating was separated from the copper substrate on which it was deposited by dissolving the latter in HNO3 solution (1:1), while the platinum palladium coating remained undissolved. After washing and weighing the coating was dissolved in a mixture of HCl and HNO3 acids (acid ratio of 3:1) under heating. After sample preparation, the optical density of the solution at a wavelength =335 nm with a spectrophotometer PE-5400 was determined. An appropriate concentration of reage

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