Spectrophotometric determination of palladium by extraction of its

A new method is proposed for naphthalene extraction and spectrophotometric determination of palladium at the ppm level with chinoform. The method is based on the formation of a yellow complex which is extractable by molten naphthalene and on the dissolution of the extract in dioxane. The yellow solution follows Beer's law at 462 nm over ~he range of 7 to 140 ~g of palladium per 10 ml of dioxane.· The colour of the complex is stable for 80 min. The method is accurate and reproducible to within 1.3 %, and it has more high sensitivity than chloroform method. The molar absorptivity is calculated to be 1.3 x 10 3 -1 -1 2 mol·l ·cm ,the sensitivity being 0.014 Mg cmof palladium for the absorbance of 0.001. The other factors such as optimum wavelength, pH, amounts of reagent and naphthalene, digestion time, etc. are studied.