Abstract
A method for the gravimetric determination of palladium with 2-hydroxy-1-naphthaldoxime (HNA) has been studied. Palladium is quantitatively precipitated from fairly acidic solution as a sparingly soluble complex with HNA. The precipitate dried at 110°C is confirmed to be Pd (HNA)2 by elemental analysis and the gravimetric factor for palladium is 0.2222. The recommended procedure is as follows: Thirty five ml of 0.5 % HNA in methanol is added to 15 ml of a sample solution containing (525) mg of palladium and acidified with hydrochloric acid to (0.51.5)N. The solution is allowed to stand for 1 h with stirring at room temperature. The yellow precipitate thus obtained is filtered off on a G-4 sintered glass crucible, washed first with a mixture of hydrochloric acid (0.2 N) and methanol (70%) and then with methanol to remove the excess reagent, and dried at 110°C to constant weight. The method can successfully be applied to the determination of palladium in brazing filler metal.
