The use of alkylaniline in extraction-instrumental methods for platinum metal determination

The application of n-alkylaniline for group extraction concentration of platinum metals (PM) (PM=Pd, Pt, Rh, Ir, Ru) for purposes of their subsequent determination by the methods of atomic-absorptional and atomic-emission spectroscopy is considered. It is shown that in case of the optimal acidity of aqueous phase 2-3 M HCl quantitative extraction of PM is observed in a wide range of their concentrations (10-6-2x10-2 M). At low concentrations of PM the distribution factor reaches the value 200-250, which permits to carry out multiple concentration of samples, when analyzing depleted ores. The effect of ignoble metals on PM extraction, mutual effect of element in case of their determination in the extracts are discussed, analytic characteristics of extractioninstrumental methods of analysis are given. 4 refs.; 2 tabs