高量铑或铜铁镍铑共存时铂钯的分离测定

RAPID SEPARATION AND DETERMINATION OF PLATINUM (ANDPALLADIUM) IN THE PRESENCE OF A LARGE AMOUNT OF RHODIUM OR COPPER、IRON、NICKEL AND RHODIUM

针对铑严重干扰D_bDO法测定铂的问题,研究表明,在5～10M盐酸中,当采用碘化钠代替氯化亚锡将Pt(Ⅳ)还原为Pt(Ⅱ)并显色时,铂的有色络合物能与大量铑分离(氯仿萃取).钯可在萃铂前用D_bDO和氯仿分离测定.

The separation and determination of platinum (and palladium) in the presence of a large amount of Rh or Cu, Fe, Ni and Rh is studied in order to overcome the interference of Rh in the determination of Pt by D_bDO method. Lt is shown that a coloured complex of Pt can be separated by extraction with chloroform from a large amount of Rh in 5～10M HC1 with sodium iodide to replace SnCl_2 as reduce agent for Pt(Ⅳ) to Pt(Ⅱ) and as coloure reagent. The separation and determination of Pd are carried out with D_bDO and chloroform prior to the extraction of Pt.