Abstract
Palladium is precipitated with ammonia and iodide; platinum remains in solution and is completely extracted with dithizone in carbon tetrachloride. The precipitated palladium compound is shown to be Pd(NH 3) 2I 2 by thermogravimetry and by determinations of ammonia and iodide. To separate small amounts of palladium from platinum in the dithizone extract, the resistance of platinum dithizonate to oxidizig agents is utilized; platinum dithizonate is converted to an oxidized form which is easily reduced to the initial form. The separation and spectrophotometric procedure enable about 1 × 10 −3% platinum to be quantified in palladium(II) chloride with good precision and accuracy.
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