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Surfactant Gel Adsorption of platinum(II), (IV) and palladium(II) as Chloro-Complexes and Kinetic Separation of Palladium From Platinum Using EDTA

Surfactant Gel Adsorption of platinum(II), (IV) and palladium(II) as Chloro-Complexes and Kinetic Separation of Palladium From Platinum Using EDTA

Yoshiko Murakami, Kaoru Hiraiwa, Yoshiaki Sasaki, Isamu Fujiwara, Shoji Tagashira

Anal Sci. 2007 Sep;23(9):1147-9.

PMID: 17878594

Abstract:

A micellar solution of cetylpyridinium chloride (CPC) can separate into two phases due to a temperature change or to the addition of salts. Platinum(II), (IV) and palladium(II) reacted with chloride ions to form stable anionic complexes of PtCl4(2-), PtCl6(2-) and PdCl4(2-), respectively, and were adsorbed onto the CPC gel phase. The CPC phase plays the role of an ion-exchange adsorbent for the anionic complexes. By such a procedure, the precious metals of platinum and palladium could be separated from base metals such as copper, zinc and iron. The kinetic separation was performed by a ligand exchange reaction of the palladium(II) chloro-complex with EDTA at 60 degrees C. The anionic palladium(II)-EDTA complex could not bind the opposite charged CP+ and was desorbed from the CPC phase. In the aqueous phase, the recovery of palladium(II) by the double-desorption was 101.1 +/- 1.2%. The platinum(II) and (IV) chloro-complexes were stable for at least 30 min and remained in the CPC phase.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP15020992	(Ethylenediamine)palladium(II) chloride		15020-99-2	Price

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