EXTRACTION OF PALLADIUM WITH TRI-ISOBUTYLPHOSPHINE SULFIDE (CYANEX-471) IN TOLUENE FROM CHLORIDE SOLUTIONS CONTAINING THIOCYANATE

被引：39

作者：

HIDALGO, M

MASANA, A

SALVADO, V

MUNOZ, M

VALIENTE, M

机构：

[1] UNIV AUTONOMA BARCELONA,E-08193 BARCELONA,SPAIN

[2] UNIV AUTONOMA BARCELONA,COLL UNIV GIRONA,UNITAT QUIM,E-17071 GIRONA,SPAIN

来源：

TALANTA | 1991年 / 38卷 / 05期

关键词：

D O I：

10.1016/0039-9140(91)80167-X

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The extraction of Pd(II) by tri-isobutylphosphine sulphide, TIBPS (Cyanex 471x), in toluene from aqueous chloride solutions (containing small amounts of thiocyanate) has been investigated. The extraction is enhanced by the presence of thiocyanate, owing to formation of mixed-ligand Pd(II)-Cl(-)-SCN(-)-TIBPS complexes. Analysis of the metal distribution suggests the formation of PdCl(SCN).TIBPS, PdCl(SCN).2TIBPS, Pd(SCN)2.TIBPS and Pd(SCN)2.2TIBPS in the organic phase. The equilibrium constants are logK111 = 9.56, logK112 = 12.70, logK121 = 14.73 and logK122 = 17.17, respectively. The ultraviolet absorption spectra of the organic phase support the hypothesis of formation of mixed-ligand complexes.

引用

页码：483 / 488

页数：6

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