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5692317 
Journal Article 
Separation of rhodium from ruthenium and iridium by fast solvent-extraction with HDEHP 
Yan, GL; Alstad, J 
1995 
Yes 
Journal of Radioanalytical and Nuclear Chemistry
ISSN: 0236-5731
EISSN: 1588-2780 
Kluwer Academic Publishers 
BUDAPEST 
196 
2 
287-293 
English 
WOS:A1995TG86300009 
Solvent extraction of rhodium, ruthenium and iridium with di(2-ethylhexyl)phosphoric acid (HDEHP) has been investigated. Under the conditions [Cl−1]=0.20M, [(HDEHP)2]=0.30M, pH 4.05, phase contact time 1 minutes, Rh(III) is extracted 90.7%, Ru(III) and Ir(III) 20.0% and 11.5%, respectively, at phase ratio 1∶1. The distribution ratio of rhodium is proportional to [(HDEHP)2]3 for a freshly prepared aqueous phase with low chloride concentration but might drop to [(HDEHP)2]1to2 for an aqueous phase high in chloride concentration and after standing. The spectroscopic studies indicate that the extracted compound of rhodium is Rh(H2O)6−x Cl x [H(DEHP)2]3−x (x=0, 1, 2). 
bis(2 ethylhexyl)phosphonic acid; iridium; rhodium; ruthenium; unclassified drug; article; drug mixture; extraction; methodology; ultraviolet spectrophotometry