Solvent-extraction studies of phosphonium salts and their analytical applications—IV Separation and determination of platinum

Removal of platinum from water by precipitation or liquid–liquid extraction and separation from gold using ionic liquids

“…2, which is in perfect agreement with previous reports dealing with the UV-Vis absorption of Pt(SCN) 6 2− anions in water. 31 UV-Vis spectra for the three complexes mentioned above are plotted in Fig. 2.…”

“…The results reported here for PtBr 6 2− are higher than almost every value reported previously. 31 The fact that for the same ionic liquid, PtBr 6 2− is extracted better than PtCl 6 2− , is not common using classical organic extractants. Previous results have shown that using HBr, thus producing the PtBr 6 2− complex, instead of HCl decreased significantly the extraction of platinum(IV) from water.…”

The Separation of Rhodium and Iridium. I. Active Centra and the HCl Effect

“…These extractants operate via onium formation in HCl media to extract the chloroanionic species. A large variety of cationic separating agents like trioctylamine, [9] arsonium, [10] and phosphonium [11] salts were also applied. [7,8] These, perhaps except for the sulfoxides, were suspected to react via S to metal coordination.…”

Spectrophotometric Determination of Platinum with 3,4-Diaminobenzoic Acid.

“…At that time, the tin(II) chloride (3) and the p-nitrosodimethylaniline (IS) methods were preferred. Since February 1964, three new spectrophotometric methods for platinum have appeared (6, 11, 16), but have not yet been subjected to the test of time and critical evaluation. Because relatively few spectrophotometric procedures for platinum have been published, more work in this field was desirable.…”