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- W2499896323 abstract "A new method is proposed for the extraction of Os(VIIl) from its acidic solution with O.OlM Bis-zethylhexyl phosphoric acid (HDEHP). The metal ion from the loaded organic phase is stripped with mixture of thiourea and HCl and then determined by the thioerea method. The method is simple and can be used for the selective extraction and separation of osmium from other metal ions. Various methods have been used for the determination of osmium in different samples including spectrophotometry 1 - 4, polarography), potentiometry and ICPAESo. Most of the extractants were found to be active in acidic range?:. Recently, a spectrophotometric method III for the determination of osmium is reported where its catalytic effect on oxidation of gallocyanine by peroxide has been studied. Among the organophosphorus reagents, undiluted TBP (100%) was found to extract 95% of osmium and it increased to 98% when 3N HBr was used. A mixture of mono- and di-alkyl phosphoric acid was taken to. find their synergistic effect on osmium extraction and it was observed to be 95%. Kan Kimura!' reported 90% extraction of osmium after systematic study with HCI04 concentration ranging from 0.01 to 1.0M and 1M HDEHP in toluene. Since osmium is usually present in ores at low concentrations reasonably sensitive methods are required for its determination. The present paper describes the quantitative extraction of Os (VIII) from acid media with HDEHP. Various other parameters, viz., amount of metal loading, HDEHP concentration, effect of various diluents and stripping agents were studied in detail. Experimental procedure=Bis- 2 ethylhexyl phosphoric acid (HDEHP) was procured from Dai-hachi Chemical Industries Ltd, Japan and used without further purification. All other chemicals used were of analytical grade. Stock solution of osmium tetroxide was standardised by taking 25mL" @default.
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- W2499896323 date "1997-01-01" @default.
- W2499896323 modified "2023-09-24" @default.
- W2499896323 title "Solvent extraction and separation studies of osmium (VIII) with Bis-2 ethylhexyl phosphoric acid" @default.
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