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Contents • Introduction • Preparation of Extraction columns • Results • Conclusion HYDROMETALLURGY SEMINAR, MARCH 2015 Introduction Extraction chromatography: • Combination: – Selectivity of liquid-liquid extraction – Multistage character & rapidity of chromatographic processes • Extractant is adsorbed on the surface of an inert support • Separation of the metals is based on the distribution of the cations of interest between an organic and an aqueous phase Include the possibility to use mineral acid as mobile phase Amount of organic compound (ligand) required in extraction chromatography is significantly low http://www.triskem-international.com/full_extraction_chromatographie.asp HYDROMETALLURGY SEMINAR, MARCH 2015 Introduction General parameters of Stationary phases: • Physical stability – Selection of suitable support – Eluent parameters • Chemical stability – Composition of stationary phases change • Light, temperature & nuclear radiation – Possible unwanted redox reactions with stationary phases TBP strongly hydrolyses in the column, when column left as such after using conc. acids • Regeneration of stationary phases • Repeatability & reproducibility HYDROMETALLURGY SEMINAR, MARCH 2015 Preparation of columns Extractants dissolved in Methanol:water (55:45) Solution is Columns Column is passed washed with ready for through 0.1 M HNO separation columns 3 Metals can be Separated separated metals using diluted detected by minerls acid ICP-MS or under gradient UV/Vis after or isocratic PCR elution HYDROMETALLURGY SEMINAR, MARCH 2015 Separation Principle Mobile phase RE(III) ic l hi p o r yd h RE(III) ic il h p o r d y h c i ) b II I o E( h R p o r d c y i l H phi o c r i d b y o h h p o r d y H c bi pho o ydr RE(III) H c li i ph o r d y h ic b o h p o r yd H Silica bonded with C18 c RE(III) i l phi o dr y c h bi pho o dr y H HYDROMETALLURGY SEMINAR, MARCH 2015
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