SOLVENT EXTRACTION EQUILIBRIA OF GALLIUM (III) WITH ACIDIC ORGANOPHOSPHORUS COMPOUNDS FROM AQUEOUS NITRATE MEDIA |
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| Authors: | Katsutoshi Inoue Yoshinari Baba Kazuharu Yoshizuka |
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| Affiliation: | Department of Applied Chemistry , Saga University , Honjo-machi, Saga, 840, Japan |
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| Abstract: | A comparative investigation on the solvent extraction equilibria of gallium(III) from aqueous nitrate media was conducted with three kinds of acidic organophosphorus compounds, di (2-ethylhexyl) phosphoric acid (D2EHPA), 2-ethylhexyl 2-ethyl-hexylphosphonic acid (EHEHPA) and di (2,4,4'-trimethylpentyl) phosphinic acid (DTMPPA), in toluene at 303 K. It was found that gallium(III) is extracted as 1:4 metal:reagent complexes with D2EHPA and EHEHPA and as a 1:3 complex with DTMPPA in the region of low loading ratio while it is extracted as 1:3 complexes with all reagents at high loading ratio. The extraction equilibrium constants with these extractants were evaluated for the former complexes as follows: Ke = 2.3xl0-2, 8.5xl0-3 and 1.3xl0-4 for D2EHPA, EHEHPA and DTMPPA respectively. |
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| Keywords: | 2,6‐di(5,6‐diethyl‐1,2,4‐triazin‐3‐yl)pyridine 2,6‐di(5,6‐dipropyl‐1,2,4‐triazin‐3‐yl)pyridine Fe(II), Cu(I,II), In(III), Y(III), Nd(III), and Lu(III) extraction |
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