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solvent extraction

phosphoric acid

organic phase

acid solution

Analytical Sciences

The mechanism for extracting bismuth(III) from an HNO3 aqueous solution into a trioctylmethylammonium nitrate (TOMA*NO3) xylene solution was studied at 25° C. The distribution ratio of bismuth(III) was measured as functions of the bismuth(III) concentration and the HNO3 concentration in aqueous solution, and the TOMA*N03 concentration in xylene. By taking into consideration the dimerization of TOMA’NCb in xylene, the extraction equilibrium of bismuth(III) from nitric acid was determined to be $$Bi_{aq}^{3 + } + 3NO_{3,aq}^ - + 1.5{\left( {TOMA \cdot N{O_3}} \right)_{2,org}}{\left( {TOM{A^ + }} \right)_3} \cdot Bi\left( {N{O_3}} \right)_{6,org}^{3 - }.$$ The conditional extraction constant from 1 M H2SO4 was obtained as log Kex=4.2.

Extraction Mechanism of Bismuth(III) with Trioctylmethylammonium Nitrate