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The solvent extraction of cadmium (II) from phosphoric acid 2.5M by 3-methyl-2 (1H)quinoxaline-thione ( C9H8N2S) is investigated in various experimental conditions. Obtained results show a variation of extraction of Cd with pH, and concentration. The conventional methods of slope analysis can’t be performed successfully for understanding interaction mechanisms. A technique combining slope analysis with the variation of overall extraction constant with pH is performed in this case. There is no predominant removal mechanism, cadmium is extracted as complexes in Cd: : H3O +( OH-) stoichiometry varying between 1:1:0 and 1:3:3. The extraction reaction is a complex process including ion exchange-ion pair formation, organic and inorganic complexation, H3PO4 deprotonation and solvatation phenomena. A best recovery of 43 to 60% is achieved in acidic conditions with CLH = 0.26M.

The Solvent Extraction of Cadmium From Phosphoric Acid Solution By3-Methyl-Quinoxaline-2-Thione in Toluene Diluent