Abstract

Sanae Baki Senhaji¹*, Ahmed Elyahyaoui¹, Saidati Boulassa¹ and El Mokhtar Essassi² 

DOI : http://dx.doi.org/10.13005/ojc/320624

The solvent extraction of cadmium (II) from phosphoric acid 2.5M by 3-methyl-2 (1H)-quinoxaline-thione 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 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, H₃PO₄deprotonation and solvatation phenomena. A best recovery of 43 to 60% is achieved in acidic conditions with CLH = 0.26M

Cadmium; extraction; phosphoric medium; pH; 3-methyl-2 (1H)-quinoxaline-thione

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