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The extraction of zinc with 3-methyl-2 (1H)-quinoxalinethione ( ) LH , is investigated in nitrate solution as a function of pHrange 2-6, and analytical concentrations of − 3 NO anions ( ) 3 NO C and extractant ( ) LH C . The extraction mechanism with LH , is determined on the basis of the variation of the distribution coefficient D with pH, 3 NO C and LH C . As a result, the partition equilibrium involves complexing phenomenon, ion-pair formation, and 1H+ exchange reaction. The overall extraction constants are logK01.5 = 5.1, and logK11.5 = -0.6. The extraction complexes are found to be 2 3 2 ) (NO ) Zn(LH + l l , and ) (NO (LH) Zn(L) 3 1 l with l = 1 or 2. The hydrolysis reaction of Zn(II) is evaluated and it is found that it results in the formation of 2aq Zn(OH) and Zn(OH) + species, at pH >5.6. Zinc shows maximum percent extraction (75%) with the pH 4.7 at low organic ligand concentration (0.01M).

Liquid-liquid Extraction of Zinc by 3-methyl-quinoxaline-2-thione from Nitrate Medium