Abstract
Abstract The extraction behavior of cobalt(II) into 1,1,2,2-tetrachloroethane (TCE) with 8-quinolinol (HQ) from an aqueous solution in the presence of various inorganic anions (X−) such as perchlorate, nitrate, and chloride ions was studied themodynamically. The extraction equation can be written as 2Co2++6HQ(o)+X−\ightleftarrowsCo2Q3(HQ)3+(o)+X(o)−+3H+ The ion-pair of the binuclear complex (complex ion-pair) dissociates to a complex cation and an inorganic anion in the organic phase. The extraction constant increases in proportion to the radius of the counter anion. Changes in the enthalpy and entropy are negative for the overall extraction of cobalt with 8-quinolinol. These thermodynamic parameters were compared with those of zinc and cadmium. The temperature effect on the extraction behavior of cobalt with 8-quinolinol was also investigated in a chloroform system for comparison.
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