Distribution of Cd (II) Between Buffered Aqueous Solutions and Chloroform Solution of 4,4´-(1e,1e´)-1,1´-(ethane-1,2-diylbis(azan-1-yl-1ylidene)bis(5-methyl-2-phenyl-2,3-dihydro-1h-pyrazol-3-ol) (H2BuEtP)

Abstract

The distribution of Cd(ll)  between buffered aqueous solutions and chloroform solution of 4,4´-(1e,1e´)-1,1´-(ethane-1,2-diylbis(azan-1-yl-1ylidene)bis(5-methyl-2-phenyl-2,3-dihydro-1h-pyrazol-3-ol) (H₂BuEtP)  and the effect of  1-(3-hydroxy-5-methyl-2-phenyl-2,3-dihydro-1h-pyrazol-4-yl) butan-1-one (HBuP) as a synergist in the distribution was studied. The concentration of Cd (ll) in aqueous phase after shaking was determined with an Atomic Absorption Spectrophotometer at wavelength   of 228nm and the distribution   determined by difference. pH 4. 75 - 7.5 was the range in which > 90% distribution of cadmium into organic phases occurred. Slope analysis was used to predict the probable extraction reactions and also the distributing cadmium complexes as Cd(HBuEtP)X and Cd(HBuEtP.BuP)  respectively. HBuP slightly increased the pH_1/2   from 3.87  ± 0.18  to 4.88  ± 0.12 and partition  coefficient K_D  from  2.19  ±  0.35  to 3.15  ±  0.42.  However, the extraction constant K_ex2Cd ((-10.09 ± 0.09) in the presence of HBuP was < K_ex1Cd (-3.01± 0.9) for H₂BuEtP alone. It was recommended that kinetics studies and effect of acids, anions and auxiliary complexing agents on the distribution of cadmium be investigated to fully evaluate the potentials of H₂BuEtP in the extraction   of cadmium from aqueous media.