Abstract
The extraction of Nickel has been studied as complex with 2-[ (4-Bromo phenyl) azo]-4,5-diphenyl
imidazole which dissolved in chloroform .This search comprises the following aspects: the optimum pH
values for extraction was (pHext. = 9 ), so the suitable concentration of Ni(II) ions in aqueous solution
which is giving highest distribution ratio (D) was (80 μg ) ,studying effect of extraction time illustrated the
optimum shaking time to reach the equilibria was ten minute .It was found from experiments that the
best value of D when the concentration of ligand equal to [3x10-5 M ] , from other hand organic
solvents shows that there is no linear relation ship between dielectric constant of organic solvents and
distribution ratio (D) of extraction ,but there is an effect for the organic solvent structure. The
thermodynamic study demonstrates the complexation reaction is an exothermic at temperature degrees
(20 0C - 70 0C).
imidazole which dissolved in chloroform .This search comprises the following aspects: the optimum pH
values for extraction was (pHext. = 9 ), so the suitable concentration of Ni(II) ions in aqueous solution
which is giving highest distribution ratio (D) was (80 μg ) ,studying effect of extraction time illustrated the
optimum shaking time to reach the equilibria was ten minute .It was found from experiments that the
best value of D when the concentration of ligand equal to [3x10-5 M ] , from other hand organic
solvents shows that there is no linear relation ship between dielectric constant of organic solvents and
distribution ratio (D) of extraction ,but there is an effect for the organic solvent structure. The
thermodynamic study demonstrates the complexation reaction is an exothermic at temperature degrees
(20 0C - 70 0C).
Keywords
Azo
extraction
imidazole.
Nickel
P-BrPAI