Author(s)

Onyedika Gerald, Arinze Judith, Ogwuegbu Martin

Department of Industrial Chemistry, Abia State University, Uturu, Nigeria.
Mineral Processing Unit, Department of Chemistry, Federal University of Technology, Owerri, Nigeria.

The extraction of Cobalt(II) from aqueous solution using 1-phenyl-3-methyl-4-(p-nitrobenzoyl)pyrazolone (HPMNP) in various organic solvents was studied as a function of pH and extractant concentration. Extraction into organic chloroform phase was more efficient than with any other solvent. The extraction equilibrium constant was found to be log K_ex= -7.04. Optimum conditions for extraction of Co(II) exist at pH of between 5.5 and 7.0, ionic strength of 0.3 Mand constant extractant concentration of 0.02 M. Shaking the organic Co(II) chelate complex with 0.2 Macid strips the Co(II) ions into the aqueous phase. It was established that Co(II) complex extracted is of composition, Co(PMNP)₂.

Extraction; Solvent; Complex; Pyrazolones

O. Gerald, A. Judith and O. Martin, "Studies on Extraction Behaviour of Cobalt(II) with Nitrobenzoylprazolone-5," Journal of Minerals and Materials Characterization and Engineering, Vol. 1 No. 3, 2013, pp. 90-94. doi: 10.4236/jmmce.2013.13017.