Publisher: Chemical Society of Nigeria

Studies On Extraction of Co (II) Ions From Aqueous Solution Using 1,5-Dimethyl- 2- Phenyl-4-[(E)-(2,3,4-TRIHYDROXYLPHENYL)Diazenyl]-1,2-Dihydro-3H-Pyrazol-3-One

P. O Ukoha, N. R. Ekere, I. J. Opara
KEYWORDS: Extraction; cobalt; ligand; H3L; azo; complexation; spectrophotometry

ABSTRACT:

Solvent extraction studies on Co(II) using 1,5-dimethyl- 2- phenyl-4-[(E)-(2,3,4-trihydroxylphenyl) diazenyl]- 1,2-dihydro-3H-pyrazol-3-one (H3L) were carried out using CHCl3 as solvent. The ligand 1,5-dimethyl- 2- phenyl-4-[(E)-(2,3,4-trihydroxylphenyl)diazenyl]- 1,2-dihydro-3H-pyrazol-3-one (H3L) and its Co(II) complex were successfully synthesized and authenticated. Stoichiometric studies indicated that the complex formed by Co (II) with H3L have 2:1 ligand to metal mole ratio. The conductivity test on the ligand and its complex showed that H3L and [Co (H2L)2] are non- electrolytes . Effects of some extraction variables like pH, salting out agents, time and acids were also investigated. Extraction of Co (II) with H3L/CHCl3 was quantitative (91.66%) at pH 10. Also in 10-3 M H2SO4, Co (II) was extracted up to 81.2 % within ten minutes. The result showed that the amount extracted decreased with increase in acid concentration. Na2SO4 and KClO4 proved to be good salting out agents for the extraction of Co (II). The ligand synthesised has high potentials for removal of Co (II) from samples.


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