Original scientific paper

Solvent Extraction and Separation of Zinc from Copper and Direct Spectrophotometric Determination of Copper (II) by Monooctyl a -Anilinobenzylphosphonate

B. Tamhina ; Laboratory of Analytical Chemistry, Faculty of Science, University of Zagreb
M. J. Herak ; Laboratory of Analytical Chemistry, Faculty of Science, University of Zagreb
V. Jagodić ; Laboratory of Analytical Chemistry, Faculty of Science, University of Zagreb

Abstract

Extraction of copper (II) from diluted hydrochloric, nitric
and sulphuric acid solutions with monooctyl a-anilinobenzylphosphonate
(MOABP) dissolved in chloroform, has been studied.
Copper is quantitatively extracted from the solutions at 4.5 ·< < pH < 6.2. Although zinc is also extracted from diluted mineral
acids, the separation of zinc from a large amount of copper is
feasible in the presence of cyanide.
Copper (II) and MOABP form a stable yellow colored complex,
whose solution in chloroform follows the Lambert-Beer's law. A
procedure for rapid spectrophotometric determination of copper
has been developed. The influence of various cations and anions
on the absorbance of the complex has been investigated.
The ratio of copper to MOABP · in the extractable complex
has been established spectrophotometrically, and from the dependence
of the copper distribution ratio on the MOABP concentration
in the organic phase. A MOABP complex having 2 ligand molecules coordinated to the copper ion has been isolated in pure form.

Keywords

Hrčak ID:

197009

URI

https://hrcak.srce.hr/197009

Publication date:

15.4.1974.

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