Ion-Pair Based Solvent Extraction of Rhodium (III) from Malonate Medium Using 4-heptylaminopyridine as an Extractant: Application to Alloys and Environmentally Relevant Matrices

Abstract

The main task of this research article is the extraction and subsequent separation of rhodium(III) from malonate medium (0.02 M) at pH 7.5 by a newly synthesized chelating reagent, 4-heptylaminopyridine(4-HAP). The reagent has been used to build up novel analytical procedure its determination at trace level. During the optimization of the present method, the influence of a variety of parameters like pH of medium, 4-HAP concentration, weak organic acid concentration, organic diluents, shaking time and stripping agents on the extraction of rhodium(III) was studied. From the slope analysis the probable composition of extracted species was found to 1:2:1 (metal: malonate: extractant). The effect of different interfering ions is studied together with the suitable masking agents. The applicability of the method was checked by separating rhodium(III) from binary and ternary metal ion mixtures, alloys and some environmentally relevant matrices.

Keywords:

• Environmental samples
• Rhodium(III)
• 4-Heptylaminopyridine
• solvent extraction