Determination of rhenium based on the formation of rhenium(VI) oxide halide complexes by spectrophotometry and electron spin resonance spectroscopy

ANALYSTANALYST Pub Date: DOI: 10.1039/AN9820700500

Abstract

The possibility of obtaining solutions of rhenium(VI) compounds and their analytical applications has been studied. The rhenium(VI) compounds formed, ReOCl5– and ReOBr4, are characterised by specific absorbance spectra and electron spin resonance (ESR) spectra. New quantitative methods of rhenium determination were devised. The formation of ReOBr4 in sulphuric acid from the ReO4– ion and KBr was used for the development of a selective spectrophotometric method for the determination of rhenium and the ability of ReOBr4 to be extracted into organic solvents was used for rhenium determination by ESR.

On the basis of ReOCl5– formation, a quantitative method for the determination of rhenium by the spectrophotometric titration of ReO4– in a mixture of sulphuric and hydrochloric acids using an iron(II) solution was devised. The methods were also applied to alloys.

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