Extraction and spectrophotometric determination of bismuth(III) with Cyanex 301

Abstract

A spectrophotometric method for the determination of microgram amounts of bismuth(III) is described based on the solvent extraction of bismuth(III) from 0.5–3.0 mol dm^–3 HCl with Cyanex 301 in toluene. The Bi^III complex with Cyanex 301 in toluene gives a yellow colour (λ_max, 439 nm; molar absorptivity, 5.53 × 10³ l mol^–1 cm^–1). Bismuth has been determined in alloys and pharmaceutical samples.