Spectrophotometric determination of rhenium in alkaline solution

Abstract

The reaction of perrhenate with hydroxylammonium chloride (NH₃OHCl) has been studied. Hydroxylammonium chloride reacts with rhenium in 8–10 M sodium hydroxide solution to produce a yellow complex which has λ_max. at 300 nm with a molar absorptivity of 7.9 × 10³ l mol^–1 cm^–1. The stoicheiometry of the complex has been studied spectrophotometrically using different procedures. A method for the spectrophotometric determination of rhenium has been developed, and this has been applied to the determination of rhenium in molybdenum-rhenium and tungsten-rhenium alloys.