Spectrophotometric determination of rhenium with thiourea

Abstract

A spectrophotometric method for the determination of rhenium with thiourea and stannous chloride is studied, and it is used for determination of rhenium in platinumrhenium alloys and in several rhenium compounds. Analytical procedure is as follows. A sample solution containing 0.05 to 2 mg of rhenium is introduced into a 100 ml volumetric flask, followed by addition of 25 ml of concentrated hydrochloric acid, 12 ml of 5% thiourea solution and 6 ml of 1 M stannous chloride in 4 M hydrochloric acid solution. It is made up to the mark with water and mixed thoroughly. After 50 minutes or later, the absorbance is measured at 390 mμ or 445 mμ and rhenium is determined referring to the analytical curve which was linear in the range of 0 to 2 mg of rhenium. The method is applicable to the accurate determination of rhenium.