The Colorimetric Determination of Vanadium in Niobium-Vanadium Alloys

摘要

A procedure is described for the analysis of vanadium in niobium*vanadium alloys in the range > 0.2％vanadium with an accuracy of better than 3#. The method was applied to the analysis of niobium alloys in which the nominal per cent vanadium varied between 0.3 - 4.6％.nThe sample is dissolved in a mixture of nitric and hydrofluoric acid and then evaporated to fumes with sulfuric acid. The niobium is hydrolyzed with sulfurous acid and separated from the vanadium by filtration. Hydrogen peroxide is added to the filtrate to form a reddish brown complex with the vanadium. The optical density of the resulting solution is obtained at 450 mu on a model B Beckman spectrophotometer.