Amperometric Determination of Vanadium (V) as copper orthovanadate

Abstract

A rapid amperometric method for the determination of vanadium (V) has been described which involves titration of vanadium (V) as sodium orthovanadate against copper sulphate solution at Ede = − 0.20 V (vs S.C.E.). The accuracy and reproducability of the method is excellent particularly at higher temperature i.e. at 60°C. The method permits the determination of vanadium (V) down to 0.2 mM with an accuracy 1.0%).

Nonferrous metallurgy. II. Zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, and tungsten

“…Several methods have been proposed for the titrimetric determination of vanadium in which the end point is detected amperometrically. The precipitation of a cadmium polyvanadate has been used as the basis for an amperometric titra-tion (559) as has the precipitation of a lead polyvanadate (560) and copper ortho vanadate (237). Amperometric end point detection has also been used successfully for the titration of vanadium (IV) using permanganate as the titrant (592) and the titration of vanadium(V) using iron(II) as the titrant (511,602,603).…”

Amperometric titrations

“…The instability constants of the reaction products of copper(II) salts with Cr2-(S04)3 have been determined by amperometric titration (156). Titration with CuS04 has been used to determine vanadium (V) (90). Because stepwise addition of Na2S203 to gold (III) gives various reduction products, Na2S203 was not recommended as an amperometric titrant for gold (240).…”