DETERMINATION OF VANADIUM IN STEELS AND FERROUS ALLOYS BY AMPEROMETRIC TITRATION USING TWO INDICATOR ELECTRODES

Journal Article · Fri Jan 01 04:00:00 EST 1960 · Zavodskaya Lab.

OSTI ID:4101342

Studenskaya, L S; Songina, O A

In the most extensively employed method of determining vanadium in ferrous alloys by amperometric titration with Mohr's salt, a permanganate solution must be added in excess to oxidize completely the vanadium; elimination of this excess complicates the process. Use of two electrodes with applied emf improved this condition; the permanganate and the trivalent iron were reduced in 2N H/sub 2/SO/sub 4/ solution, whereas the vanadium was not. A voltage of 0.5 to 1.0 volts was applied on the platinum electrodes. As titrating solution was added, the current was reduced and then stayed at a constant value while the vanadate was reduced by Mohr's salt. During this period the emf of the OH/sup -// Fe/sup 3+/ couple formed was not sufficient to compensate the applied voltage. Beyond the end point, an Fe/sup 3+//Fe/sup 2+/ couple was formed, causing a rise in the emf. The titration could be repeated after reoxidizing the vanadium by permanganate. The end point derived from the amperometric curve was very sharp. (TT T)

• Research Organization: Ural Scientific Research Inst. of Ferrous Metals, USSR; Kazakh State Univ., USSR
• NSA Number: NSA-15-005970
• OSTI ID: 4101342
• Journal Information: Zavodskaya Lab., Journal Name: Zavodskaya Lab. Vol. Vol: 26
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

ALLOYS
CHEMISTRY
ELECTRODES
IRON
MANGANESE COMPOUNDS
MOHR SALT
OXIDATION
PLATINUM
QUANTITATIVE ANALYSIS
REDUCTION
SOLUTIONS
STEELS
SULFURIC ACID
TITRATION
VANADIUM