Sodium alizarin-3-sulphonate as a chromophoric reagent. V. Colorimetric Determination of Vanadium (V)

✍ Scribed by Surendra Nath Sinha; Arun K. Dey

• Publisher: John Wiley and Sons
• Year: 1963
• Tongue: English
• Weight: 269 KB
• Volume: 20
• Category: Article
• ISSN: 1615-4150
• DOI: 10.1002/prac.19630200502

✦ Synopsis

Abstract

The formation of a red coloured chelate (λ~max~ 455 mμ) between ammonium vanadate and sodium alizarin‐3‐sulphonate has been taken advantage of, in the colorimetric determination of pentavalent vanadium on a micro‐scale. The colour formation is instantaneous and the colour intensity is constant between 5°C and 70°C and pH 3.5 and 5.8. The system adheres to BEERS Law over a range of 0.10 to 3.67 p. p. m. of vanadium. The sensitivity is 0.051 γ/cm^2^ (Sandell) and 0.51 γcm^2^ (Practical) Copper, beryllium, bismuth, iron, aluminum, cerium, uranium, thorium, tungsten, molybdenum, carbonate, borate, citrate, and tartrate interfere in the determination.