✦ LIBER ✦

Catalytic method for the determination of traces of tungsten by linear scan voltammetry

✍ Scribed by Jiang Zhi-Liang; Liao Lin-Xiu; Liu Min-Deng

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 327 KB
Volume: 300
Category: Article
ISSN: 0003-2670
DOI: 10.1016/0003-2670(94)00401-7

No coin nor oath required. For personal study only.

✦ Synopsis

A novel, sensitive and selective catalytic method for the determination of tungsten is described, based on the W(VI)-catalysed redox reaction between methyl red and Ti(III) in a hydrochloric acid medium; methyl red exhibits a sensitive oscillopolarographic wave at -0.68 V vs. SCE in NaOH solution. A calibration graph from 3.2 to 72 ng ml-' W (detection limit 1.1 ng ml-') is obtained by the fixed-reaction time procedure. The influence of 29 foreign ions on the catalytic determination of W was examined; none interfered at < lOO-fold excess. The method is used to determine W in steel and ore samples, with satisfactory results.

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