Issue 1144, 1971

The spectrophotometric determination of tungsten with thiocyanate. Part III. Moderating the interference by molybdenum in the determination of tungsten in steel

Abstract

Molybdenum in excess of 0·3 per cent. w/w interferes in the determination of tungsten in low tungsten steels (W < 0·25 per cent. w/w) with thiocyanate because of a molybdenum-iron inter-element effect. Two procedures are described which overcome this limitation. In the first procedure tungsten(VI) and molybdenum(VI) are extracted into chloroform as benzoin α-oxime complexes prior to the determination of tungsten. In the second procedure iron is extracted from the tungsten and molybdenum into isobutyl methyl ketone. Up to 4 and 25 per cent. w/w, respectively, of molybdenum in the steel can be tolerated when these procedures are used.

Article information

Article type
Paper

Analyst, 1971,96, 475-479

The spectrophotometric determination of tungsten with thiocyanate. Part III. Moderating the interference by molybdenum in the determination of tungsten in steel

A. G. Fogg, T. J. Jarvis, D. R. Marriott and D. T. Burns, Analyst, 1971, 96, 475 DOI: 10.1039/AN9719600475

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