The determination of tungsten in high alloy steels by isotope dilution

✍ Scribed by G. Leliaert; J. Hoste; Z. Eeckhaut

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 361 KB
• Volume: 79
• Category: Article
• ISSN: 0165-0513
• DOI: 10.1002/recl.19600790603

✦ Synopsis

Abstract

An isotope dilution procedure using ^185^W has been developed for the determination of tungsten in high alloy steels. Tungsten is determined spectrophotometrically with hydroquinone in sulphuric acid medium, after homogeneous precipitation from a nitric acid‐hydrogen peroxide solution.

For molybdenum‐vanadium‐tungsten alloy steels no further chemical separations are required. The radiometric correction is applied to the residual tungsten so as to minimize counting errors. Analyses carried out on N.B.S. samples showed good accuracy and precision.

For high alloy steels containing niobium, tantalum and titanium a chemical separation of tungsten is necessary to avoid interference in the subsequent spectrophotometric determination. Although the recovery of tungsten is quite low, the magnesia method is entirely satisfactory.

The method was succesfully tested on a number N.B.S. high alloy steels to which varying amounts of tantalum and titanum were added.