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The determination of tungsten in high alloy steels by isotope dilution

1960; Royal Netherlands Chemical Society; Volume: 79; Issue: 6 Linguagem: Inglês

10.1002/recl.19600790603

1878-7096

G. Leliaert, J. Hostè, Z. Eeckhaut,

Hydrogen embrittlement and corrosion behaviors in metals

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.