2022 Volume 62 Issue 5 Pages 849-853
This article describes a procedure using flame atomic absorption spectrometry for specimen preparation to quantify tungsten in alloyed tool steel and high-speed steel. The sample solution was prepared using a microwave-assisted digestion with a mixed acid of hydrofluoric, nitric, and phosphoric acids. Vanadium was added as an internal standard element to the sample solution to measure tungsten and vanadium absorption lines simultaneously using a spectrometer equipped with a multi-wavelength system, which comprised a xenon lamp as a continuum light source and an echelle grating. The internal standard method, with its tungsten-to-vanadium absorbance ratio, contributed to accurate and precise quantification of high-content tungsten in tool steel samples.
