GB/T 4324.10-2012 《Methods for chemical analysis of tungsten - Part 10: Determination of copper content - Flame atomic absorption spectrometry》 Related products

Part 10 of this standard specifies methods for the determination of copper content in tungsten powder, tungsten bar, tungsten carbide, tungsten trioxide, tungstic acid, blue tungsten, purple tungsten, ammonium paratungstate and ammonium metatungstate. The determination range is 0.0003% to 0.0030%. The method involves analysis of the sample with hydrogen peroxide and ammonia water, followed by treatment with muriatic acid to remove the tungsten matrix. The treated clear liquid is measured at 324.7 nm wavelength in AtomicAbsorption Spectroscopy using an air-acetylene flame. This method provides a high-accuracy measurement standard for copper content and is suitable for various tungsten compounds.