This standard applies to the determination of antimony in tungsten powder, tungsten bar, tungsten trioxide, tungstic acid and ammonium paratungstate. Measuring range: 0.00005~0.005%.
GB/T 4324.4-1984 history
2012GB/T 4324.4-2012 Methods for chemical analysis of tungsten.Part 4:Determination of antimony content.Hydrogenate atomic absorption spectrometry
1984GB/T 4324.4-1984 Methods for chemical analysis of tungsten--The malachite green photometric method for the determination of antimony content