This standard is applicable to the determination of aluminum content in tungsten powder, tungsten bar, tungsten trioxide, tungstic acid and ammonium paratungstate. Measuring range: 0.0005~0.025%.
GB/T 4324.11-1984 history
2012GB/T 4324.11-2012 Methods for chemical analysis of tungsten.Part 11:Determination of aluminum content.Inductively coupled plasma atomic emission spectrometry
1984GB/T 4324.11-1984 Methods for chemical analysis of tungsten--The chromazurol S photometric method for the determination of aluminum content