This standard is applicable to the determination of cobalt content in tungsten powder, tungsten bar, tungsten trioxide, tungstic acid and ammonium paratungstate. Measuring range: 0.0007~0.012%.
GB/T 4324.7-1984 history
2012GB/T 4324.7-2012 Methods for chemical analysis of tungsten.Part 7:Determination of cobalt content.Inductively coupled plasma atomic emission spectrometry
1984GB/T 4324.7-1984 Methods for chemical analysis of tungsten--The 5-cl-PADAB photometric method for the determination of cobalt content