GB/T 4324.21-2012 Methods for chemical analysis of tungsten.Part 21:Determination of chromium content.Inductively coupled plasma atomic emission spectrometry (English Version)
This part of GB/T 4324 specifies the determination method of chromium in tungsten powder, tungsten bar, tungsten trioxide, tungstic acid, ammonium metatungstate, ammonium paratungstate, blue tungsten, violet tungsten and tungsten carbide. This part applies to the determination of chromium in tungsten powder, tungsten bar, tungsten trioxide, tungstic acid, ammonium metatungstate, ammonium paratungstate, blue tungsten, violet tungsten and tungsten carbide. The measuring range is 0.000 2%~0.02%.
GB/T 4324.21-2012 history
2012GB/T 4324.21-2012 Methods for chemical analysis of tungsten.Part 21:Determination of chromium content.Inductively coupled plasma atomic emission spectrometry
1984GB/T 4324.21-1984 Methods for chemical analysis of tungsten--The diphenylcarbazide photometric method for the determination of chromium content