This part of GB/T 4324 specifies the determination method of phosphorus content in tungsten powder, tungsten bar, tungsten trioxide, blue tungsten, purple tungsten, tungsten carbide, tungstic acid, ammonium paratungstate, ammonium metatungstate. This part applies to tungsten powder , tungsten bar, tungsten trioxide, blue tungsten, purple tungsten, tungsten carbide, tungstic acid, ammonium paratungstate, ammonium metatungstate Determination of phosphorus content, the determination range is 0.000 2%~0.018%,
GB/T 4324.24-2012 history
2012GB/T 4324.24-2012 Methods for chemical analysis of tungsten.Part 24:Determination of phosphorus content.Molybdemum blue photometry
1984GB/T 4324.24-1984 Methods of chemical analysis of tungsten--The beryllium as carrier precipitation agent-molybdenum blue photometric method for the determination of phosphorus content