This standard applies to the determination of the amount of antimony in ferrotungsten. Measuring range: less than 0.06%.
GB/T 7731.8-1987 history
2008GB/T 7731.8-2008 Ferrotungsten.Determination of antimony content.The tetraethlrhodamine photometrie method and inductively couple plasma-atomic mission spectrometry
1987GB/T 7731.8-1987 Methods for chemical analysis of ferrotungsten--The tetraethylrhodamine photometric method for the determination of antiory content