- Standard No.
- GB/T 7731.13-1988
- Language
- Chinese
- Release Date
- 1988
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Replace By
-
GB/T 7731.12-2008
- Lastest
-
GB/T 7731.12-2008
- Scope
- This standard applies to the determination of sulfur content in ferrotungsten. Measuring range: ≤0.250%.
GB/T 7731.13-1988 history
- 2008 GB/T 7731.12-2008 Ferrotungsten. Determination of sulfur content. Infrared absorption method and combustion titration method
- 1988 GB/T 7731.13-1988 Methods for chemical analysis of ferrotungsten--The combustion-neutralization titration method for the determination of sulfur content
GB/T 7731.13-1988 Methods for chemical analysis of ferrotungsten--The combustion-neutralization titration method for the determination of sulfur content was changed to GB/T 7731.12-2008 Ferrotungsten. Determination of sulfur content. Infrared absorption method and combustion titration method.