- Standard No.
- GB/T 7731.15-1999
- Language
- Chinese
- Release Date
- 1999
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Replace By
-
GB/T 7731.3-2008
- Lastest
-
GB/T 7731.3-2008
- Scope
- This standard specifies the determination of copper content by flame atomic absorption spectrometry. This standard applies to the determination of the amount of copper in ferro-tungsten. Measuring range: 0.02%~0.2%.
GB/T 7731.15-1999 history
- 2008 GB/T 7731.3-2008 Ferrotungsten. Determination of copper content. Bis(cyclohexanone) oxalyldihydrazone photometric method and flame atomic absorption spectrometric method
- 1999 GB/T 7731.15-1999 Methods for chemical analysis of ferrotungsten-The flame atomic absorption spectrometric method for the determination of copper content
GB/T 7731.15-1999 Methods for chemical analysis of ferrotungsten-The flame atomic absorption spectrometric method for the determination of copper content was changed to GB/T 7731.3-2008 Ferrotungsten. Determination of copper content. Bis(cyclohexanone) oxalyldihydrazone photometric method and flame atomic absorption spectrometric method.