- Standard No.
- GB/T 19421.8-2003
- Language
- Chinese
- Release Date
- 2003
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Replace By
-
GB/T 19421-2008
- Lastest
-
GB/T 19421-2008
- Scope
- This part of GB/T 19421 specifies the method for the determination of ferric oxide by the o-phenanthroline colorimetric method in layered crystalline sodium disilicate. This section applies to the determination of ferric oxide content (0.01% to 0.1%) in layered crystalline sodium disilicate that can be used as a detergent builder.
GB/T 19421.8-2003 history
- 2008 GB/T 19421-2008 Test methods of crystalline layered sodium disilicate
- 2003 GB/T 19421.8-2003 Test methods of crystalline layered sodium disilicate--Phenanthroline photometric methods for determination of iron oxide content
GB/T 19421.8-2003 Test methods of crystalline layered sodium disilicate--Phenanthroline photometric methods for determination of iron oxide content was changed to GB/T 19421-2008 Test methods of crystalline layered sodium disilicate.