GB/T 7698-2003
Sodium hydroxide for industrial use--Determination of carbonates content--Titrimetric method (English Version)
- Standard No.
- GB/T 7698-2003
- Language
- Chinese, Available in English version
- Release Date
- 2003
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Status
- 2015-05
- Replace By
- GB/T 7698-2014
- Latest
- GB/T 7698-2014
- Replace
- GB/T 7698-1987
- Scope
- This standard specifies the method for the determination of carbonate content in sodium hydroxide for industrial use. This standard is applicable to products whose mass fraction of carbonate (calculated as Na2CO3) is greater than or equal to 0.02%. Through preliminary experiments, the samples can be divided into three categories: 1.1 Sodium hydroxide without sulfide and chlorate. 1.2 Sodium hydroxide containing sulfides. This standard applies to products with a mass fraction of sulfide (calculated as Na2S) less than 0.1%. 1.3 Sodium hydroxide containing chlorate. This standard applies to products with a mass fraction of chlorate (calculated as Na2ClO3) less than 0.2%. For 1.2 and 1.3, the analytical procedure needs to be modified appropriately due to the presence of special components (see details given in Chapter 10).
GB/T 7698-2003 history
- 2014 GB/T 7698-2014 Sodium hydroxide for industrial use.Determination of carbonates content.Titrimetric method
- 2003 GB/T 7698-2003 Sodium hydroxide for industrial use--Determination of carbonates content--Titrimetric method
- 0000 GB/T 7698-1987
