GB/T 7698-2014 (English Version) PDF

Standard No.: GB/T 7698-2014
Language: Chinese, Available in English version
Release Date: 2014
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 7698-2014
Replace: GB/T 7698-2003

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 the pre-test, the samples are divided into three categories: a) Samples without sulfide and chlorate. b) Samples containing sulfides. This standard applies to products with a mass fraction of sulfide (calculated as Na₂S) less than 0.1%. c) Samples containing chlorate. This standard applies to products with a mass fraction of chlorate (calculated as NaClO₃) less than 0.2%. Due to the presence of interfering components in samples of types b) and c), make appropriate modifications to the analysis steps (see Chapter 10).

GB/T 7698-2014 Referenced Document

GB/T 29643 Sodium hydroxide for industrial use.Laboratory sample.Preparation of the main solution for carrying out certain determinations
GB/T 601 Chemical reagent.Preparations of reference titration solutions*， 2016-10-13 Update
GB/T 603 Preparation of preparations and products used in chemical reagent test methods*， 2023-08-06 Update
GB/T 6682 Water for analytical laboratory use.Specification and test methods

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