GB/T 4348.1-2026 Component determination of sodium hydroxide for industrial use—Part 1: Sodium hydroxide and sodium carbonate English, Anglais, Englisch, Inglés, えいご
WARNING—Users of this document shall possess practical experience of formal laboratory operations. This document does not purport to address all of the possible safety problems. Users shall be responsible for taking appropriate safety and health measures and ensuring conformity to the conditions stipulated by relevant national regulations of China.
1 Scope
This document describes the determination principles and test methods for sodium hydroxide and sodium carbonate contents in sodium hydroxide for industrial use, and specifies the reagents or materials, instruments and apparatus, calculation of results, and content of the test report.
This document is applicable to the determination of sodium hydroxide and sodium carbonate contents in sodium hydroxide for industrial use.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 601 Chemical reagent - Preparations of reference titration solutions
GB/T 603 Chemical reagent - Preparations of reagent solutions for use in test methods
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 9725 Chemical reagent - General rule for potentiometric titration
3 Terms and definitions
No terms and definitions are defined in this document.
4 Principle
4.1 Determination principle of sodium hydroxide content
Barium chloride is first added to the specimen solution to convert sodium carbonate into barium carbonate precipitate, and then the solution is titrated with hydrochloric acid standard volumetric solution. The end point is indicated either by using phenolphthalein as indicator solution, or by potentiometric titration based on the electrode potential mutation. The reactions are as follows:
4.2 Determination principle of sodium carbonate content
Contents
Foreword i
Introduction iii
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents or materials
6 Apparatus
7 Test method
8 Calculation of results
9 Test report
GB/T 4348.1-2026 Component determination of sodium hydroxide for industrial use—Part 1: Sodium hydroxide and sodium carbonate English, Anglais, Englisch, Inglés, えいご
WARNING—Users of this document shall possess practical experience of formal laboratory operations. This document does not purport to address all of the possible safety problems. Users shall be responsible for taking appropriate safety and health measures and ensuring conformity to the conditions stipulated by relevant national regulations of China.
1 Scope
This document describes the determination principles and test methods for sodium hydroxide and sodium carbonate contents in sodium hydroxide for industrial use, and specifies the reagents or materials, instruments and apparatus, calculation of results, and content of the test report.
This document is applicable to the determination of sodium hydroxide and sodium carbonate contents in sodium hydroxide for industrial use.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 601 Chemical reagent - Preparations of reference titration solutions
GB/T 603 Chemical reagent - Preparations of reagent solutions for use in test methods
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 9725 Chemical reagent - General rule for potentiometric titration
3 Terms and definitions
No terms and definitions are defined in this document.
4 Principle
4.1 Determination principle of sodium hydroxide content
Barium chloride is first added to the specimen solution to convert sodium carbonate into barium carbonate precipitate, and then the solution is titrated with hydrochloric acid standard volumetric solution. The end point is indicated either by using phenolphthalein as indicator solution, or by potentiometric titration based on the electrode potential mutation. The reactions are as follows:
4.2 Determination principle of sodium carbonate content
Contents of GB/T 4348.1-2026
Contents
Foreword i
Introduction iii
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents or materials
6 Apparatus
7 Test method
8 Calculation of results
9 Test report
