GB/T 37321-2019Chemical analysis methods of different sulfur forms in gypsum and gypsum products (English PDF)
石膏及石膏制品中形态硫化学分析方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
March 25, 2019
Implementation date
February 1, 2020
Scope
GB/T 37321-2019 is the English-translated version of 石膏及石膏制品中形态硫化学分析方法.
GB/T 37321-2019 specifies chemical analysis methods for the different forms of sulfur, namely sulfite, sulfide, elemental sulfur and sulfate, in gypsum and gypsum products.
Clause 1 states that it applies to the determination of those forms in natural gypsum, flue gas desulfurization gypsum, phosphogypsum, fluorogypsum and other gypsum raw materials and in gypsum products, and sets no exclusions.
Clause 3 defines formal sulfur as the sulfur present in the form of sulfites, sulfides, elemental sulfur and sulfates in gypsum and gypsum products.
The analytical clauses are arranged one method at a time: the continuous determination of sulfites and sulfides by ion chromatography, the separation of sulfides by ion chromatography, the determination of elemental sulfur by ion chromatography and again by liquid chromatography, and the determination of sulfate, followed by a clause on the test report and a normative Appendix A on the acceptance procedures for analysis results.
Clause 4 sets the basic requirements common to all of them, that the reagents be not lower than analytical grade and the water meet the secondary water requirements of GB/T 6682, that the density of the concentrated liquid reagents listed be taken at 20 C in grams per cubic centimetre, that each measurement be made twice and reported as the average of the two results with their validity judged by the procedure in Appendix A, and that a blank test be run with the same amount of reagent and no sample; clause 5 covers the preparation of the sample.
The introduction carries a patent declaration: complying with the document may involve two patents, ZL201210384906.9 and ZL201310009136.4, whose holder has assured the issuing organization that it is willing to negotiate licences on reasonable and non-discriminatory terms, while the issuing organization takes no position on their authenticity, validity or scope and does not undertake to identify any further patents that may be involved.
Clause 2 cites GB/T 5484, GB/T 6682 and GB/T 8170. The draft on this page breaks off inside clause 4, so none of the analytical procedures themselves is shown. It was issued on 2019-03-25 and has applied since 2020-02-01.
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Document preview — GB/T 37321-2019
National Standard of the People's Republic of China
- ICS
- 91.100.10
- Classification
- Q 27
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 basic requirements of the test
- 5 Preparation of sample
- 6 Continuous determination of sulfites and sulfides (ion chromatography)
- 7 Separation of sulfides (ion chromatography)
- 8 Determination of elemental sulfur (ion chromatography)
- 9 Determination of elemental sulfur (liquid chromatography)
- 10 Determination of sulfate
- 11 Test report
- Appendix A (Normative Appendix) Analysis Results Acceptance Procedures
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
Introduction
The issuing organization of this document draws attention to the fact that when the statement is in compliance with this document, it may involve the determination of the elemental sulfur content of the building material.
Method (Patent No. ZL201210384906.9) and Patent "Continuous Determination of Sulfite and Sulfide Content in Building Materials and Geological Materials" Method (Patent No. ZL201310009136.4) use of related content.
The issuing organization of this document has no position on the authenticity, validity and scope of the patent.
The holder of the patent has assured the issuing authority of this document that he is willing to work with any applicant on reasonable and non-discriminatory terms and conditions.
Negotiate on patent licensing. The patent holder's statement has been filed with the issuing authority of this document.
Please note that in addition to the above patents, certain aspects of this document may still involve patents. The issuing organization of this document does not undertake to identify these special Liability.
1 Scope
This standard specifies the chemical analysis of different forms of sulfur such as sulfite, sulfide, elemental sulfur and sulfate in gypsum and gypsum products. method.
This standard applies to natural gypsum, flue gas desulfurization gypsum, phosphogypsum, fluorogypsum and other gypsum raw materials and gypsum products in the sulfite, vulcanization Determination of substances, elemental sulfur and sulfate.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 5484 gypsum chemical analysis method
GB/T 6682 Analytical laboratory water specifications and test methods
GB/T 8170 Numerical Rounding Rules and Representation and Determination of Limit Values
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Formal sulfur
Sulfur in the form of sulfites, sulfides, elemental sulfur and sulfates in gypsum and gypsum products.
4 Basic requirements of the test
4.1 Reagents
Unless otherwise stated, the reagents used in the test shall not be lower than the analytical grade, and the water used shall meet the secondary water requirements specified in GB/T 6682.
The density of commercially available concentrated liquid reagents listed in this standard refers to a density (rho) at 20 ° C in grams per cubic centimeter (g/cm 3 ).
The acid used is not a concentration of any of the commercially available concentrated acids.
4.2 Number of tests and requirements
The number of tests for each measurement is specified as two times, and the average of the results of the two tests is used to indicate the measurement results. Validity of results Follow the procedure in Appendix A.
4.3 Blank test
Unless otherwise specified, the same amount of reagent is used, no sample is added, and the test is performed according to the same measurement procedure. Make corrections.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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Related Standards
GB/T 5484-2024 — Methods for chemical analysis of gypsum
GB/T 6682-2008 — Water for analytical laboratory use - Specification and test methods
GB/T 8170-2008 — Rules of rounding off for numerical values & expression and judgement of limiting values
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GB/T 37321-2019
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