GB/T 21057-2007Inorganic chemical for industrial use - General method for determination of fluorine content-Ion selective electrode method (English PDF)
无机化工产品中氟含量测定的通用方法 离子选择性电极法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
August 13, 2007
Implementation date
February 1, 2008
Scope
GB/T 21057-2007 is the English-translated version of 无机化工产品中氟含量测定的通用方法 离子选择性电极法.
GB/T 21057-2007 is the Chinese standard "Inorganic chemical for industrial use - General method for determination of fluorine content-Ion selective electrode method".
Its scope clause reads: This standard specifies the general method of inorganic chemical products determination of fluorine content --- ion selective electrode method.
This standard applies to the determination of inorganic chemical products fluorine content.
The standard specifies the method for determination of fluorine content in the preparation of the test solution When should refer to the relevant product standard analysis of the standard make the necessary changes to make it suitable for the determination of the product.
This standard applies to the taking Test solution fluoride ion concentration of 0.04µg/mL ~ 40µg/mL. Its clauses include test method.
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Document preview — GB/T 21057-2007
National Standard of the People's Republic of China
- ICS
- 71.060.01
- Classification
- G 10
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Normative references
- 3 Test Method
- 3.1 Safety Tips
- 3.2 General Provisions
- 3.3 Principles
- 3.4 Reagents
1 Scope
This standard specifies the general method of inorganic chemical products determination of fluorine content --- ion selective electrode method.
This standard applies to the determination of inorganic chemical products fluorine content. The standard specifies the method for determination of fluorine content in the preparation of the test solution
When should refer to the relevant product standard analysis of the standard make the necessary changes to make it suitable for the determination of the product. This standard applies to the taking
Test solution fluoride ion concentration of 0.04µg/mL ~ 40µg/mL.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
Laboratory use specifications and test methods (. 1987 neq ISO 3696) GB/T 6682-1992 Analysis
Preparations of HG/T 3696.3 inorganic chemical products, chemical analysis
3 Test Method
3.1 Safety Tips
Reagents used in this test method are toxic or corrosive, the operator must be careful! Such as water splashed on the skin should immediately
Flushing, severe cases should be treated immediately.
3.2 General Provisions
This standard reagents and water, did not indicate when the other requirements, refer to analytically pure reagents and GB/T 6682-1992 specified three
Grade water.
Tests required preparations and products, the provisions of HG/T 3696.3 it did not indicate when prepared according to other requirements.
3.3 Principles
Fluorine ion selective electrode as the indicator electrode, a saturated calomel electrode as the reference electrode electrochemical cell with an ion gauge measuring the electromotive force, workers
Curve for quantification. The acidity of the solution was measured to pH = 6, the total ionic strength modifier eliminate Fe, Al plasma interference and acidity Movies
Sound, and interference cancellation method in Appendix A.
3.4 Reagents
3.4.1 sodium hydroxide solution
40g/L.
3.4.2 sodium hydroxide solution
250g/L.
3.4.3 nitrate solution
1 + 5.
3.4.4 nitric acid solution
1 + 15.
3.4.5 The total ionic strength modifiers (TISAB)
preparation see Appendix B.
3.4.6 bromine naphthol green indicator solution
1g/L.
3.4.7 fluoro standard solution I
1mL solution of fluorine (F) 1000µg.
Weigh 2.211g at 120 °C drying 2h sodium fluoride to water to dissolve and transferred to 1000mL volumetric flask, dilute to the mark with water, shake
Uniform, into plastic bottles to save.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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