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GB/T 21525-2008: Inorganic chemical products for industrial use -- General method for determination of magnesium content by complexation titration
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| GB/T 21525-2008 | English | 139 |
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Inorganic chemical products for industrial use -- General method for determination of magnesium content by complexation titration
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GB/T 21525-2008
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Basic data | Standard ID | GB/T 21525-2008 (GB/T21525-2008) | | Description (Translated English) | Inorganic chemical products for industrial use -- General method for determination of magnesium content by complexation titration | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G10 | | Classification of International Standard | 71.060.01 | | Word Count Estimation | 6,665 | | Date of Issue | 2008-04-01 | | Date of Implementation | 2008-09-01 | | Quoted Standard | GB/T 6682-1992; HG/T 3696.1; HG/T 3696.3 | | Regulation (derived from) | National Standard Approval Announcement 2008 No.5 (Total No.118) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the method for the determination of inorganic chemical products and magnesium content-complexometric titration. This standard applies to edetate disodium (EDTA) as a complexing agent to titration of magnesium content of inorganic chemical products. This standard applies to the content of the test solution of 1 mg of magnesium ions to 200 mg. | GB/T 21525-2008: Inorganic chemical products for industrial use -- General method for determination of magnesium content by complexation titration
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Inorganic chemical products for industrial use. General method for determination of magnesium content by complexation titration
ICS 71.060.01
G10
National Standards of People's Republic of China
Inorganic chemical products of magnesium content determination
General Method complexometric titration
Posted 2008-04-01
2008-09-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
Please note that some of the content of this standard may involve patents. The standard release mechanism should not bear the responsibility to identify these patents.
Appendix A of this standard is the data appendix.
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the National Standardization Technical Committee chemical inorganic chemicals Club (SAC/TC63/SC1) centralized.
This standard is mainly drafted by. CIQ Tianjin, Tianjin Chemical Engineering Research and Design Institute.
The main drafters of this standard. Liu Shao from Sun Shujun, Liu Jun, Lu Siwei.
This standard is the first release.
Inorganic chemical products of magnesium content determination
General Method complexometric titration
1 Scope
1.1 standard specifies the determination of inorganic chemical products in general method magnesium content --- complexometric titration.
1.2 This standard applies to edetate disodium (EDTA) as a complexing agent for titration of inorganic chemical products magnesium content. The standard
Quasi applicable in the test solution of magnesium ion content of 1mg ~ 200mg.
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
Study 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
Preparation of standard titration solution of HG/T 3696.1 inorganic chemical products, chemical 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 three analytical reagent and GB/T 6682-1992 specified
water. Standard Solution, formulations and product tests required in the absence of other requirements specified according to HG/T 3696.1, HG/T 3696.3
Preparation of the provisions.
3.3 Principles
Disodium ethylenediaminetetraacetate (hereinafter referred to as EDTA) having six electron ligand in an aqueous solution with the majority of metal ion
1.1 stable soluble chelates at pH≈10 conditions, adding the appropriate masking agent masking interfering ions, EDTA calcium and magnesium ions
The quantitative determination of selectivity requirements. Acidic chrome blue K, a mixed solution of naphthol green B as indicator, with EDTA standard titration solution
The total amount of calcium and magnesium titration. Under the conditions of the test solution pH≈12.5, magnesium ions and hydroxide precipitates formed by the reaction, only this time with calcium EDTA
Quantitative form chelates to the Cal as indicator, titration with EDTA standard solution titration of calcium. Is subtracted from the total amount of calcium and magnesium in calcium
Content to calculate the magnesium content.
3.4 Reagents
3.4.1 triethanolamine solution. 1 + 1;
3.4.2 triethanolamine solution. 1 + 3;
3.4.3 potassium hydroxide solution.200g/L;
3.4.4 ammonia - ammonium chloride buffer solution A. pH≈10;
3.4.5 disodium ethylenediaminetetraacetate (EDTA) titration solution standard solution. Ba (EDTA) ≈0.02mol/L;
3.4.6 Acid chrome blue K- naphthol green B mixed indicator solution. dissolve 0.3g of acid chrome blue K and naphthol green B 0.75g triethylamine in 100mL
Alcohol amine solution (3.4.1) in.
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