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GB/T 21994.4-2008: Chemical analysis of magnesium fluoride -- Part 4: Determination of magnesium -- EDTA volumetric method
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Chemical analysis of magnesium fluoride -- Part 4: Determination of magnesium -- EDTA volumetric method
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GB/T 21994.4-2008
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Basic data | Standard ID | GB/T 21994.4-2008 (GB/T21994.4-2008) | | Description (Translated English) | Chemical analysis of magnesium fluoride -- Part 4: Determination of magnesium -- EDTA volumetric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H12 | | Classification of International Standard | 77.040.30 | | Word Count Estimation | 6,617 | | Date of Issue | 2008-06-09 | | Date of Implementation | 2008-12-01 | | Quoted Standard | GB/T 21994.1-2008 | | Regulation (derived from) | National Standard Approval Announcement 2008 No.9 (Total No.122) | | 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 determination of the amount of magnesium in magnesium fluoride. This section applies to the determination of magnesium fluoride, magnesium content. Measuring range: 25% to 40%. | GB/T 21994.4-2008: Chemical analysis of magnesium fluoride -- Part 4: Determination of magnesium -- EDTA volumetric method
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Chemical analysis of magnesium fluoride Part 4. Determination of magnesium EDTA volumetric method
ICS 77.040.30
H12
National Standards of People's Republic of China
Chemical analysis of magnesium fluoride
Determination of magnesium content. Part 4
EDTA volumetric method
Posted 2008-06-09
2008-12-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 21994 "Chemical analysis of magnesium fluoride" is divided into eight sections.
--- Part 1. Preparation and storage of test samples;
--- Part 2. Determination of the weight of water in the wet method;
--- Part 3. Determination of distillation of fluorine content - thorium nitrate volumetric method;
--- Part 4. Determination of magnesium content - EDTA volumetric method;
--- Part 5. Determination of calcium content by flame atomic absorption spectrometry;
--- Part 6. Determination of silicon dioxide content - Molybdenum blue spectrophotometric method;
--- Part 7. Determination of iron oxide content phenanthroline spectrophotometry;
--- Part 8. Determination of sulfate content of barium sulfate gravimetric method.
This is Part 4.
This part is proposed by the China Nonferrous Metals Industry Association.
The non-ferrous metal part by the National Standardization Technical Committee.
This section is Hunan Nonferrous fluorine chemical limited liability company, China Nonferrous Metals Industry Institute of Standards Metrology and Quality is responsible for drafting.
This section is drafted. Hunan Nonferrous fluorine chemical limited liability company.
Participated in the drafting of this section. Fluoride Chemicals Co., Ltd., Silver fluoride limited liability company.
The main drafters of this section. Li Zhijian, Liao Zhihui, Chen Xiang Yu, Zhu Liang, Xu Jin Xue, Wang Jianping, Guo Xianhui, Bo, Li Ye.
Chemical analysis of magnesium fluoride
Determination of magnesium content. Part 4
EDTA volumetric method
1 Scope
This section provides the determination of the amount of magnesium in the magnesium fluoride.
This section applies to the determination of magnesium fluoride, magnesium content. Measuring range. 25% to 40%.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this part. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this section, however, encourage the parties to this part of the research agreement
Whether the latest versions of these documents. For undated references, the latest edition to adapt to this section.
GB/T 21994.1-2008 Chemical analysis of magnesium fluoride - Part 1. Sample Preparation and Storage
3 Method summary
Sample with hydrofluoric acid, sulfuric acid decomposition, acidic chrome blue K- naphthol green B as indicator, titrated with EDTA solution.
4 Reagents
4.1 Hydrofluoric acid (40%).
4.2 sulfate (1 + 1).
4.3 hydrochloride (3mol/L).
4.4 methyl orange indicator (1g/L).
Ammonia 4.5 (1 + 1).
4.6 ammonium chloride washing solution. Weigh 1g of ammonium chloride dissolved in 500mL of water, add 2 drops of methyl orange indicator, with ammonia (1 + 1) and
Adjusted hydrochloric acid (3mol/L) just yellow, and 2 drops of excess.
4.7 nitric acid (1 + 1).
Triethanolamine 4.8 (1 + 2).
4.9 ammonia buffer solution (pH = 10). Weigh 67.5g of ammonium chloride was dissolved in 200mL of water, 510mL of concentrated aqueous ammonia was added, diluted to
1000mL, mix, sealed.
4.10 calcium indicator. Weigh 1g and 10g anhydrous sodium sulfate and calcium indicator put an agate mortar and grind evenly, put the dryer saved.
4.11 Magnesium indicator. Weigh acid chrome blue K0.1144g, naphthol green B0.2856g, was dissolved in 100mL of water, stored in a brown bottle
spare.
4.12 xylenol orange indicator (1g/L). Weigh 0.1000g xylenol orange indicator directly dissolved in 100mL of water, stored in a
150mL brown dropper bottle aside.
4.13 HCl (1 + 1).
4.14 of potassium hydroxide.
4.15 potassium hydroxide solution (200g/L).
4.16 acetic acid - sodium acetate buffer solution pH = (5.5 ~ 6). Weigh 120.5g anhydrous sodium acetate is dissolved in water, was added 10mL of glacial acetic
Dilute acid, add water to 1000mL, mixing spare.
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