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GB/T 21994.3-2008: Chemical analysis of magnesium fluoride -- Part 3: Determination of fluoride content -- Distillation-thorium nitrate titration volumetric method
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| GB/T 21994.3-2008 | English | 169 |
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Chemical analysis of magnesium fluoride -- Part 3: Determination of fluoride content -- Distillation-thorium nitrate titration volumetric method
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GB/T 21994.3-2008
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Basic data | Standard ID | GB/T 21994.3-2008 (GB/T21994.3-2008) | | Description (Translated English) | Chemical analysis of magnesium fluoride -- Part 3: Determination of fluoride content -- Distillation-thorium nitrate titration volumetric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H12 | | Classification of International Standard | 77.040.30 | | Word Count Estimation | 7,742 | | 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 fluoride, magnesium fluoride. This section applies to fluoride, magnesium fluoride determination of the amount. Measuring range: 40% to 62%. | GB/T 21994.3-2008: Chemical analysis of magnesium fluoride -- Part 3: Determination of fluoride content -- Distillation-thorium nitrate titration volumetric method
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Chemical analysis of magnesium fluoride Part 3. Determination of fluoride content Distillation-thorium nitrate titration volumetric method
ICS 77.040.30
H12
National Standards of People's Republic of China
Chemical analysis of magnesium fluoride
Part 3. Determination of fluorine content
Distillation - thorium nitrate 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 3.
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
Part 3. Determination of fluorine content
Distillation - thorium nitrate volumetric method
1 Scope
This section provides the determination of fluorine in the amount of magnesium fluoride.
This section applies to the determination of magnesium fluoride of fluorine content. Measurement range. 40% to 62%.
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 sodium carbonate melt. By sulfuric acid - steam distillation after the separation of fluorine, with sodium alizarin yellow - Methylene blue as indicator, with thorium nitrate solution
Titrated.
4 Reagents
4.1 anhydrous sodium carbonate.
4.2 sulfate (1 + 1).
4.3 Alizarin Red S indicator (2.5g/L).
4.4 Sodium hydroxide solution (20g/L).
4.5 hydrochloric acid solution (99 + 1).
4.6 acetic acid (1mol/L).
4.7 Methylene blue indicator (0.1g/L).
4.8 thorium nitrate standard solution
4.8.1 preparation. Weigh 1.8g thorium nitrate tetrahydrate [Th (NO3) 4 · 4H2O], dissolved in water and diluted to 1L, mixing quiet place, the next day
Calibration.
4.8.2 Calibration. Weigh 0.1300g ignition advance and placed in a desiccator to cool anhydrous sodium fluoride (high purity) at 600 ℃. With 20mL ~
30mL water distillation flask transferred fluoride. Press the following analysis steps 7.4.2 ~ 7.4.3 conduct. Meanwhile blank experiment.
The actual concentration of thorium nitrate standard solution according to the formula (1).
Ba m1 = 0.4525 × 2 × Vp Vp 1-
103 (1)
Where.
Ba --- the actual concentration of thorium nitrate standard solution, in milligrams per milliliter (mg/mL);
M1 --- said to take quality sodium fluoride, in grams (g);
Volume consumed Vp 1 --- Calibration thorium nitrate standard solution, in milliliters (mL);
2 --- consumed Vp thorium nitrate standard blank test solution volume in milliliters (mL of);
0.4525 --- sodium fluoride in terms of coefficients.
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