GB/T 21994.2-2008 English PDF

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GB/T 21994.2-2008: Chemical analysis of magnesium fluoride -- Part 2: Determination of moisture content -- Gravimetric method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21994.2-2008	149	Add to Cart	2 days	Chemical analysis of magnesium fluoride -- Part 2: Determination of moisture content -- Gravimetric method	Valid

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Basic data

Standard ID: GB/T 21994.2-2008 (GB/T21994.2-2008)
Description (Translated English): Chemical analysis of magnesium fluoride -- Part 2: Determination of moisture content -- Gravimetric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H12
Classification of International Standard: 77.040.30
Word Count Estimation: 5,515
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 magnesium fluoride in water storage in the wet. This section applies to fluoride determination of moisture content of magnesium. Measurement range: �� 1. 5%.

GB/T 21994.2-2008: Chemical analysis of magnesium fluoride -- Part 2: Determination of moisture content -- Gravimetric method

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Chemical analysis of magnesium fluoride Part 2. Determination of moisture content Gravimetric method. ICS 77.040.30 H12 National Standards of People's Republic of China Chemical analysis of magnesium fluoride Part 2. Determination of the weight of water in the wet 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 2. 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 2. Determination of the weight of water in the wet method

1 Scope

This section specifies the determination method hygroscopic magnesium fluoride in water. This section applies to the determination of magnesium fluoride in hygroscopic water. Measuring range. ≤1.5%.

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

The sample was dried at 110 ℃ and measuring the amount of loss.

4 Instrument

4.1 weighing bottle. diameter 45mm, flat type. 4.2 electric oven. capable of controlling the temperature of 110 ℃ ± 5 ℃.

5 Sample

The specimen shall comply with GB/T 21994.1-2008 in 3.2 requirements. Step 6 Analysis 6.1 Sample Weigh 2.5g of the original sample (5), accurate to 0.001g. 6.2 Determination of the number of Independent of the two measurements, the mean value. 6.3 Determination 6.3.1 The sample (6.1) placed in a pre-bake 2h at 110 ℃ ± 5 ℃ in an electric oven (4.2) inside and cool in a desiccator weighing bottle (4.1), the lid was weighed (accurate to 0.001g). 6.3.2 Place the sample weighing bottle (6.3.1) where the temperature was adjusted to 110 ℃ ± 5 ℃ in an electric oven, the lid of the bottle rack on top do not cover strict. At the same time placed in an oven with a diameter slightly larger than the weighing bottle table dish, bake 2h, remove the cap put on the table dish, and place all dry Dry vessel. After cooling, remove the sheet pan, cap tightly, and weighed (accurate to 0.001g). 7. Calculation of analytical results According to formula (1) to calculate the mass fraction of water in the wet (%). ......

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