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GB/T 21994.8-2008 English PDF

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GB/T 21994.8-2008: Chemical analysis of magnesium fluoride -- Part 8: Determination of sulphate content -- Barium sulphate gravimetric method
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GB/T 21994.8-2008English139 Add to Cart 3 days [Need to translate] Chemical analysis of magnesium fluoride -- Part 8: Determination of sulphate content -- Barium sulphate gravimetric method Valid GB/T 21994.8-2008

PDF similar to GB/T 21994.8-2008


Standard similar to GB/T 21994.8-2008

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Basic data

Standard ID GB/T 21994.8-2008 (GB/T21994.8-2008)
Description (Translated English) Chemical analysis of magnesium fluoride -- Part 8: Determination of sulphate content -- Barium sulphate gravimetric method
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard H12
Classification of International Standard 77.040.30
Word Count Estimation 6,677
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 fluoride, magnesium sulfate content. This section applies to fluoride determination of magnesium sulfate content. Measurement range: �� 1. 50%.

GB/T 21994.8-2008: Chemical analysis of magnesium fluoride -- Part 8: Determination of sulphate content -- Barium sulphate gravimetric method


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Chemical analysis of magnesium fluoride Part 8. Determination of sulphate content Barium sulphate gravimetric method ICS 77.040.30 H12 National Standards of People's Republic of China Chemical analysis of magnesium fluoride Determination of sulfate content. Part 8 Barium sulfate gravimetric 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 section section 8. 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 sulfate content. Part 8 Barium sulfate gravimetric method

1 Scope

This section provides magnesium fluoride determination method of sulfate content. This section applies to the determination of magnesium fluoride, sulfate content. Measuring range. ≤1.50%.

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

A specimen in the melt of sodium carbonate and boric acid flux melt is dissolved in perchloric acid, in acid medium, to precipitate barium sulfate from After the child, the barium sulfate was fired at 850 ℃, weighed.

4 Reagents

4.1 anhydrous sodium carbonate. 4.2 boric acid. 4.3 perchloric acid (ρ1.67g/mL). 4.4 sulfate (ρ1.84g/mL). 4.5 hydrochloric acid (6mol/L). 4.6 barium chloride solution (122g/L). Weigh 122g crystallized barium chloride (BaCl2 · 2H2O), dissolved in water and diluted to 1000mL. Silver nitrate 4.7 - nitric acid solution (5g/L). 0.5g of silver nitrate was dissolved in a small amount of water, 10mL of nitric acid was added (ρ1.42g/mL), diluted with water Diluted to 100mL, and mix.

5 instruments and equipment

5.1 platinum dish. flat, diameter 75mm, height 30mm. 5.2 a platinum crucible. diameter 30mm, high 30mm. 5.3 Oven. to control the temperature at 110 ℃ ± 5 ℃. 5.4 Furnace temperature. the temperature can be controlled at 850 ℃ ± 20 ℃.

6 Sample

The specimen shall comply with GB/T 21994.1-2008 in 3.3 requirements.

7 Procedure

7.1 Sample Weigh 1g dried specimen (6), accurate to 0.001g.

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