GB/T 21994.5-2008 English PDF

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GB/T 21994.5-2008: Chemical analysis of magnesium fluoride -- Part 5: Determination of calcium content -- Method of flame atomic absorption spectrometry
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21994.5-2008	139	Add to Cart	3 days	Chemical analysis of magnesium fluoride -- Part 5: Determination of calcium content -- Method of flame atomic absorption spectrometry	Valid

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Basic data

Standard ID: GB/T 21994.5-2008 (GB/T21994.5-2008)
Description (Translated English): Chemical analysis of magnesium fluoride -- Part 5: Determination of calcium content -- Method of flame atomic absorption spectrometry
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H12
Classification of International Standard: 77.040.30
Word Count Estimation: 6,656
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 method for the determination of calcium magnesium fluoride. This section applies to the determination of magnesium fluoride of calcium. Measurement range: �� 1. 5%.

GB/T 21994.5-2008: Chemical analysis of magnesium fluoride -- Part 5: Determination of calcium content -- Method of flame atomic absorption spectrometry

---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 5. Determiantion of calcium content Method of flame atomic absorption spectrometry ICS 77.040.30 H12 National Standards of People's Republic of China Chemical analysis of magnesium fluoride Part 5. Determination of calcium content Flame Atomic Absorption Spectrometry 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 5. 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. Drafting this Part. Aluminum Corporation of China Zhengzhou Research Institute. Participated in the drafting of this section. Hunan Nonferrous fluorine chemical limited liability company, Silver fluoride limited liability company. The main drafters of this section. Feng Jingdong, Wang Guifang, Shi Lei, Li Zhijian, Zhu Liang, Wang Bo, Li Ye. Chemical analysis of magnesium fluoride Part 5. Determination of calcium content Flame Atomic Absorption Spectrometry

1 Scope

This section specifies the determination method of calcium magnesium fluoride. This section applies to the determination of magnesium fluoride of calcium. 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 reference documents, the latest versions apply to this section. GB/T 21994.1-2008 Chemical analysis of magnesium fluoride - Part 1. Sample Preparation and Storage

3 Method summary

Sample with perchloric acid, hydrochloric acid decomposition, lanthanum chloride solution or strontium chloride solution as release agents, calcium was determined by atomic absorption spectrometry content.

4 Reagents

4.1 perchloric acid (GR, ρ1.67g/cm 3). 4.2 HCl (1 + 1). 4.3 strontium chloride (SrCl2 for) solution (100g/L). 4.4 lanthanum chloride (LaCl3 · 7H2O) solution (100g/L). 4.5 magnesium fluoride (MgF2) substrate solution. Weigh 0.2000g of magnesium fluoride (spectroscopically pure) in a platinum dish, add a little water, 5mL perchlorate (4.1), low-temperature heating to take to make white smoke, again adding a small amount of water and 5mL perchloric acid (4.1), low-temperature heating to take to make white smoke, remove the cooled to room Temperature, was added 5mL hydrochloric acid (4.2), and 30mL of water, heated and dissolved salts, remove cooling to room temperature, the solution is transferred 100mL volumetric flask Water, dilute to the mark, and mix. 4.6 Calcium standard stock solution. Weigh 1.2486g of calcium carbonate (CaCO3, reference reagents at 110 ℃ drying 2h, cooled in the dryer to Room temperature) in 500mL beaker, was added 50mL of water, 10 mL of hydrochloric acid (4.2), heat gently to dissolve added, heating was continued to remove CO2, cooling to remove Room temperature, the solution is transferred to 500mL volumetric flask, dilute to the mark, mix, 1mL solution containing 1.000mg of calcium. 4.7 Calcium standard solution. Pipette 20.00mL calcium standard stock solution (4.6) in 200mL volumetric flask, dilute with water to volume, and mix this solution 1mL 0.1000mg containing calcium.

5 instruments and equipment

5.1 platinum dish. 5.2 Flame atomic absorption spectrometer, equipped with a calcium hollow cathode lamp, use bottled acetylene gas.

6 Sample

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

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