GB/T 21994.7-2008 English PDF

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GB/T 21994.7-2008: Chemical analysis of magnesium fluoride -- Part 7: Determination of iron content -- Orthophenanthroline photometric method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21994.7-2008	139	Add to Cart	3 days	Chemical analysis of magnesium fluoride -- Part 7: Determination of iron content -- Orthophenanthroline photometric method	Valid

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Basic data

Standard ID: GB/T 21994.7-2008 (GB/T21994.7-2008)
Description (Translated English): Chemical analysis of magnesium fluoride -- Part 7: Determination of iron content -- Orthophenanthroline photometric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H12
Classification of International Standard: 77.040.30
Word Count Estimation: 6,688
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, iron oxide content. This section applies to the determination of magnesium fluoride, iron trioxide. Measuring range: �� 1. 20%.

GB/T 21994.7-2008: Chemical analysis of magnesium fluoride -- Part 7: Determination of iron content -- Orthophenanthroline photometric 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 7. Determination of iron content Orthophenantholine photometric method. ICS 77.040.30 H12 National Standards of People's Republic of China Chemical analysis of magnesium fluoride Part 7. Determination of iron oxide content Phenanthroline spectrophotometry 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 7. 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 7. Determination of iron oxide content Phenanthroline spectrophotometry

1 Scope

This section provides the determination of magnesium fluoride in the amount of iron oxide. This section applies to the determination of magnesium fluoride of iron oxide. Measuring range. ≤1.20%.

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

After the sample with an alkaline flux or acid flux melt, hydroxylamine hydrochloride iron (Ⅲ) reduction, pH (3.5 ~ 4.2) in acetate buffer medium Iron (Ⅱ) with o-phenanthroline to form a colored complex, the absorbance was measured at 510nm wavelength.

4 Reagents

4.1 anhydrous sodium carbonate. 4.2 boric acid. 4.3 hydrochloride (3mol/L). 4.4 phenanthroline (2.5g/L) - hydroxylamine hydrochloride (10g/L) mixed solution. 4.5 ammonium acetate solution (200g/L). 4.6 ferric oxide standard stock solution (can choose one of two ways) 4.6.1 Weigh 2.455g ferrous ammonium sulfate hexahydrate [Fe (NH4) 2 (SO4) 2 · 6H2O] (AR), placed in 200mL beaker, add After dissolved in water, sulfuric acid was added 50mL (ρ1.84g/mL), transferred to 1000mL volumetric flask, dilute with water to volume, and mix. This standard storage Deposit 1mL solution containing 0.500mg ferric oxide. 4.6.2 Weigh 0.500g at 600 ℃ ignition advance and cooled in the dryer ferric oxide (purity of 99.90%), placed 200mL beaker, add 25mL of hydrochloric acid (ρ1.19g/mL), was slowly heated up to complete dissolution, cooled and transferred to 1000mL volumetric flask Dilute with water to volume, and mix. This standard stock solution 1mL containing 0.500mg ferric oxide. Ferric oxide 4.7 Standard Solution. Pipette 50.00mL iron sesquioxide standard stock solution (4.6), placed in 500mL volumetric flask Dilute with water to volume, and mix. This standard solution 1mL 0.0500mg containing ferric oxide. Preparation used. Paper 4.8 pH. pH 3.5 to 4.2, 0.2 unit intervals.

5 instruments and equipment

5.1 platinum dish. diameter 80mm, height 35mm, with a pan lid. 5.2 EAF. to control the temperature at 550 ℃ ± 25 ℃. 5.3 Furnace temperature. the temperature can be controlled at 850 ℃ ± 25 ℃. ......

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