GB/T 21994.7-2008Chemical analysis of magnesium fluoride - Part 7: Determination of iron content - Orthophenantholine photometric method (English PDF)
氟化镁化学分析方法 第7部分：三氧化二铁含量的测定 邻二氮杂菲分光光度法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
June 9, 2008
Implementation date
December 1, 2008
Scope
GB/T 21994.7-2008 is the English-translated version of 氟化镁化学分析方法 第7部分：三氧化二铁含量的测定 邻二氮杂菲分光光度法.
GB/T 21994.7-2008 is the Chinese standard "Chemical analysis of magnesium fluoride - Part 7: Determination of iron content - Orthophenantholine photometric method".
Its scope clause reads: 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%. Its clauses include method summary; reagents; instruments and equipment.
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Document preview — GB/T 21994.7-2008
National Standard of the People's Republic of China
- ICS
- 77.040.30
- Classification
- H 12
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Normative references
- 3 Method summary
- 4 Reagents
- 5 instruments and equipment
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 (rho1.84g/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 °C ignition advance and cooled in the dryer ferric oxide (purity of 99.90%), placed
200mL beaker, add 25mL of hydrochloric acid (rho1.19g/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 °C ± 25 °C.
5.3 Furnace temperature
the temperature can be controlled at 850 °C ± 25 °C.
GB/T 20975.28-2019 | GB/T 20975.29-2019 | GB/T 20975.30-2019 | GB/T 21994.4-2008 | GB/T 21994.3-2008 | GB/T 21994.2-2008 | […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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