GB/T 21994.8-2008Chemical analysis of magnesium fluoride - Part 8: Determination of sulphate content - Barium sulphate gravimetric method (English PDF)
氟化镁化学分析方法 第8部分：硫酸根含量的测定 硫酸钡重量法
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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 21994.8-2008 is the English-translated version of 氟化镁化学分析方法 第8部分：硫酸根含量的测定 硫酸钡重量法.
GB/T 21994.8-2008 is the Chinese standard "Chemical analysis of magnesium fluoride - Part 8: Determination of sulphate content - Barium sulphate gravimetric method".
Its scope clause reads: 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%. Its clauses include method summary; reagents; instruments and equipment; sample; procedure.
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Document preview — GB/T 21994.8-2008
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
- 6 Sample
- 7 Procedure
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 °C, weighed.
4 Reagents
4.1
anhydrous sodium carbonate.
4.2
boric acid.
4.3
perchloric acid (rho1.67g/mL).
4.4
sulfate (rho1.84g/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 (rho1.42g/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 °C ± 5 °C.
5.4 Furnace temperature
the temperature can be controlled at 850 °C ± 20 °C.
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.
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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