GB/T 22662.4-2008Chemical analysis methods of potassium fluotitanate - Part 4: Determination of silica content - By molybdenum blue photometric method (English PDF)
氟钛酸钾化学分析方法 第4部分：硅含量的测定 钼蓝分光光度法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 29, 2008
Implementation date
November 1, 2009
Scope
GB/T 22662.4-2008 is the English-translated version of 氟钛酸钾化学分析方法 第4部分：硅含量的测定 钼蓝分光光度法.
GB/T 22662.4-2008 is the Chinese standard "Chemical analysis methods of potassium fluotitanate - Part 4: Determination of silica content - By molybdenum blue photometric method".
Its scope clause reads: This section GB/T 22662 specifies the method for determination of fluorine in silicon content of potassium titanate. This section applies to the determination of fluorine in silicon content of potassium titanate.
Measuring range. <=0.50%. Its clauses include method summary; reagents; instruments and equipment.
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Document preview — GB/T 22662.4-2008
National Standard of the People's Republic of China
- ICS
- 77.120.10
- Classification
- H 61
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 GB/T 22662 specifies the method for determination of fluorine in silicon content of potassium titanate.
This section applies to the determination of fluorine in silicon content of potassium titanate. Measuring range. <=0.50%.
2 Normative references
The following documents contain provisions which, through reference GB/T 22662 in this section constitute provisions of this section. For dated reference documents
Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section
Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section.
GB/T 22662.1-2008 fluorine potassium titanate chemical analysis methods - Part 1. Preparation and storage of test samples
3 Method summary
After the sample was dissolved in sulfuric acid, boric acid complex fluorine, ammonium molybdate, molybdenum silicon so as to form a yellow complex ions, to further increase the acidity of [H +]
0.8mol/L or more, reduction with ascorbic acid yellow silicon molybdenum complex ions having a higher sensitivity silicon molybdenum blue, to compare on a spectrophotometer
Determination of color.
4 Reagents
Sulfuric acid 4.1. 1 + 7.
4.2 boric acid
40g/L.
4.3 ammonium molybdate solution
100g/L.
4.4 HCl
1 + 1.
4.5 ascorbic acid solution
25g/L.
4.6 silicon standard stock solution
Weigh 0.5000g finely pre-burning 1h at 1000 °C, and cooled to room temperature in the dryer two
Silicon oxide (99.9%), placed in a platinum crucible, 5g of anhydrous sodium carbonate was added thereto within a platinum spoon adequate mixing at a high temperature in the furnace
950 °C carefully melted (about 10min), then cool, water was added to the crucible, heated slowly to dissolve completely. Cooled solution was carefully transferred
1L volumetric flask, dilute to volume, and mix. Immediately poured into a polyethylene bottle. This solution 1mL containing 0.500mg silica.
4.7 Silicon standard solution
Pipette 50.0mL silica standard stock solution (4.6) in 500mL volumetric flask, dilute to the mark,
Mix well. Immediately transferred to plastic bottles. This solution 1mL containing 0.050mg silica. The solution was formulated before use now.
4.8 fluorine potassium titanate substrate solution
Weigh 0.625g excellent pure fluorine potassium titanate, after pulverized, placed in polyethylene 250mL volumetric flask, add 40 °C ~ 60 °C hot water
100mL, plus 9mL sulfuric acid (4.1), cap tightly, shake flask fluorine potassium titanate completely dissolved, boric acid was added 100mL (4.2),
Diluted with water to volume, and mix.
5 instruments and equipment
Common laboratory instruments and equipment.
......
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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Related Standards
GB/T 22662.5-2008 — Chemical analysis methods of potassium fluotitanate - Part 5: Determiantion of calcium content - Flame atomic absorption spectrometric method
GB/T 22662.3-2008 — Chemical analysis methods of potassium fluotitanate - Part 3: Determination of potassium fluotitanate content - By ammonium iron sulphate dodecahydrate titration volumetric method
GB/T 22662.6-2008 — Chemical analysis methods of potassium fluotitanate - Part 6: Determination of iron - Flame atomic absorption spectrometric method
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