GB/T 22661.6-2008Chemical analysis methods of potassium fluoborade - Part 6: Determination of silica content - Molybdenum blue photometric method (English PDF)
氟硼酸钾化学分析方法 第6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 22661.6-2008 is the English-translated version of 氟硼酸钾化学分析方法 第6部分：硅含量的测定 钼蓝分光光度法.
GB/T 22661.6-2008 is the Chinese standard "Chemical analysis methods of potassium fluoborade - Part 6: Determination of silica content - Molybdenum blue photometric method".
Its scope clause reads: This section GB/T 22661 specifies the method for determination of potassium fluoroborate content of silicon. This section applies to the determination of fluorine in silicon content of potassium borate.
Measuring range. <=0.5%. Its clauses include method summary; reagents; instruments and equipment.
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Document preview — GB/T 22661.6-2008
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 22661 specifies the method for determination of potassium fluoroborate content of silicon.
This section applies to the determination of fluorine in silicon content of potassium borate. Measuring range. <=0.5%.
2 Normative references
The following documents contain provisions which, through reference GB/T 22661 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 22661.1-2008 Chemical analysis methods of potassium fluoroborate Part 1. Preparation and storage of test samples
3 Method summary
Sample with sodium carbonate and boric acid mixed solvent melt, hydrochloric acid. Points to take the test solution between pH0.85 ~ pH0.90, silicon and molybdic acid
Salt formation yellow silicon molybdenum heteropoly acid. In the high acidity sulfuric acid medium, the reducing agent is a Silicon molybdenum blue, in the spectrophotometer at a wavelength of 620nm
Measuring the absorbance.
4 Reagents
4.1
anhydrous sodium carbonate.
4.2
boric acid.
4.3 HCl
3mol/L.
Ammonium molybdate 4.4. 100g/L.
Sulfuric acid 4.5. 1 + 1.
4.6 Ascorbic acid
25g/L, the use of the preparation.
4.7
silicon standard stock solution.
Weigh 0.5000g finely pre-burning 1h at 1000 °C, and cooled in a desiccator to room temperature silicon (99.9%), placed
A platinum crucible, to which was added 5g of anhydrous sodium carbonate in the (4.1), mix well with a platinum spoon, set oven temperature at 950 °C carefully melted (about
10min), then cool, water was added to the crucible, heated slowly to dissolve completely. Cooled solution was carefully transferred to 1L volumetric flask, dilute
To the mark, and mix. Immediately poured into a polyethylene bottle. This solution 1mL containing 0.500mg silica.
4.8
Silicon standard solution.
Pipette 50.00mL silicon standard stock solution (4.7) in 500mL volumetric flask, dilute with water to volume, and mix. Immediately transferred to plastic
Bottle. This solution 1mL containing 0.0500mg silica. The solution was formulated before use now.
5 instruments and equipment
5.1 platinum dish
flat, diameter 70mm, height 35mm, with platinum cover.
5.2
furnace.
......
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 22661.7-2008 — Chemical analysis methods of potassium fluoborade - Part 7: Determiantion of sodium content - Flame atomic absorption spectrometric method
GB/T 22661.5-2008 — Chemical analysis methods of potassium fluoborade - Part 5: Determiantion of calcium content - Flame atomic absorption spectrometric method
GB/T 22661.8-2008 — Chemical analysis methods of potassium fluoborade - Part 8: Determination of free borade content - Distillation-sodium hydrogen oxidizes titration volumetric method
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