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GB/T 22660.6-2008: Chemical analysis methods of lithium fluoride -- Part 6: Determination of silica content -- Molybdenum blue photometric method
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| GB/T 22660.6-2008 | English | 139 |
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Chemical analysis methods of lithium fluoride -- Part 6: Determination of silica content -- Molybdenum blue photometric method
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GB/T 22660.6-2008
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Basic data | Standard ID | GB/T 22660.6-2008 (GB/T22660.6-2008) | | Description (Translated English) | Chemical analysis methods of lithium fluoride -- Part 6: Determination of silica content -- Molybdenum blue photometric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H60 | | Classification of International Standard | 77.120 | | Word Count Estimation | 6,621 | | Date of Issue | 2008-12-29 | | Date of Implementation | 2009-11-01 | | Quoted Standard | GB/T 22660.1-2008 | | Regulation (derived from) | National Standard Approval Announcement 2008 No.23 (Total No.136) | | 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 lithium fluoride in silica content. This section applies to the determination of lithium fluoride, silica content. Measuring range: 0. 01 to 0. 40%. | GB/T 22660.6-2008: Chemical analysis methods of lithium fluoride -- Part 6: Determination of silica content -- Molybdenum blue photometric method
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Chemical analysis methods of lithium fluoride Part 6. Determination of silica content Molybdenum blue photometric method.
ICS 77.120
H60
National Standards of People's Republic of China
Methods for chemical analysis of lithium fluoride
Part 6. Determination of silica content
Molybdenum blue spectrophotometric method
Posted 2008-12-29
2009-11-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 22660 "Methods for chemical analysis of lithium 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 by flame atomic absorption spectrometry;
--- 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 section GB/T Part of 622,660.
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 responsible for drafting unit. Fluoride Chemicals Co., Ltd., China Nonferrous Metals Industry Standards and Metrology Institute for Quality.
Participated in the drafting of this section. Hunan Nonferrous fluorine chemical limited liability company, Aluminum Corporation of China Zhengzhou Research Institute.
The main drafters of this section. Han Shijun, teacher Vicky, Zhou Xiaoping, Li Yongqiang, Wang Hongxing, Yang Caixia, Zhu Liang, Li Zhijian, even Mingxia, INNER.
Methods for chemical analysis of lithium fluoride
Part 6. Determination of silica content
Molybdenum blue spectrophotometric method
1 Scope
This section GB/T 22660 specifies the method for determination of silicon dioxide content of lithium fluoride.
This section applies to the determination of lithium fluoride, silica content. Measuring range. 0.01 to 0.40%.
2 Normative references
The following documents contain provisions which, through reference GB/T 22660 in this section constitute provisions of this section. For dated reference documents
Member, all subsequent amendments (not including errata content) or revised edition are not adapted to this section, however, encouraged to reach under this section
Parties to research agreement to use the latest versions of these documents. For undated references, the latest edition of this adaptation
section.
GB/T 22660.1-2008 Chemical analysis methods of lithium fluoride - Part 1. Preparation and storage of test samples.
3 Method summary
Sample with sodium carbonate and boric acid mixed solvent melt, acidified with nitric acid. Adjust the pH from 0.85 to 0.90 when added sodium molybdate silicon to form a silicon
Heteropolyoxomolybdate. Tartaric acid in the presence of high acidity sulfuric acid medium, silicon molybdenum heteropoly acid by a reducing agent ascorbic acid is reduced to molybdenum blue, in points
815nm wavelength spectrophotometer measured absorbance.
4 Reagents
4.1 anhydrous sodium carbonate.
4.2 boric acid.
Nitrate 4.3 (8mol/L).
4.4 Sodium molybdate solution (195g/L). Weigh 19.5g of sodium molybdate dihydrate (NaMo4 · 2H2O), placed in a plastic cup with water and dissolved,
Diluted to 100mL, and mix. Stored in polyethylene bottles.
4.5 tartaric acid solution (100g/L).
4.6 sulfuric acid solution (8mol/L).
4.7 Ascorbic acid (20g/L).
4.8 silica standard stock solution. Weigh 0.5000g (accurate to 0.0001g) in advance and placed in 1h 1000 ℃ burning dry
Desiccator cooling to room temperature silica [(SiO2) > 99.9%] and 5g of anhydrous sodium carbonate (4.1), placed in a platinum crucible and mix. Place
950 ℃ high temperature furnace to melt molten transparent. Cooled, heated with hot water until completely dissolved frit. Moved into 1L volumetric flask, dilute to the mark
Degree, and mix. Immediately transferred to plastic bottles. This silica-containing solution 1mL 0.50mg.
4.9 silica standard solution. Pipette 10.00mL silica standard stock solution (4.8), placed in 1L volumetric flask, dilute with water to
Volume, and mix. Immediately transferred to plastic bottles. The concentration of the solution is a silica. 5μg/mL. Before using now formulated.
5 instruments and equipment
5.1 platinum and platinum dish lid. diameter 70mm, height 35mm.
5.2 Furnace temperature. the temperature can be controlled at 550 ℃ ± 25 ℃.
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