GB/T 22661.6-2008 English PDF

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GB/T 22661.6-2008: Chemical analysis methods of potassium fluoborate -- Part 6: Determination of silica content -- Molybdenum blue photometric method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 22661.6-2008	139	Add to Cart	3 days	Chemical analysis methods of potassium fluoborate -- Part 6: Determination of silica content -- Molybdenum blue photometric method	Valid

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Basic data

Standard ID: GB/T 22661.6-2008 (GB/T22661.6-2008)
Description (Translated English): Chemical analysis methods of potassium fluoborate -- Part 6: Determination of silica content -- Molybdenum blue photometric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H61
Classification of International Standard: 77.120.10
Word Count Estimation: 6,643
Date of Issue: 2008-12-29
Date of Implementation: 2009-11-01
Quoted Standard: GB/T 22661.1-2008
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 boric acid and potassium fluoride silicon content. This section applies to the determination of fluorine in the silicon content of Potassium. Measuring range: �� 0. 5%.

GB/T 22661.6-2008: Chemical analysis methods of potassium fluoborate -- Part 6: Determination of silica content -- Molybdenum blue photometric method

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Chemical analysis methods of potassium fluoborade.Part 6. Determination of silica content.Molybdenum blue photometric method ICS 77.120.10 H61 National Standards of People's Republic of China Chemical analysis methods of potassium fluoroborate Part 6. Determination of silicon 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 22661 "potassium fluoroborate chemical analysis method" is divided into 10 parts. --- Part 1. Preparation and storage of test samples; --- Part 2. Determination of the weight of water in the wet method; --- Part 3. Determination of potassium fluoride boric acid sodium hydroxide 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 content - Molybdenum blue spectrophotometric method; --- Part 7. Determination of sodium content by flame atomic absorption spectrometry; --- Part 8. Determination of the free boronic acid sodium volumetric method; --- Part 9. Determination of the chlorine content of mercuric nitrate volumetric method; --- Part 10. Determination of phosphorus pentoxide content - Molybdenum blue spectrophotometric method. This section GB/T 22661 Part 6. 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 drafted. Hunan Nonferrous fluorine chemical limited liability company. Participated in the drafting of this section. Fluoride Chemicals Co., Ltd., Zhengzhou Research Institute, Aluminum Corporation of China, Hengyang City State Friends Chemical Technology Co., Ltd. The main drafters of this section. Li Zhijian, Zhu Liang, Liao Zhihui, Shi Xiuhua, Wang Hui, Li Yongqiang, Feng Jingdong, Liu Zhihong Huang Ju in particular, Liu Min. Chemical analysis methods of potassium fluoroborate Part 6. Determination of silicon content Molybdenum blue spectrophotometric method

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 ℃, 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 ℃ 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. ......

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