YS/T 273.9-2020Methods for chemical analysis and physical properties test of cryolite - Part 9: Determination of phosphorous pentoxide content - Molybdenum blue photometric method (English PDF)
冰晶石化学分析方法和物理性能测定方法 第9部分：五氧化二磷含量的测定 钼蓝分光光度法
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Issued by
Ministry of Industry and Information Technology of the People’s Republic of China
Level / Type
National · Recommended
Issue date
December 9, 2020
Implementation date
April 1, 2021
Scope
YS/T 273.9-2020 is the English-translated version of 冰晶石化学分析方法和物理性能测定方法 第9部分：五氧化二磷含量的测定 钼蓝分光光度法.
YS/T 273.9-2020 is the Chinese standard "Methods for chemical analysis and physical properties test of cryolite - Part 9: Determination of phosphorous pentoxide content - Molybdenum blue photometric method".
Its scope clause reads: This Part specifies the method for determination of phosphorous pentoxide in cryolite. This Part applies to the determination of phosphorous pentoxide in cryolite.
The determination range: 0.0030%~0.50%. Its clauses include method summary; reagents; apparatus; specimen; test procedures. It was issued by the Ministry of Industry and Information Technology of the People’s Republic of China on 2020-12-09 and took effect on 2021-04-01.
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Document preview — YS/T 273.9-2020
National Standard of the People's Republic of China
- ICS
- 71.100.10
- Classification
- H 30
Issued by: Ministry of Industry and Information Technology of the People’s Republic of China
Contents
- Foreword...3
- 1 Scope...5
- 2 Method Summary...5
- 3 Reagents...5
- 4 Apparatus...6
- 5 Specimen...6
- 6 Test Procedures...6
- 7 Calculation of Test Results...8
- 8 Precision...8
- 9 Quality Assurance and Control...9
- 10 Test Report...9
1 Scope
This Part specifies the method for determination of phosphorous pentoxide in cryolite.
This Part applies to the determination of phosphorous pentoxide in cryolite. The determination range: 0.0030%~0.50%.
2 Method Summary
The test material is melted by a mixed solvent of anhydrous sodium carbonate and boric acid, and acidified by sulfuric acid. Use sodium hydroxide to adjust the acidity. When the pH value is <= 0.3, add molybdic acid to form phosphomolybdenum heteropoly acid with phosphorus.
After being reduced by ascorbic acid to phosphomolybdenum blue, measure its absorbance at a wavelength of 815nm with a spectrophotometer. The content of phosphorus pentoxide is calculated using the standard curve method.
3 Reagents
Unless otherwise stated, use only reagents confirmed to be of analytically pure and distilled water or water of equivalent purity.
3.1 Sodium carbonate anhydrous.
3.2 Boric acid.
3.3 Sulfuric acid (1+1).
3.4 Acidic solution of ammonium molybdate (25 g/L): Weigh 25g of ammonium molybdate
tetrahydrate [(NH4)6Mo7O24· 4H2O] and dissolve it in 200 mL of hot water. After cooling, add about 434mL of sulfuric acid (3.3); dilute to 1L with water; and mix well. This solution is stored in polyethylene bottles.
3.5 Ascorbic acid solution (20 g/L).
3.6 Sodium hydroxide solution (200 g/L).
3.7 Phosphorus pentoxide standard storage solution: Weigh 0.1944g of sodium dihydrogen
phosphate monohydrate [NaH2PO4·H2O], dissolve it in water and transfer it to a 1L volumetric flask; dilute to the mark and mix well. 1 mL of this solution contains 100µg of phosphorus pentoxide.
3.8 Phosphorus pentoxide standard solution: Pipette 50.00mL of phosphorus pentoxide
standard storage solution (3.7) into a 500 mL volumetric flask; dilute to the mark with water;
and mix well. 1 mL of this solution contains 10µg of phosphorus pentoxide.
3.9 Phenolphthalein ethanol solution (10 g/L).
4 Apparatus
4.1 Platinum dish: diameter 70 mm, height 35 mm, with platinum lid.
4.2 High temperature furnace: capable of controlling the temperature at 850°C±20°C.
4.3 Water bath: capable of controlling the temperature at 80°C±2°C.
4.4 Spectrophotometer.
5 Specimen
The specimen is ground and mixed, and passed through a 75µm standard sieve; baked in an oven at 110°C ± 5°C for 2 h; and cooled to room temperature in a desiccator.
6 Test Procedures
6.1 Test material
Weigh the specimen (5) according to Table 1, accurate to 0.0001 g.
6.2 Parallel test
Do two experiments in parallel and take the average.
6.3 Blank test
Do a blank test along with the test material.
6.4 Determination
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 9 pages — is available in the English PDF.
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Related Standards
YS/T 273.1-2020 — Methods for chemical analysis and physical properties test of cryolite - Part 1: Determination of moisture content - Gravimetric method
YS/T 273.10-2006 — Chemical analysis methods and physical properties of cryolite. Part 10: Determination of alumina content by gravimetric method
YS/T 273.11-2023 — Methods for chemical analysis and determination of physical properties of cryolite - Part 11: Determination of element content X-ray fluorescence spectrometry
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