YS/T 273.9-2020 PDF English

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YS/T 273.9-2020: Methods for chemical analysis and physical properties test of cryolite - Part 9: Determination of phosphorous pentoxide content - Molybdenum blue photometric method
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YS/T 273.9: Historical versions

Standard ID	USD	BUY PDF	Delivery	Standard Title (Description)	Status
YS/T 273.9-2020	80	Add to Cart	Auto, 9 seconds.	Methods for chemical analysis and physical properties test of cryolite - Part 9: Determination of phosphorous pentoxide content - Molybdenum blue photometric method	Valid
YS/T 273.9-2006	239	Add to Cart	3 days	Chemical analysis methods and physical properties of cryolite. Part 9: Determination of phosphorous pentoxide by molybdenum blue photometric method	Obsolete

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YS/T 273.9-2020: Methods for chemical analysis and physical properties test of cryolite - Part 9: Determination of phosphorous pentoxide content - Molybdenum blue photometric method

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YS NON-FERROUS METAL INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.100.10 H 30 Replacing YS/T 273.9-2006 Methods for Chemical Analysis and Physical Properties Test of Cryolite – Part 9: Determination of Phosphorous Pentoxide Content – Molybdenum Blue Photometric Method ISSUED ON: DECEMBER 09, 2020 IMPLEMENTED ON: APRIL 1, 2021 Issued by: Ministry of Industry and Information Technology of the People’s Republic of China

Table of 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 Methods for Chemical Analysis and Physical Properties Test of Cryolite – Part 9: Determination of Phosphorous Pentoxide Content – Molybdenum Blue Photometric Method

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 ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.

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