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YS/T 273.5-2006 (YS/T 273.5-2023 Newer Version) PDF English


YS/T 273.5-2006 (YS/T273.5-2006, YST 273.5-2006, YST273.5-2006)
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YS/T 273.5-2023EnglishRFQ ASK 3 days (Methods for chemical analysis and determination of physical properties of cryolite - Part 5: Determination of sodium content Flame atomic absorption spectrometry) Valid
YS/T 273.5-2006English100 Add to Cart 0-9 seconds. Auto-delivery. Chemical analysis methods and physical properties of cryolite. Part 5: Determination of sodium by flame atomic absorption spectrometric method
Newer version: YS/T 273.5-2023     Standards related to (historical): YS/T 273.5-2023
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YS/T 273.5-2006: PDF in English (YST 273.5-2006)

YS/T 273.5-2006 YS NONFERROUS METAL INDUSTRY STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA ICS 71.100.10 H 21 Replacing YS/T 273.5-1994 Chemical analysis methods and physical properties of cryolite - Part 5: Determination of sodium by flame atomic absorption spectrometric method ISSUED ON: MAY 25, 2006 IMPLEMENTED ON: DECEMBER 1, 2006 Issued by: National Development and Reform Commission of PRC Table of Contents Foreword ... 3 1 Scope ... 5 2 Method summary ... 5 3 Reagents ... 5 4 Apparatus ... 5 5 Sample ... 6 6 Analysis procedure ... 6 7 Calculation of analysis results ... 7 8 Precision ... 8 9 Quality assurance and control ... 8 Foreword YS/T 273 "Chemical analysis methods and physical properties of cryolite" is divided into 13 parts: -- Part 1: Determination of moisture content - Gravimetric method; -- Part 2: Determination of ignition loss; -- Part 3: Determination of fluoride content; -- Part 4: Determination of aluminum content - EDTA titration method; -- Part 5: Determination of sodium by flame atomic absorption spectrometric method; -- Part 6: Determination of silica content by the molybdenum blue photometric; -- Part 7: Determination of iron content by orthophenantholine photometric method; -- Part 8: Determination of sulfate content - Barium sulfate gravimetric method; -- Part 9: Determination of phosphorus pentoxide content - Molybdenum blue photometric method; -- Part 10: Determination of alumina content by gravimetric method; -- Part 11: Determination of sulphur content by X-ray fluorescence spectrometric method; -- Part 12: The atomic absorption spectrophotometric method for the determination of calcium oxide content; -- Part 13: Preparation and storage of test samples. This Part is Part 5. This part is a revision of YS/T 273.5-1994. In addition to editorial modification, two chapters on Precision AND Quality Assurance and Control have been added. Other changes include: -- The measuring wavelength of the instrument is changed from the most sensitive 589.0 nm to the hypo-sensitive 589.6 nm; -- The length of the working curve is shortened, and the concentration of the highest concentration standard solution in the working curve is reduced from 10.0 μg/mL to 5.00 μg/mL; Chemical analysis methods and physical properties of cryolite - Part 5: Determination of sodium by flame atomic absorption spectrometric method 1 Scope This Part specifies the method for the determination of sodium content in cryolite. This Part applies to the determination of sodium content in cryolite. Determination range: 20%~35%. 2 Method summary After the test portion is dissolved with sulfuric acid, it is heated to remove fluorine, and the precipitate is dissolved with hydrochloric acid and water; the sodium content of the test solution is determined at the wavelength of 589.0 nm or 589.6 nm of an atomic absorption spectrometer by the use of an air-acetylene fuel-lean flame. 3 Reagents 3.1 Sulfuric acid (ρ 1.84 g/mL). 3.2 Hydrochloric acid (ρ 1.19 g/mL). 3.3 Sodium standard solution: Weigh 3.089 g of anhydrous sodium sulfate that has been dried at 120 °C and cooled in a desiccator, place it in a 250 mL beaker, and add 100 mL of water to dissolve; then, add 10 mL of hydrochloric acid (3.2), transfer the solution to a 1000 mL volumetric flask, dilute to volume with water, mix well, and transfer it to a polyethylene bottle. 1 mL of this solution contains 1.000 mg of sodium. 4 Apparatus 4.1 Platinum dish: The diameter is 80 mm, and the height is 35 mm. 4.2 Atomic absorption spectrometer: It is equipped with a sodium hollow cathode lamp. Any instrument that can meet the following indicators under the best working conditions can be used. -- Characteristic concentration: In a solution consistent with the matrix of the measured sample, the characteristic concentration of sodium shall not be greater than 0.07 ug/mL. -- Precision: Use the standard solution with the highest concentration to measure the absorbance 10 times, and the standard deviation shall not exceed 1.0% of the average absorbance; use the standard solution with the lowest concentration (not the "zero" concentration standard solution) to measure the absorbance 10 times, and the standard deviation shall not exceed 0.5% of the average absorbance of the highest concentration standard solution. -- Working curve linearity: Divide the working curve into 5 equal segments according to concentration, and the ratio of the absorbance difference in the highest segment to the absorbance difference in the lowest segment is not less than 0.85. 5 Sample The sample shall comply with the requirements of 3.3 in YS/T 273.13. 6 Analysis procedure 6.1 Test portion Weigh 0.5 g of test sample (5), accurate to 0.0001 g. 6.2 Number of determinations Two determinations shall be carried out independently and the average value shall be taken. 6.3 Blank test Do a blank test along with the sample test. 6.4 Determination 6.4.1 Place the test portion (6.1) in the platinum dish (4.1), add 5 mL of sulfuric acid (3.1), and slowly dissolve it in a sand bath (15 min~20 min) to remove fluorine; then, heat it to evaporate until the thick smoke emits; remove the test portion and cool it to room temperature; add 3 mL of hydrochloric acid (3.2) and 30 mL of water, and heat in a low-temperature sand bath until all salts are dissolved. After cooling, transfer the solution to a 500 mL volumetric flask, dilute to volume with water, and mix well. 6.4.2 According to Table 1, take the test solution (6.4.1), place it in a 500 mL volumetric ......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.