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YS/T 273.5-2023 English PDF (YST273.5-2006)

YS/T 273.5-2023_English: PDF (YS/T273.5-2023)
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YS/T 273.5-2023English199 Add to Cart 3 days [Need to translate] (Methods for chemical analysis and determination of physical properties of cryolite - Part 5: Determination of sodium content Flame atomic absorption spectrometry) Valid YS/T 273.5-2023
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 Obsolete YS/T 273.5-2006


BASIC DATA
Standard ID YS/T 273.5-2023 (YS/T273.5-2023)
Description (Translated English) (Methods for chemical analysis and determination of physical properties of cryolite - Part 5: Determination of sodium content Flame atomic absorption spectrometry)
Sector / Industry Nonferrous Metallurgy Industry Standard (Recommended)
Classification of Chinese Standard H30
Classification of International Standard 71.100.10
Word Count Estimation 9,952
Date of Issue 2023-12-20
Date of Implementation 2024-07-01
Summary This standard specifies the method for determination of sodium content in cryolite. This standard applies to the determination of sodium content in cryolite. The measurement range is 15.00%~35.00%.

BASIC DATA
Standard ID YS/T 273.5-2006 (YS/T273.5-2006)
Description (Translated English) Chemical analysis methods and physical properties of cryolite. Part 5: Determination of sodium by flame atomic absorption spectrometric method
Sector / Industry Nonferrous Metallurgy Industry Standard (Recommended)
Classification of Chinese Standard H21
Classification of International Standard 71.100.10
Word Count Estimation 6,670
Date of Issue 2006-05-25
Date of Implementation 2006-12-01
Older Standard (superseded by this standard) YS/T 273.5-1994
Drafting Organization Fushun Aluminum Co., Ltd.
Administrative Organization National Standardization Technical Committee of non-ferrous metals
Regulation (derived from) NDRC Notice No. 36 of 2006
Proposing organization National Nonferrous Metals Standardization Technical Committee
Issuing agency(ies) National Development and Reform Commission
Summary This standard specifies the cryolite Determination of sodium content. This standard applies to the determination of sodium cryolite. Measuring range: 20% to 35%.


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 ......

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