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YS/T 273.16-2020 English PDF (YST273.16-2020)

YS/T 273.16-2020 English PDF (YST273.16-2020)

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YS/T 273.16-2020: Methods for chemical analysis and physical properties test of cryolite - Part 16: Determination of lithium content - Flame atomic absorption spectrometric method

This Part specifies the method for determination of lithium content in cryolite. This Part applies to the determination of lithium content in cryolite. Measuring range: 0.010%~1.50%. 2 Method Summary Use perchloric acid to remove all fluorine from the test material; and then dissolve it with hydrochloric acid and water. The test solution is measured at the wavelength of 670.8 nm of the atomic absorption spectrometer using an air-acetyl block flame to measure the absorbance of lithium; and the lithium content is calculated. 3 Reagents Unless otherwise stated, only reagents and laboratory Class-III water determined to be of analytically pure are used in the analysis. 3.1 Cryolite, spectrally pure. 3.2 Perchloric acid (????1.67 g/mL). 3.3 Hydrochloric acid (1+1). 3.4 Lithium standard storage solution: Weigh 5.3228 g of lithium carbonate (spectrally pure) into a 500 mL beaker; cover with a watch plate; slowly add 125 mL of nitric acid (1+9); heat until completely dissolved; boil for a few minutes; and cool to room temperature. Transfer the solution into a 1000mL volumetric flask and dilute with water to the mark; mix well. 1mL of this solution contains 1.0mg of lithium. 3.5 Lithium standard solution: Pipette 10.00 mL of lithium standard storage solution (3.4) into a 100 mL volumetric flask; dilute to volume with water; and mix well. 1 mL of this solution YS/T 273.16-2020 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 6 of 9 contains 100??g of lithium. 4 Apparatus Atomic absorption spectrometer with lithium hollow cathode lamp. Under the best working conditions of the instrument, any instrument that can meet the following indicators can be used: --- Sensitivity: In a sol
YS/T 273.16-2020
YS
NON-FERROUS METAL INDUSTRY STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 71.100.10
H 30
Methods for Chemical Analysis and Physical Properties Test
of Cryolite ?€? Part 16: Determination of Lithium Content ?€?
Flame Atomic Absorption Spectrometric Method
ISSUED ON: DECEMBER 09, 2020
IMPLEMENTED ON: APRIL 1, 2021
Issued by: Ministry of Industry and Information Technology of the PEOPLE 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 Test Report ... 9
Foreword
YS/T 273 Chemical analysis methods and physical properties of cryolite consists of the following 17 parts:
--- Part 1: Determination of moisture content by gravimetric method;
--- Part 2: Determination of ignition loss;
--- Part 3: Determination of fluoride content;
--- Part 4: Determination of aluminum by the EDTA volumetric 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 sulphate content by barium sulphate gravimetric method; --- Part 9: Determination of phosphorous pentoxide content ?€? Molybdenum blue photometric method;
--- Part 10: Determination of alumina content by gravity 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;
--- Part 14: X-ray fluorescence spectrometric method for the determination of elements content;
--- Part 15: X-ray fluorescence spectrometric method for the determination of elements content using pressed powder tablets;
--- Part 16: Determination of lithium content ?€? Flame atomic absorption spectrometric method;
--- Part 17: Determination of elements content ?€? Inductively coupled plasma atomic emission spectrometric method.
This Part is Part 16 of YS/T 273.
Methods for Chemical Analysis and Physical Properties Test
of Cryolite ?€? Part 16: Determination of Lithium Content ?€?
Flame Atomic Absorption Spectrometric Method
1 Scope
This Part specifies the method for determination of lithium content in cryolite. This Part applies to the determination of lithium content in cryolite. Measuring range: 0.010%~1.50%.
2 Method Summary
Use perchloric acid to remove all fluorine from the test material; and then dissolve it with hydrochloric acid and water. The test solution is measured at the wavelength of 670.8 nm of the atomic absorption spectrometer using an air-acetyl block flame to measure the absorbance of lithium; and the lithium content is calculated.
3 Reagents
Unless otherwise stated, only reagents and laboratory Class-III water determined to be of analytically pure are used in the analysis.
3.1 Cryolite, spectrally pure.
3.2 Perchloric acid (?????1.67 g/mL).
3.3 Hydrochloric acid (1+1).
3.4 Lithium standard storage solution: Weigh 5.3228 g of lithium carbonate (spectrally pure) into a 500 mL beaker; cover with a watch plate; slowly add 125 mL of nitric acid (1+9); heat until completely dissolved; boil for a few minutes; and cool to room temperature. Transfer the solution into a 1000mL volumetric flask and dilute with water to the mark; mix well. 1mL of this solution contains 1.0mg of lithium.
3.5 Lithium standard solution: Pipette 10.00 mL of lithium standard storage solution (3.4) into a 100 mL volumetric flask; dilute to volume with water; and mix well. 1 mL of this solution contains 100??g of lithium.
4 Apparatus
Atomic absorption spectrometer with lithium hollow cathode lamp.
Under the best working conditions of the instrument, any instrument that can meet the following indicators can be used:
--- Sensitivity: In a solution consistent with the matrix of the measurement test material solution; the characteristic concentration of lithium shall be no greater than 0.028??g/mL; --- Precision: Use the standard solution with highest concentration to measure the absorbance for the most 10 times; and the standard deviation shall not exceed 1.0% of the average absorbance.
Use the standard solution with lowest concentration (not the solution with zero concentration) to measure the absorbance 10 times; and its standard deviation shall not exceed 0.5% of the average absorbance of the standard solution with highest concentration;
--- Standard curve linearity: In standard solutions with equal-difference concentration, the ratio of the absorbance difference on the highest segment to the absorbance difference on the lowest segment shall be no less than 0.7.
5 Specimen
The specimen is ground and mixed, and passed through a 75??m 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 0.50g of specimen (5), accurate to 0.0001g.
6.2 Parallel test
Do two experiments in parallel and take the average.
6.3 Blank test
Weigh 0.50 g of cryolite (3.1) and conduct a blank test together with the test material.

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