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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 Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsYS/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 is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/YST273.16-2020 YS NON-FERROUS METAL INDUSTRY STANDARD OF THE PEOPLE’S 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’s Republic of China Table of ContentsForeword ... 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 ... 9ForewordYS/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 Method1 ScopeThis 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 SummaryUse 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 ReagentsUnless 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 (ρ≈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 100μg of lithium.4 ApparatusAtomic 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 0.028μg/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 SpecimenThe 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 Procedures6.1 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. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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