Ys T 273 4 2020 Translated English Of Chinese Standard Ys T 273 4 2020 Yst273 4 2020
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Ys T 273 4 2020 Translated English Of Chinese Standard Ys T 273 4 2020 Yst273 4 2020
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Release Date : 2023-10-15
Ys T 273 4 2020 Translated English Of Chinese Standard Ys T 273 4 2020 Yst273 4 2020 written by https://www.chinesestandard.net and has been published by https://www.chinesestandard.net this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-10-15 with Technology & Engineering categories.
This Part specifies the method for determination of aluminum content in cryolite. This section applies to the determination of aluminum content in cryolite. Measurement range: 9.00% ~ 20.00%. 2 Method summary The sample is melted with acidic potassium sulfate or potassium pyrosulfate, to remove fluorine; the frit is dissolved with hydrochloric acid. Take a portion of the test solution. Add excess Na2EDTA, to form a complex between the aluminum element and EDTA. Under weakly acidic conditions, use xylenol orange as an indicator. Use zinc nitrate standard titration solution, to titrate the excess Na2EDTA. Add sodium fluoride. Heat to displace EDTA. Then use zinc nitrate standard solution, to titrate the released EDTA. Calculate the aluminum content by using the millimeters of zinc nitrate standard titration solution, which is consumed in the titration. 3 Reagents Unless otherwise stated, only reagents and deionized water determined to be of analytical grade are used in the analysis. 3.1 Acid potassium sulfate or potassium pyrosulfate. 3.2 Sodium fluoride. 3.3 Hydrochloric acid (1 + 1). 3.4 Hydrochloric acid (1 + 3). 3.5 Sodium hydroxide solution (100 g/L). 3.6 Buffer solution (pH value 5.6): Weigh 333 g sodium acetate trihydrate. Dissolve in water. Add 15 mL of glacial acetic acid. Use water to dilute it to 1000 mL. Mix well. YS/T 273.4-2020 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 6 of 9 3.7 Na2EDTA solution (0.05 mol/L): Weigh 9.3 g of disodium ethylenediaminetetraacetate (Na2EDTA) into a 250 mL beaker. Add 100 mL of water. Heat to dissolve. Cool slightly. Use water to dilute to 500 mL. Mix well. 3.8 Zinc nitrate standard titration solution (approximately 0.01853 mol/L): - Pretreatment: Place about 10 g of zinc particles (wZn ¡Ý 99.99%) in a 250 mL beaker. Add about 100 mL of water. Add a small amount of nitric acid (1 + 1). Stir to dissolve the oxides on the surface of the zinc particles. When the zinc particle is bright silvery white. pour off ...
Ys T 273 1 2020 Translated English Of Chinese Standard Ys T 273 1 2020 Yst273 1 2020
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Ys T 273 1 2020 Translated English Of Chinese Standard Ys T 273 1 2020 Yst273 1 2020 written by https://www.chinesestandard.net and has been published by https://www.chinesestandard.net this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-10-15 with Technology & Engineering categories.
This Part specifies the method for determination of moisture content in cryolite. This Part applies to the determination of moisture content in cryolite. Measuring range: ?? 1.50%. 2 Method summary After the sample is dried in the oven, the difference in mass of the sample before and after drying is calculated, which is the moisture content of the sample. 3 Instruments 3.1 Weighing bottle: The diameter is 45 mm; it is flat type, which has a lid. 3.2 Oven: It is capable of controlling the temperature at 110 ??C ?? 5 ??C. 3.3 Dryer. 4 Specimens The specimens shall be kept in a sealed container. It shall mixed thoroughly before weighing. 5 Analytical steps 5.1 Sample Weigh 5.0 g of specimen (4), accurate to 0.0001 g. 5.2 Parallel test Do two tests in parallel. Take the average value. YS/T 273.1-2020 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 6 of 7 5.3 Determination 5.3.1 Put the weighing bottle (3.1) into the oven (3.2), at 110 ??C ?? 5 ??C, to dry it for 2 hours. Cool it to room temperature, in the desiccator (3.3). Repeat this cycle, until the weight is constant. Weigh it. 5.3.2 Spread the sample (5.1) evenly on the bott
Ys T 273 16 2020 Translated English Of Chinese Standard Ys T 273 16 2020 Yst273 16 2020
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Ys T 273 16 2020 Translated English Of Chinese Standard Ys T 273 16 2020 Yst273 16 2020 written by https://www.chinesestandard.net and has been published by https://www.chinesestandard.net this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-10-15 with Technology & Engineering categories.
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 3 2020 Translated English Of Chinese Standard Ys T 273 3 2020 Yst273 3 2020
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Ys T 273 3 2020 Translated English Of Chinese Standard Ys T 273 3 2020 Yst273 3 2020 written by https://www.chinesestandard.net and has been published by https://www.chinesestandard.net this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-10-15 with Technology & Engineering categories.
This Part specifies the method for determination of chlorine content in cryolite. This Part is applicable to the determination of chlorine content in cryolite. The determination range is: 40.00% ~ 60.00%. The "Distillation - Thorium nitrate titration method" is the arbitration method. 2 Distillation - Thorium nitrate titration method 2.1 Summary of methods Dissolve the sample with sodium carbonate. Separate the chlorine, through sulfuric acid (or perchloric acid)-steam distillation. Use sodium alizarin sulfonate-methylene blue as the indicator. Use thorium nitrate solution for titration, to calculate the fluorine content in the sample. 2.2 Reagents Unless otherwise stated, only reagents and deionized water determined to be of analytical grade are used in the analysis. 2.2.1 Anhydrous sodium carbonate, superior grade pure. 2.2.2 Perchloric acid (p ¡Ö l.60 g/mL). 2.2.3 Hydrochloric acid (1 + 199). 2.2.4 Sodium hydroxide solution (20 g/L). 2.2.5 Sulfuric acid (2 + 1). 2.2.6 Buffer solution (pH value 2.7): Weigh 9.45 g of monochloroacetic acid. Dissolve in 50 mL of sodium hydroxide (1 mol/L). Use water to dilute it to 100 mL. Mix well. 2.2.7 Thorium nitrate standard titration solution: - Preparation: Weigh 4.5 g of thorium nitrate tetrahydrate [Th(NO3)4 ? 4H2O]. Use YS/T 273.3-2020 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 6 of 14 water to dissolve it. Dilute it to 1 L. Mix well. - Calibration: Weigh 0.2800 g of anhydrous sodium chlorine (preliminarily burned at 600 ¡ãC and cooled to room temperature in a desiccator). Use 20 mL ~ 30 mL of w
Ys T 273 8 2020 Translated English Of Chinese Standard Ys T 273 8 2020 Yst273 8 2020
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Ys T 273 8 2020 Translated English Of Chinese Standard Ys T 273 8 2020 Yst273 8 2020 written by https://www.chinesestandard.net and has been published by https://www.chinesestandard.net this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-10-15 with Technology & Engineering categories.
This Part specifies the method for determination of sulfate content in cryolite. This Part applies to the determination of sulfate content in cryolite. Determination range: 0.10%~1.50%. 2 Method Summary The test material is melted by a mixed flux of sodium carbonate and boric acid; and the melt is dissolved by perchloric acid. In the acidic medium, barium chloride is used to precipitate sulfate ions. The precipitated barium sulfate is burned at 850¡ãC and weighed. Calculate sulfate content. 3 Reagent Unless otherwise stated, only reagents and deionized water determined to be of analytically pure were used in the analysis. 3.1 Anhydrous sodium carbonate. 3.2 Boric acid. 3.3 Perchloric acid (¦Ñ¡Ö1.67 g/mL). 3.4 Sulfuric acid (¦Ñ=1.84 g/mL). 3.5 Hydrochloric acid (1+1). 3.6 Barium chloride solution: Weigh 61g of barium chloride dihydrate, dissolve it in water and dilute it to 1L. 3.7 Silver nitrate-nitric acid solution: Weigh 0.5 g of silver nitrate and dissolve it in a small amount of water; add 10 mL of nitric acid (¦Ñ = 1. 40 g/mL), dilute with water to 100 mL, and mix well. YS/T 273.8-2020 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 6 of 9 4 Apparatus 4.1 Platinum dish: flat bottom, diameter 75 mm, height 30 mm, with platinum cover. 4.2 Platinum crucible: diameter 30 mm, height 30 mm. 4.3 Oven: The temperature can be controlled at 110¡ãC¡À5¡ãC. 4.4 High temperature furnace: The temperature can be c
Ys T 273 9 2020 Translated English Of Chinese Standard Ys T 273 9 2020 Yst273 9 2020
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Ys T 273 9 2020 Translated English Of Chinese Standard Ys T 273 9 2020 Yst273 9 2020 written by https://www.chinesestandard.net and has been published by https://www.chinesestandard.net this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-10-15 with Technology & Engineering categories.
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 ¡Ü 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). YS/T 273.9-2020 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 6 of 9 3.6 Sodium hydroxide solution (200 g/
Ys T 273 15 2012 Translated English Of Chinese Standard Ys T 273 15 2012 Yst273 15 2012
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Ys T 273 15 2012 Translated English Of Chinese Standard Ys T 273 15 2012 Yst273 15 2012 written by https://www.chinesestandard.net and has been published by https://www.chinesestandard.net this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-11-10 with Technology & Engineering categories.
This Part of YS/T 273 specifies the X-ray fluorescence spectrometric method for the determination of contents of fluorine, aluminum, sodium, silicon, iron, sulfur, phosphorus and calcium (respectively represented by F, Al, Na, SiO2, Fe2O3, SO42-, P2O5, CaO) and other elements in cryolite using pressed powder tables. This Part is applicable to the determination of fluorine, aluminum, sodium, silicon, iron, sulfur, phosphorus, calcium and other elements in cryolite. The measurement range is shown in Table 1. Table 1
Ys T 273 2 2006 Translated English Of Chinese Standard Ys T 273 2 2006 Yst273 2 2006
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Ys T 273 2 2006 Translated English Of Chinese Standard Ys T 273 2 2006 Yst273 2 2006 written by https://www.chinesestandard.net and has been published by https://www.chinesestandard.net this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-11-10 with Technology & Engineering categories.
This Part specifies the method for determination of cryolite ignition loss. This Part applies to the determination of cryolite ignition loss. Determination range: ??6.00%. 2 Method summary The sample is burned at 550 ??C??5 ??C for 30 minutes. The amount of mass reduction after burning is the ignition loss. 3 Apparatus 3.1 High-temperature furnace: The temperature can be controlled at 550 ??C??5 ??C. 3.2 Platinum crucible: The diameter is 30 mm, the height is 40 mm, and it has a lid. 4 Test sample The sample shall comply with the requirements of 3.2 in YS/T 273.13. 5 Analysis procedure 5.1 Test portion Weigh 2.5 g of dry test sample (4), accurate to 0.0001 g. 5.2 Number of determinations Two determinations shall be carried out independently and the average value shall be taken. 5.3 Determination 5.3.1 Turn on the high-temperature furnace (3.1), adjust the furnace temperature to YS/T 273.2-2006 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery Page 6 of 7 550 ??C??5 ??C, and start the determination after the temperature remains constant for 20 minutes. 5.3.2 According to the requirements of 5.1, accurately weigh the test porti
Ys T 273 13 2006 Translated English Of Chinese Standard Ys T 273 13 2006 Yst273 13 2006
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Ys T 273 13 2006 Translated English Of Chinese Standard Ys T 273 13 2006 Yst273 13 2006 written by https://www.chinesestandard.net and has been published by https://www.chinesestandard.net this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-11-09 with Technology & Engineering categories.
This Part specifies the preparation and storage of raw and dry test samples of cryolite.
Ys T 273 12 2006 Translated English Of Chinese Standard Ys T 273 12 2006 Yst273 12 2006
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Ys T 273 12 2006 Translated English Of Chinese Standard Ys T 273 12 2006 Yst273 12 2006 written by https://www.chinesestandard.net and has been published by https://www.chinesestandard.net this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-11-09 with Technology & Engineering categories.
This Part specifies the method for determination of calcium oxide content in cryolite. This Part applies to the determination of calcium oxide in cryolite. Determination range (mass fraction): ??1.25%. 2 Method summary Use perchloric acid to de-fluorinate the test portion; heat until the smoke of perchloric acid has evaporated, then use hydro