Download or read book YS T 273 5 2006 Translated English of Chinese Standard YS T 273 5 2006 YST273 5 2006 written by https://www.chinesestandard.net and published by https://www.chinesestandard.net. This book was released on 2023-11-11 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 (?? 1.84 g/mL). 3.2 Hydrochloric acid (?? 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. YS/T 273.5-2006 www.ChineseStandard.net ? Buy True-PDF ? A"delivery Page 6 of 8 -- Characteristic concentration: In a solution consistent with the matrix of the measured sample, the characteristic concentration of sodium shall not be

Download or read book YS T 273 10 2006 Translated English of Chinese Standard YS T 273 10 2006 YST273 10 2006 written by https://www.chinesestandard.net and published by https://www.chinesestandard.net. This book was released on 2023-10-15 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Part specifies the method for determination of alumina content in cryolite. This Part applies to the determination of alumina content in cryolite. Determination range (mass fraction): ??5.00%. 2 Method summary The fluoride salt in the test portion is dissolved in hot aluminum chloride solution; but the free Al2O3 is not dissolved. After filtering, burn and weigh. 3 Reagents 3.1 Aluminum chloride solution (130 g/L); 3.2 Acetic acid solution (1+19); 3.3 Silver nitrate solution (10 g/L). 4 Apparatus 4.1 Platinum crucible: Top diameter is about 30 mm; bottom diameter is about 20 mm; height is about 35 mm. It is equipped with platinum lid. 4.2 High-temperature furnace: It can be controlled at 900??C??20??C. 5 Test sample The test sample shall comply with the requirements of 3.3 in YS/T 273.13. YS/T 273.10-2006 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 6 of 7 6 Analytical procedure 6.1 Test portion Weigh 0.5 g of dry test sample (5), accurate to 0.0001 g. 6.2 Number of determinations It shall make two determinations independently on the same test sample; shall take the average value. 6.3 Blank test Do a blank test along with the test po

Download or read book 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 published by https://www.chinesestandard.net. This book was released on 2023-11-10 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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

Download or read book 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 published by https://www.chinesestandard.net. This book was released on 2023-11-09 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Part specifies the preparation and storage of raw and dry test samples of cryolite.

Download or read book 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 published by https://www.chinesestandard.net. This book was released on 2023-11-09 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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

Download or read book 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 published by https://www.chinesestandard.net. This book was released on 2023-10-15 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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

Download or read book 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 published by https://www.chinesestandard.net. This book was released on 2023-10-15 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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/

Download or read book 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 published by https://www.chinesestandard.net. This book was released on 2023-11-10 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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