GB/T 20166.2-2012 English PDFUS$169.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 20166.2-2012: Chemical analysis methods of rare earth polishing powder -- Part 2: Determination fluorine content -- Ion selective electrode analysis Status: Valid GB/T 20166.2: Historical versions
Basic dataStandard ID: GB/T 20166.2-2012 (GB/T20166.2-2012)Description (Translated English): Chemical analysis methods of rare earth polishing powder -- Part 2: Determination fluorine content -- Ion selective electrode analysis Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: H14 Classification of International Standard: 77.120.99 Word Count Estimation: 7,793 Older Standard (superseded by this standard): GB/T 20166.2-2006 Regulation (derived from): National Standards Bulletin No. 28 of 2012 Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China Summary: This standard specifies the order of cerium -based rare earth rare earth polishing powder based method for measuring the amount of fluorine. This section applies to the cerium -based rare earth -based rare earth polishing powder in fluorine content. Measu GB/T 20166.2-2012: Chemical analysis methods of rare earth polishing powder -- Part 2: Determination fluorine content -- Ion selective electrode analysis---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. ICS77.120.99 H14 National Standards of People's Republic of China Replacing GB/T 20166.2-2006 Chemical analysis methods of rare earth polishing powder Part 2. Determination of the amount of fluorine Ion Selective Electrode Part 2. Determinationfluorinecontent- Issued on. 2013-05-01 2012-11-05 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released ForewordGB/T 20166 "Methods for chemical analysis of rare earth polishing powder" is divided into two parts. --- Part 1. Determination of cerium oxide content titration; --- Part 2. Determination of the amount of fluorine ion selective electrode method. This is Part 2. This section is in accordance with GB/T 1.1-2009 given rules drafted. This Part replaces GB/T 20166.2-2006 "Methods for chemical analysis of rare earth polishing powder determining the amount of fluorine ion selective electrode law". This part of GB/T 20166.2-2006 compared to the main changes are. --- According to GB/T 1.1-2009 rules given in the text format editorial changes. This part of the National Standardization Technical Committee of rare earth (SAC/TC229) centralized. This section is responsible for drafting unit. Baotou Tianjiao Kiyomi rare earth polishing powder Ltd.. Participated in the drafting of this section. Baotou Rare Earth Research Institute, Gansu Rare Earth New Materials Co., Ltd. The main drafters of this section. Xie Bing, Liu Zhiwen, Cuiling Xiao, Li Baoying, Huangzhong Han, Gu Yanling, Xuyi Qin, Chen Xinhua, Liu Chun, Li Jia, Li Chongshan. This part of the standard replaces the previous editions are. --- GB/T 20166.2-2006. Chemical analysis methods of rare earth polishing powder Part 2. Determination of the amount of fluorine Ion Selective Electrode1 ScopeThis section GB/T 20166 specifies the determination of fluorine content of rare earth polishing powder cerium-based rare earth-based. This section applies to the determination of fluorine in the amount of rare earth polishing powder of cerium-based rare earth-based determination of the range of 0.01% to 10.0%.2 principle of the methodThe sample was molten alkali leaching filtration, fluorine and iron and rare earth hydroxide precipitation at pH 6.5 to 7.0 solution, Fluorine ion selective electrode as indicator electrode, a saturated calomel electrode as the reference electrode, measuring the value of the equilibrium potential between the two electrodes, obtained fluorine content.3 Reagents3.1 anhydrous sodium carbonate. 3.2 sodium peroxide. 3.3 Sodium hydroxide solution (10g/L). Secondary ion exchange water to 3.4. 3.5 hydrochloric acid (2.5mol/L). 3.6 sodium citrate buffer (pH 6.5 to 7.0). Weigh 294g in 1000mL beaker, sodium citrate, was added 900mL water soluble Solution, adjusting the pH meter on with hydrochloric acid (3.5) and sodium hydroxide solution (3.3) pH value of 6.5 to 7.0 and transferred to 1000mL volumetric flask, Diluted with water to the mark, mix and immediately stored in a plastic bottle. 3.7 Fluoride standard stock solution. Weigh 2.2101g superior grade pure sodium fluoride (120 ℃ drying to constant weight) in 250mL plastic bottle, plus Dissolved in water transferred to 1000mL volumetric flask, dilute with water to volume, and mix immediately stored in a plastic bottle containing the solution 1mL 1mg fluorine. 3.7.1 Fluoride standard solution. Pipette 50.00mL fluoro standard stock solution (3.7) in 500mL volumetric flask, dilute to the mark, Mix immediately stored in a plastic bottle, this solution 1mL containing 100μg fluorine. 3.7.2 Fluoride standard solution. Pipette 5.00mL fluoro standard stock solution (3.7) in 500mL volumetric flask, dilute to the mark, Mix immediately stored in a plastic bottle, this solution 1mL containing 10μg fluorine. 3.8 bromocresol green indicator (1g/L of ethanol - water). Weigh 0.1g bromocresol green dissolved in 20mL of ethanol, diluted with water to 100mL, and mix.4 Instrument4.1 pH meter. 4.2 potential measuring instrument, precision 0.1mV. 4.3 fluoride ion selective electrode. fluoride ion detection limit should be less than 2.5 × 10-4mg/mL, the electrodes prior to use in 10-3mol/L ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 20166.2-2012_English be delivered?Answer: Upon your order, we will start to translate GB/T 20166.2-2012_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. 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