GB/T 12690.16-2010 English PDF

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GB/T 12690.16-2010: Chemical analysis methods of non-rare earth impurities in rare earth metals and the oxides -- Part 16: Determination of fluorine content -- Ion selective electrode analysis
Status: Valid

GB/T 12690.16: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 12690.16-2010	169	Add to Cart	3 days	Chemical analysis methods of non-rare earth impurities in rare earth metals and the oxides -- Part 16: Determination of fluorine content -- Ion selective electrode analysis	Valid
GB/T 12690.16-1990	199	Add to Cart	2 days	Rare-earth metals and their oxides--Determination of calcium content--Flame atomic absorption spectrometric method	Obsolete

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Basic data

Standard ID: GB/T 12690.16-2010 (GB/T12690.16-2010)
Description (Translated English): Chemical analysis methods of non-rare earth impurities in rare earth metals and the oxides -- Part 16: Determination of 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: 7,720
Date of Issue: 1/14/2011
Date of Implementation: 11/1/2011
Regulation (derived from): Announcement of Newly Approved National Standards No. 2 of 2011
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 amount of rare earth metals and the determination of fluorine in the oxide. This Standard is applicable to the determination of fluorine content of rare earth metals and oxides. Measurement range: 0. 010 to 0. 50%.

GB/T 12690.16-2010: Chemical analysis methods of non-rare earth impurities in rare earth metals and the oxides -- Part 16: Determination of 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.
Chemical analysis methods of non-rare earth impurities in rare earth metals and the oxides Part 16. Determination of fluorine content Ion selective electrode analysis ICS 77.120.99 H14 National Standards of People's Republic of China Non - rare earth impurities in rare earth metals and their oxides Methods for chemical analysis Part 16. Determination of the amount of fluorine Ion Selective Electrode Part 16. Determinationoffluorinecontent- Issued on. 2011-11-01 2011-01-14 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

GB/T 12690 "non - rare earth impurities in rare earth metals and their oxides chemical analysis method" is divided into 17 parts. --- Part 1. Carbon and sulfur content was measured high-frequency infrared method; --- Part 2. Determination of the weight loss on ignition; --- Part 3. rare earth oxide in water content - Gravimetric method; --- Part 4. oxygen, nitrogen pulse measurement - infrared absorption method and pulse - heating thermal conductivity; --- Part 5. aluminum, chromium, manganese, iron, cobalt, nickel, copper, zinc, lead content was measured; --- Part 6. Determination of iron content of potassium thiocyanate, 1,10-phenanthroline spectrophotometry; --- Part 7. Determination of silicon content - Molybdenum blue spectrophotometric method; --- Part 8. Determination of sodium content by flame atomic absorption spectrometry; --- Part 9. Determination of chlorine content of silver nitrate turbidimetry; --- Part 10. Determination of phosphorus content - Molybdenum blue spectrophotometric method; --- Part 11. Determination of magnesium content - Flame atomic absorption spectrometry; --- Part 12. Determination of the amount of thorium; --- Part 13. Determination of tungsten, molybdenum content; --- Part 14. Determination of titanium content; --- Part 15. Determination of calcium; --- Part 16. Determination of the amount of fluorine ion selective electrode; --- Part 17. rare earth metals niobium and tantalum contents. This is Part 16. This part of the National Standardization Technical Committee of rare earth (SAC/TC229) centralized. This part by the Beijing Nonferrous Metal Research Institute, China Nonferrous Metals Industry Institute of Standards Metrology and Quality is responsible for drafting. This section was drafted by the Beijing Nonferrous Metal Research Institute. This section is Baotou Rare Earth Research Institute, Ganzhou Qiandong Rare Earth Group Co., Ltd. participated in the drafting. The main drafters of this section. Yang Ping, Chen Yun red. The drafters of some of the participants. high Lizhen, Nam Hung Yao, Wang Anli, Qian Hao, Chen Jie, Zhu Ni. Non - rare earth impurities in rare earth metals and their oxides Methods for chemical analysis Part 16. Determination of the amount of fluorine Ion Selective Electrode

1 Scope

GB/T 12690 provisions of this part of the determination of rare earth metals and oxides of fluorine content. This section applies to the determination of fluorine content of rare earth metals and oxides. Measurement range. 0.010% to 0.50%.

2 principle of the method

After the sample is dissolved in dilute nitric acid by adding an excess of sodium hydroxide, the separation of fluorine and iron, rare earth and so on. In the solution of pH6.5 ~ 7.0, fluorine Ion selective electrode as indicator electrode, a saturated calomel electrode as the reference electrode, the electrode potential value measured balance between the two poles, with Grignard mapping Obtained fluorine content.

3 Reagents

3.1 Hydrogen peroxide (30%). 3.2 nitric acid (13). 3.3 Sodium hydroxide solution (300g/L). 3.4 Sodium hydroxide solution (50g/L). 3.5 sodium citrate buffer (300g/L). 3.6 fluoro standard stock solution. Weigh 2.2101g superior grade pure sodium fluoride (120 ℃ drying to constant weight) in 250mL plastic beaker, add water After dissolution 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 fluoro standard solution. Pipette 10.00mL fluoro standard stock solution (3.6) in 100mL volumetric flask, dilute to the mark with water, mix, Now stored in plastic bottles. This solution 1mL containing 100μg fluorine. 3.8 fluoro standard solution. Pipette 20.00mL fluoro standard solution (3.7) in 100mL volumetric flask, dilute with water to volume, and mix immediately Stored in plastic bottles. This solution 1mL containing 20μg fluorine. 3.9 bromocresol green indicator (1g/L). Weigh 0.1g bromocresol green dissolved in 20mL of ethanol, diluted with water to 100mL, and mix.

4 Equipment

4.1 potential measuring instrument, precision 0.1mV. 4.2 fluoride ion selective electrode. fluoride ion detection limit should be less than 2.5 × 10-4mg/mL, the electrodes before use in 1 × 10-3mol/L NaF solution soak for more than 1h, so that activation, and then washed with water until the determination can be carried out after the electrode potential of not greater than -370mV. 4.3 pairs of junction saturated calomel electrode. ......

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