GB/T 12690.19-2018 English PDF

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GB/T 12690.19-2018: Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides -- Part 19: Determination of arsenic and mercury contents
Status: Valid

GB/T 12690.19: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 12690.19-2018	199	Add to Cart	3 days	Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides -- Part 19: Determination of arsenic and mercury contents	Valid
GB/T 12690.19-1990	199	Add to Cart	2 days	Rare-earth metals and their oxides--Determination of iron content--1, 10-phenanthroline spectrophotometric method	Obsolete

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GB/T 11064.9   GB/T 11064.2   GB/T 13747.5   GB/T 12690.20   GB/T 12690.21   GB/T 12690.12   

Basic data

Standard ID: GB/T 12690.19-2018 (GB/T12690.19-2018)
Description (Translated English): Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides -- Part 19: Determination of arsenic and mercury contents
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H14
Classification of International Standard: 77.120.99
Word Count Estimation: 10,186
Date of Issue: 2018-09-17
Date of Implementation: 2019-06-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 12690.19-2018: Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides -- Part 19: Determination of arsenic and mercury contents

---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 for non-rare earth impurities of rare earth metals and their oxides - Part 19. Determination of arsenic and mercury contents ICS 77.120.99 H14 National Standards of People's Republic of China Non-rare earth impurities in rare earth metals and their oxides Chemical analysis method Part 19. Determination of arsenic and mercury Part 19.Determinationofarsenicandmercurycontents Published on.2018-09-17 2019-06-01 implementation State market supervision and administration China National Standardization Administration issued

Foreword

GB/T 12690 "Chemical Analysis Methods for Non-rare Earth Impurities in Rare Earth Metals and Their Oxides" is divided into 19 parts. --- Part 1. Determination of carbon and sulfur content - High frequency - infrared absorption method; --- Part 2. Determination of the amount of ignition in rare earth oxides; ---Part 3. Determination of moisture content in rare earth oxides; --- Part 4. Determination of oxygen and nitrogen - pulse - infrared absorption method and pulse - heat conduction method; ---Part 5. Determination of cobalt, manganese, lead, nickel, copper, zinc, aluminum, chromium, magnesium, cadmium, vanadium, iron; ---Part 6. Determination of iron content - Potassium thiocyanate, 1,10- phenanthroline spectrophotometric method; --- 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 - silver nitrate turbidimetric method; ---Part 10. Determination of phosphorus content - Molybdenum blue spectrophotometric method; ---Part 11. Determination of magnesium content by flame atomic absorption spectrometry; --- Part 12. Determination of enthalpy; --- Part 13. Determination of the amount of molybdenum and tungsten; --- Part 14. Determination of the amount of titanium; ---Part 15. Determination of calcium content; ---Part 16. Determination of fluorine content - Ion selective electrode method; --- Part 17. Determination of bismuth and strontium in rare earth metals; ---Part 18. Determination of the amount of zirconium; --- Part 19. Determination of the amount of arsenic and mercury. This part is the 19th part of GB/T 12690. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part is proposed and managed by the National Rare Earth Standardization Technical Committee (SAC/TC229). This section drafted by. National Tungsten and Rare Earth Products Quality Supervision and Inspection Center, Jidong Rare Earth Group Co., Ltd. (Zhangzhou Aike Rui Testing Technology Co., Ltd.), Zhangzhou Nonferrous Metallurgy Research Institute, North China Rare Earth (Group) High-Tech Co., Ltd., National Standard (Beijing) Inspection Certification Co., Ltd., Quannan County New Resources Rare Earth Co., Ltd., Baotou Rare Earth Research Institute, Dingnan Dahua New Materials Resources Co., Ltd., China Testing Technology Research Institute, China Nonferrous Guilin Mineral Geology Research Institute Co., Ltd., Guangdong Industrial Analysis and Testing Center, Steel Research Institute Technology Co., Ltd. The main drafters of this section. Li Ping, Xu Na, Song Xudong, Li Jianguo, Chen Wen, Ling Honghuan, Xie Min, Tang Ying, Wen Bin, Zhang Guimei, He Jing, Tian Jia, Chen Yan, Gao Lihong, Yao Nanhong, Lu Wei, Chen Tianlian, Zhou Wei, Chen Zhubing, Liu Pengyu, Yan Life, Yang Chunhong, Zhang Wei, Du Mei, Sun Yuxi, Zhang Xiuyan, Liu Tianping, Li Zhiyong, Jiao Zhibin, Xiong Xiaoyan, Dong Tao, Gong Wannian, Wang Jin, Liu Liyuan. Non-rare earth impurities in rare earth metals and their oxides Chemical analysis method Part 19. Determination of arsenic and mercury

1 Scope

This part of GB/T 12690 specifies the method for determining the amount of arsenic and mercury in rare earth metals and their oxides. This section applies to the determination of the amount of arsenic and mercury in rare earth metals and their oxides. A total of 2 methods are included. Method 1 Inductively Coupled Plasma Mass spectrometry, method 2 atomic fluorescence method. Method 1 measurement range. 0.00005%~0.010%, method 2 measurement range. arsenic 0.00005%~ 0.010%; mercury 0.000005%~0.0010%. When method 1 and method 2 overlap in the measurement range, method 2 is used as arbitration. method. 2 Method 1. Inductively coupled plasma mass spectrometry 2.1 Principle of the method The sample is dissolved in nitric acid, and the argon plasma is used as the ionization source in the dilute nitric acid medium, and the standard mode and the reaction gas mode are used for direct measurement. Determine the base interference to correct the matrix interference. 2.2 Reagents 2.2.1 Hydrogen peroxide (30%), excellent grade. 2.2.2 Nitric acid (1 1). 2.2.3 Nitric acid (1 3). 2.2.4 Nitric acid (2 98). 2.2.5 Sodium hydroxide, excellent grade. 2.2.6 sodium hydroxide solution (100g/L). 2.2.7 Arsenic standard storage solution. accurately weigh 0.1320g of arsenic trioxide dried to constant weight in a sulfuric acid dryer, warmly dissolved in hydrogen and oxygen Sodium solution (2.2.6), transfer to a 1000mL volumetric flask, dilute to the mark with water, and mix. 1 mL of this solution contained 100 μg of arsenic. 2.2.8 Mercury standard storage solution. accurately weigh 0.1350g of mercury chloride, dissolve it in water, transfer it to a 1000mL volumetric flask and dilute it to the mark with water. Mix well. 1 mL of this solution contained 100 μg of mercury. 2.2.9 铋 standard storage solution. accurately weigh 0.2320g lanthanum nitrate, dissolve it with 10mL nitric acid solution (2.2.4), and transfer it into 1000mL capacity. Dilute to the mark with water and mix well. 1 mL of this solution contained 100 μg of hydrazine. 2.2.10 铯Standard storage solution. accurately weigh 0.1267g of cerium chloride, dissolve it in a small amount of water, and transfer it to a 1000mL volumetric flask. Release to the scale and mix. 1 mL of this solution contained 100 μg of hydrazine. 2.2.11 Mixed standard solution. separately remove 10.00mL of standard storage solution of arsenic and mercury (2.2.7~2.2.8) in a 100mL volumetric flask. Add 10 mL of nitric acid (2.2.2), dilute to the mark with water, and mix. 1 mL of this solution contained 10 μg of arsenic and mercury, respectively. 2.2.12 Mixed internal standard solution. Transfer 10.00mL of each standard solution of 铋 and 铯 (2.2.9~2.2.10) to 100mL volumetric flask Add 10 mL of nitric acid (2.2.2), dilute to the mark with water, and mix. 1mL of this solution contains 10μg of strontium and strontium, respectively, and then dilute the solution. Released to 1 mL of 1 μg of hydrazine and hydrazine standard solution. 2.2.13 Argon [φ(Ar) ≥ 99.999%]. ......

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