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GB/T 12690.8-2021: Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Part 8: Determination of sodium content
Status: Valid GB/T 12690.8: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 12690.8-2021 | English | 269 |
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Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Part 8: Determination of sodium content
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GB/T 12690.8-2021
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| GB/T 12690.8-2003 | English | 279 |
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Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides -- Determination of sodium content -- Flame atomic absorption spectrometric method
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GB/T 12690.8-2003
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| GB/T 12690.8-1990 | English | 199 |
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Neodymium and neodymium oxide--Determination of lanthanum oxide, cerium oxide, praseodymium oxide, samarium oxide and yttrium oxide contents--Emission spectrographic method
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GB/T 12690.8-1990
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PDF similar to GB/T 12690.8-2021
Basic data | Standard ID | GB/T 12690.8-2021 (GB/T12690.8-2021) | | Description (Translated English) | Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Part 8: Determination of sodium content | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H14 | | Word Count Estimation | 14,124 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 12690.8-2021: Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Part 8: Determination of sodium content
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Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Part 8.Determination of sodium content
ICS 77.120.99
CCSH14
National Standards of People's Republic of China
Replace GB/T 12690.8-2003
Non-rare earth impurities in rare earth metals and their oxides
Chemical analysis method
Part 8.Determination of the amount of sodium
Released on 2021-10-11
2022-05-01 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents"
Drafting.
This document is part 8 of GB/T 12690 "Chemical Analysis Methods of Non-rare Earth Impurities in Rare Earth Metals and Their Oxides". GB/T 12690
The following parts have been released.
---Part 1.Determination of Carbon and Sulfur Content High Frequency-Infrared Absorption Method;
---Part 2.Gravimetric method for determination of ignition loss in rare earth oxides;
---Part 3.Gravimetric method for the determination of water content in rare earth oxides;
---Part 4.Determination of oxygen and nitrogen content by pulse-infrared absorption method and pulse-thermal conductivity method;
---Part 5.Determination of cobalt, manganese, lead, nickel, copper, zinc, aluminum, chromium, magnesium, cadmium, vanadium and iron content;
---Part 6.Determination of iron content potassium thiocyanate, 1,10-phenanthroline spectrophotometry;
---Part 7.Determination of silicon content;
---Part 8.Determination of sodium content;
---Part 9.Determination of Chlorine Content Silver Nitrate Turbidimetric Method;
---Part 10.Determination of phosphorus content molybdenum blue spectrophotometry;
---Part 11.Determination of Magnesium Content Flame Atomic Absorption Spectrometry;
---Part 12.Determination of Thorium Content Arsenazo Ⅲ Spectrophotometry and Inductively Coupled Plasma Mass Spectrometry;
---Part 13.Determination of molybdenum and tungsten content inductively coupled plasma emission spectrometry and inductively coupled plasma mass spectrometry;
---Part 14.Determination of the amount of titanium;
---Part 15.Determination of calcium content;
---Part 16.Determination of fluorine content by ion selective electrode method;
---Part 17.Determination of the amount of niobium and tantalum in rare earth metals;
---Part 18.Determination of the amount of zirconium;
---Part 19.Determination of arsenic and mercury content.
This document replaces GB/T 12690.8-2003 "Methods for chemical analysis of non-rare earth impurities in rare earth metals and their oxides. Determination of sodium content
Flame Atomic Absorption Spectrometry, compared with GB/T 12690.8-2003, except for structural adjustments and editorial changes, the main technical changes
as follows.
a) The measurement range of sodium content has been changed from "0.0005%~0.025%" to the "measurement range of flame atomic absorption spectrometry".
0.0005%~0.025%; inductively coupled plasma emission spectrometry measurement range. 0.010%~0.20%; inductive coupling, etc.
The measurement range of ionomer mass spectrometry. 0.0005%~0.025%" (see Chapter 1, Chapter 1 of the.2003 edition);
b) Two chapters "Normative Reference Documents" and "Terms and Definitions" have been added (see Chapter 2 and Chapter 3);
c) Added inductively coupled plasma emission spectroscopy (see Chapter 5);
d) Inductively coupled plasma mass spectrometry has been added (see Chapter 6);
e) Changed "Precision" and changed "Allowable Difference" to "Reproducibility" (see 4.7.2,.2003 version 8.2);
f) Deleted quality assurance and control (see Chapter 9 of the.2003 edition);
g) Delete the working conditions of the instrument (see Appendix A of the.2003 edition).
Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents.
This document was proposed and managed by the National Rare Earth Standardization Technical Committee (SAC/TC229).
This document was drafted by. Guohe General Testing, Evaluation and Certification Co., Ltd., National Standard (Beijing) Inspection and Certification Co., Ltd., Leshan Rui, Sichuan Province
Feng Metallurgical Co., Ltd., Fujian Changting Jinlong Rare Earth Co., Ltd., National Tungsten and Rare Earth Product Quality Supervision and Inspection Center, Chinese Academy of Sciences
Western Research Institute Xiamen Rare Earth Materials Research Institute, Ganzhou Non-ferrous Metallurgy Research Institute, Zhejiang Geological Exploration Institute of Sinochem General Administration of Geology and Mines, Qiandong Rare Earth Collection
Group Co., Ltd., China North Rare Earth (Group) High-Tech Co., Ltd., Jiangyin Jiahua New Material Resources Co., Ltd., Ganzhou Zhanhai
New Material Technology Co., Ltd.
The main drafters of this document. Mo Shumin, Hu Mengqiao, Li Aichang, Deng Nan, Bao Yelin, Wang Changhua, Li Youyou, Wang Jinfeng, Chen Wen, Song Lijun,
Li Na, Chen Xiongfei, Xie Lu, Chen Wenmei, Wen Bin, Dong Sanli, Yao Jingbi, Luo Wei, Wang Changjiao, Wang Baohua, Wu Zhengyu, Zhang Qikai, Yang Feng, Pan Yanyun,
Wang Xianli, Lin Ying.
The previous releases of this document and the documents it replaced are as follows.
---It was first published as GB/T 12690.26-1990 in.1990 and revised as GB/T 12690.8-2003 for the first time in.2003;
---This is the second revision.
Introduction
In the field of analysis of the chemical composition of rare earth products, my country has established a test for the total amount of rare earth, non-rare earth impurities, and rare earth impurities.
It is a comprehensive standard system. This standard series GB/T 12690 "Chemical Analysis Methods for Non-rare Earth Impurities in Rare Earth Metals and Their Oxides" is based on the original
Based on the standard GB/T 12690.12~.26-1990 "Methods for Chemical Analysis of Rare Earth Metals and Their Oxides", GB/T 8762.3-
1988 "Molybdenum Blue Spectrophotometric Method for the Determination of Acid-soluble Silica in Fluorescence Grade Yttrium Oxide", GB/T 8762.4-1988 "Fluorescence Grade Yttrium Oxide
Determination of the amount of iron oxide, lead oxide, nickel oxide and copper oxide by emission spectrometry", GB/T 8762.6-1988 "Fluorescence grade europium oxide in oxidation
Determination of lead, nickel oxide, iron oxide and copper oxide content by emission spectrometry", GB/T 11074.3~.7-1989 "chemical analysis method of samarium oxide", etc.
Standards, and finally form a comprehensive analysis method standard for non-rare earth impurities in all rare earth metals and their oxides. The revised method standard cited
Using advanced detection methods, and basically covering all rare earth metals and their rare earth oxide matrix. The establishment of this series of method standards is rare
The determination of the content of non-rare earth impurities in earth metals and their oxides provides a quick and accurate method and specification, and has good operability.
This revision of this document adds inductively coupled plasma emission spectrometry (see Chapter 5) and inductively coupled plasma mass spectrometry (see Chapter 5).
Chapter 6), to ensure the advancement and applicability of the standard method, and at the same time through a number of laboratory tests and verifications, to modify the "allowable difference" clause to "reproduce
In the standard, the repeatability and re-linearity limits covering at least three points of high, medium and low are given in the standard, which makes the precision requirements of the method more
Complete.
Non-rare earth impurities in rare earth metals and their oxides
Chemical analysis method
Part 8.Determination of the amount of sodium
1 Scope
This document specifies the method for the determination of sodium content in rare earth metals and their oxides.
This document is applicable to the determination of sodium content in rare earth metals and their oxides, including flame atomic absorption spectrometry (method 1), inductive coupling
Plasma emission spectroscopy (method 2) and inductively coupled plasma mass spectrometry (method 3). Flame atomic absorption spectrometry measurement range (quality
Mass fraction). 0.0005%~0.025%; inductively coupled plasma emission spectrometry measurement range (mass fraction). 0.010%~0.20%; electricity
Inductively coupled plasma mass spectrometry measurement range (mass fraction). 0.0005% ~ 0.025%.
When the scope of analysis of the three methods in this document overlaps, method 1 is preferred as the arbitration method.
2 Normative references
The content of the following documents constitutes an indispensable clause of this document through normative references in the text. Among them, dated quotations
Only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
This document.
GB/T 8170 Numerical rounding rules and the expression and determination of limit values
3 Terms and definitions
There are no terms and definitions that need to be defined in this document.
4 Flame atomic absorption spectrometry (Method 1)
4.1 Principle of the method
The sample is dissolved in nitric acid, in a dilute nitric acid medium, using an air-acetylene flame, and measured at a wavelength of 589.0nm in an atomic absorption spectrometer
The absorbance of sodium. Use the standard addition method to calculate the sodium content.
4.2 Reagents
Unless otherwise specified, only reagents and distilled water or deionized water or equivalent purity water are used in the analysis.
4.2.1 Hydrogen peroxide (30%).
4.2.2 Nitric acid (1 1).
4.2.3 Oxalic acid (ρ=50g/L).
4.2.4 Sodium standard storage solution. Weigh 2.5421g of sodium chloride (superior grade pure) that has been burned at 400°C to 450°C until there is no cracking sound in 500mL
In the beaker, add.200mL of water to dissolve. Transfer to a 1000mL volumetric flask, dilute to the mark with water, and mix well. This solution 1mL contains 1mg sodium.
4.2.5 Sodium standard solution. Pipette 10.00mL sodium standard stock solution (4.2.4) into a 1000mL volumetric flask, dilute to the mark with water, and mix
uniform. This solution 1mL contains 10μg sodium.
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