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GB/T 12690.11-2025: Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Part 11: Determination of magnesium content - Flame atomic absorption spectrometric method
Status: Valid GB/T 12690.11: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 12690.11-2025 | English | 219 |
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Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Part 11: Determination of magnesium content - Flame atomic absorption spectrometric method
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GB/T 12690.11-2025
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| GB/T 12690.11-2003 | English | 189 |
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Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides -- Determination of magnesium content -- Flame atomic absorption spectrometric method
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GB/T 12690.11-2003
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| GB/T 12690.11-1990 | English | 199 |
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Terbium oxide--Determination of lanthanum oxide, cerium oxide, praseodymium oxide, neodymium oxide, samarium oxide, europium oxide, gadolinium oxide, dysprosium oxide, holmium oxide, erbium oxide and yttrium oxide contents--Emission spectrogra
| Obsolete |
GB/T 12690.11-1990
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Basic data | Standard ID | GB/T 12690.11-2025 (GB/T12690.11-2025) | | Description (Translated English) | Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Part 11: Determination of magnesium content - Flame atomic absorption spectrometric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H14 | | Classification of International Standard | 77.120.99 | | Word Count Estimation | 10,174 | | Date of Issue | 2025-08-01 | | Date of Implementation | 2026-02-01 | | Older Standard (superseded by this standard) | GB/T 12690.11-2003 | | Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China | GB/T 12690.11-2025: Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides - Part 11: Determination of magnesium content - Flame atomic absorption spectrometric method
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National Standard of the People's Republic of China
ICS 77.120.99CCS H 14
Non-rare earth impurities in rare earth metals and their oxides
Chemical analysis methods - Part 11.Determination of magnesium content
Flame atomic absorption spectrometry
Chemical analysis methods for non⁃rare earth impurities of rare earth metals
and their oxides-Part 11.Determination of magnesium content-
Flame atomic absorption spectrometric method
Released on August 1, 2025
2026-02-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Replaces GB/T 12690.11-2003
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting is required.
This document is Part 11 of GB/T 12690 "Chemical analysis of non-rare earth impurities in rare earth metals and their oxides".
The following parts have been published.
-- Part 1.Determination of carbon and sulfur content - High-frequency infrared absorption method;
-- Part 2.Determination of loss on ignition of rare earth oxides - Gravimetric method;
-- Part 3.Determination of water content in rare earth oxides - Gravimetric method;
-- Part 4.Determination of oxygen and nitrogen content - 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 and 1,10-phenanthroline spectrophotometric method;
--Part 7.Determination of silicon content;
--Part 8.Determination of sodium content;
-- Part 9.Determination of chloride content - Silver nitrate turbidimetric method;
-- Part 10.Determination of phosphorus content - Molybdenum blue spectrophotometric method;
-- Part 11.Determination of magnesium content - Flame atomic absorption spectrometry;
-- Part 12.Determination of thorium and uranium content - Inductively coupled plasma mass spectrometry;
-- Part 13.Determination of molybdenum and tungsten content - Inductively coupled plasma spectrometry and inductively coupled plasma mass spectrometry;
-- Part 14.Determination of titanium content;
--Part 15.Determination of calcium content;
-- Part 16.Determination of fluoride content - Ion selective electrode method;
-- Part 17.Determination of niobium and tantalum in rare earth metals;
-- Part 18.Determination of zirconium content;
-- Part 19.Determination of arsenic and mercury content;
-- Part 20.Determination of trace amounts of fluorine and chlorine in rare earth oxides - Ion chromatography;
-- Part 21.Determination of sulfate content in rare earth oxides—Barium sulfate turbidimetric method.
This document replaces GB/T 12690.11-2003 "Chemical analysis of non-rare earth impurities in rare earth metals and their oxides - Determination of magnesium content"
Compared with GB/T 12690.11-2003, the main technical changes are as follows, except for the structural adjustment and editorial changes.
The following.
a) Added magnesium standard solution A (see 5.5);
b) The concentration of magnesium standard solution B has been changed (see 5.6, 3.5 of the.2003 edition);
c) The sample pretreatment conditions have been changed (see Chapter 7, 5.1 of the.2003 edition);
d) The sample amount and constant volume of the measured elements have been changed (see 8.1, 6.1 of the.2003 edition);
e) Added the standard curve method (see 8.4.2.2);
f) “Precision” was changed and “allowable deviation” was changed to “reproducibility” (see 10.3, 8.2 of the.2003 edition);
g) Quality assurance and control (see Chapter 9 of the.2003 edition) has been deleted;
h) The instrument operating conditions (see Appendix A of the.2003 edition) have been deleted.
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed and coordinated by the National Rare Earth Standardization Technical Committee (SAC/TC 229).
This document was drafted by. Jiangyin Jiahua New Materials Resources Co., Ltd., China Rare Earth (Liangshan) Co., Ltd., Jiangxi Tungsten and Rare Earth Products Co., Ltd.
Quality Supervision and Inspection Center (Jiangxi Tungsten and Rare Earth Research Institute), Dingnan Dahua New Materials Resources Co., Ltd., Guorui Kechuang Rare Earth Functional Materials
(Ganzhou) Co., Ltd., Baotou Sanlong Rare Metal Materials Co., Ltd., and Baotou Hongbote Technology Co., Ltd.
The main drafters of this document are. Xie Jianwei, Jiang Haibo, Yao Jingbi, Fan Chengmei, Ji Qixia, Xu Na, Kang Yaxian, Zeng Qingping, Miao Fengmei, Wang Weisheng,
Wang Hao, Lü Nannan, and Yang Dawei.
This document was first published in.1990 as GB/T 12690.25-1990 “Chemical analysis of rare earth metals and their oxides by flame immersion”.
Determination of magnesium content by atomic absorption spectrometry”, which was first revised in.2003 as GB/T 12690.11-2003 “Non-rare earth metals and their oxides”
Chemical Analysis Methods for Soil Impurities - Determination of Magnesium Content - Flame Atomic Absorption Spectrometry. This is the second revision.
introduction
In the field of chemical composition analysis of rare earth products, my country has established a relatively large number of detection systems for the total amount of rare earths, non-rare earth impurities, and rare earth impurities.
GB/T 12690 "Chemical analysis of non-rare earth impurities in rare earth metals and their oxides" is based on the original standard GB/T 12690
Based on the Chemical Analysis Methods of Rare Earth Metals and Their Oxides, GB/T 8762.3-1988 Chemical Analysis Methods of Acid-soluble Dioxide in Fluorescent Grade Yttrium Oxide was incorporated.
Determination of silicon oxide content using molybdenum blue spectrophotometry" and GB/T 8762.4-1988 "Iron oxide, lead oxide, nickel oxide and oxygen in fluorescent grade yttrium oxide"
GB/T 8762.6-1988 "Determination of the content of lead oxide, nickel oxide, iron oxide and copper oxide in fluorescent grade europium oxide"
The determination of the chemical analysis method of samarium oxide by emission spectrometry" and GB/T 11074 "Chemical analysis method of samarium oxide" have formed a comprehensive analysis of the chemical analysis of all rare earth metals and their oxides.
Comprehensive analysis standard for non-rare earth impurities. The integrated series of method standards references advanced detection methods and basically covers all rare earth impurities.
The matrix of rare earth metals and their rare earth oxides provides a fast and accurate method for the determination of non-rare earth impurities in rare earth metals and their oxides.
Method, with good operability.
GB/T 12690 consists of 21 parts, depending on the test objects, test methods, and the differences between rare earth metals and rare earth oxide matrices.
Partial composition.
-- Part 1.Determination of carbon and sulfur content - High-frequency infrared absorption method;
-- Part 2.Determination of loss on ignition of rare earth oxides - Gravimetric method;
-- Part 3.Determination of water content in rare earth oxides - Gravimetric method;
-- Part 4.Determination of oxygen and nitrogen content - 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 and 1,10-phenanthroline spectrophotometric method;
--Part 7.Determination of silicon content;
--Part 8.Determination of sodium content;
-- Part 9.Determination of chloride content - Silver nitrate turbidimetric method;
-- Part 10.Determination of phosphorus content - Molybdenum blue spectrophotometric method;
-- Part 11.Determination of magnesium content - Flame atomic absorption spectrometry;
-- Part 12.Determination of thorium and uranium content - Inductively coupled plasma mass spectrometry;
-- Part 13.Determination of molybdenum and tungsten content - Inductively coupled plasma spectrometry and inductively coupled plasma mass spectrometry;
-- Part 14.Determination of titanium content;
--Part 15.Determination of calcium content;
-- Part 16.Determination of fluoride content - Ion selective electrode method;
-- Part 17.Determination of niobium and tantalum in rare earth metals;
-- Part 18.Determination of zirconium content;
-- Part 19.Determination of arsenic and mercury content;
-- Part 20.Determination of trace amounts of fluorine and chlorine in rare earth oxides - Ion chromatography;
-- Part 21.Determination of sulfate content in rare earth oxides—Barium sulfate turbidimetric method.
The above standards are established in accordance with the conventional detection elements in the production and trade of rare earth metals and their oxides. Each part includes a
One or more detection methods, respectively clarify the scope of application, selection of reagent materials and test equipment, standardize the test steps, and
The laboratory has conducted multiple tests and verifications to provide precision data, establishing a rigorous and standardized work process for the quality inspection of rare earth metals and their oxides.
Base.
Non-rare earth impurities in rare earth metals and their oxides
Chemical analysis methods - Part 11.Determination of magnesium content
Flame atomic absorption spectrometry
1 Scope
This document describes a method for the determination of magnesium in rare earth metals and their oxides by flame atomic absorption spectrometry.
This document is applicable to the determination of magnesium content in rare earth metals and their oxides. The measurement range (mass fraction) is. 0.000 5%~0.30%.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 6379.2 Accuracy (Trueness and Precision) of Measurement Methods and Results Part 2.Determination of Repeatability of Standard Measurement Methods
Basic methods of sex and reproducibility
GB/T 6682 Specifications and test methods for water used in analytical laboratories
GB/T 8170 Rules for rounding off values and expression and determination of limit values
JJG 694 Atomic Absorption Spectrophotometer
3 Terms and Definitions
There are no terms or definitions that require definition in this document.
4 Principles
The sample is dissolved in hydrochloric acid or nitric acid and measured in a dilute acid medium using an air-acetylene flame at a wavelength of 285.2 nm using an atomic absorption spectrometer.
Measure the absorbance of magnesium and calculate the magnesium content using the standard addition method or standard curve method.
5 Reagents or materials
Unless otherwise specified, only reagents of confirmed premium grade or higher and water of grade II or higher that conform to GB/T 6682 were used in the analysis.
Use distilled water or water of equivalent purity. Certified standard solutions are preferred as liquids.
5.1 Hydrogen peroxide [w (H2O2) ≥ 30%].
5.2 Hydrochloric acid (1 1).
5.3 Nitric acid (1 1).
5.4 Magnesium standard stock solution. weigh 0.4146 g of magnesium oxide (w (MgO) ≥ 99.95%) calcined at 800 °C to constant weight and add to 100 mL of calcined
Add 10 mL of water and 10 mL of hydrochloric acid (5.2) to the cup and heat to dissolve. Boil to remove all carbon dioxide, cool to room temperature, and transfer to a 500 mL volumetric flask.
Dilute to volume with water and mix thoroughly. 1 mL of this solution contains 500 μg of magnesium.
5.5 Magnesium standard solution A. Pipette 5.00 mL of magnesium standard stock solution (5.4) into a 500 mL volumetric flask, dilute to the mark with water, and mix thoroughly.
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