GB/T 20931.12-2025 PDF English
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Methods for chemical analysis of lithium - Part 12: Determination of impurity element contents - Inductively coupled plasma atomic emission spectrometry
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GB/T 20931.12-2025: Methods for chemical analysis of lithium - Part 12: Determination of impurity element contents - Inductively coupled plasma atomic emission spectrometry
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT20931.12-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.120.99
CCS H 14
Methods for Chemical Analysis of Lithium – Part 12.
Determination of Impurity Element Contents – Inductively
Coupled Plasma Atomic Emission Spectrometry
Issued on: FEBRUARY 28, 2025
Implemented on: SEPTEMBER 1, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
Introduction... 5
1 Scope... 7
2 Normative References... 7
3 Terms and Definitions... 8
4 Principle... 8
5 Reagents or Materials... 8
6 Instruments and Equipment... 8
7 Samples... 9
8 Test Procedures... 9
9 Test Data Processing... 10
10 Precision... 11
11 Test Report... 12
Appendix A (Informative) Recommended Analysis Spectrum Lines and Instrument
Reference Working Parameters... 14
Appendix B (Informative) Statistical Data Obtained from Laboratory Results... 15
Foreword
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for
Standardization – Part 1.Rules for the Structure and Drafting of Standardizing Documents.
This Document is Part 12 of GB/T 20931 Methods for Chemical Analysis of Lithium. GB/T
20931 has published the following parts.
--- Determination of potassium content - Flame atomic absorption spectrometric method;
--- Determination of sodium content - Flame atomic absorption spectrometric method;
--- Determination of calcium content - Flame atomic absorption spectrometric method;
--- Determination of iron content - Orthopenanthroline spectrophotometric method;
--- Determination of silicon content - Molybdenum blue spectrophotometric method;
--- Determination of aluminum content – Chrome azurol S-cetylpyridinium bromide
spectrophotometric method;
--- Determination of nickel content - α-Furil dioxime spectrophotometric method;
--- Determination of chlorine content - Thiocyanate spectrophotometric method;
--- Determination of nitrogen content - Mercuric potassium iodide spectrophotometric
method;
--- Determination of copper content - Flame atomic absorption spectrometric method;
--- Determination of magnesium content - Flame atomic absorption spectrometric method;
--- Part 12.Determination of impurity element contents - Inductively coupled plasma atomic
emission spectrometry.
Please note some contents of this Document may involve patents. The issuing agency of this
Document shall not assume the responsibility to identify these patents.
This Document was proposed by China Nonferrous Metals Industry Association.
This Document shall be under the jurisdiction of National Technical Committee on Nonferrous
Metals of Standardization Administration of China (SAC/TC 243).
Drafting organizations of this Document. Jiangxi Ganfeng Lithium Group Co., Ltd.; Chongqing
Tianqi Lithium Co., Ltd.; Xinjiang Nonferrous Metals Research Institute Co., Ltd.; Urumqi
Asia-Europe Rare Metals Co., Ltd.; Agilent Technology (China) Co., Ltd.; Ganfeng Lithium
Co., Ltd.; Guangdong Academy of Sciences Industrial Analysis and Testing Center; Guobiao
Methods for Chemical Analysis of Lithium – Part 12.
Determination of Impurity Element Contents – Inductively
Coupled Plasma Atomic Emission Spectrometry
1 Scope
This Document specifies the method for determining the content of impurity elements such as
aluminum, calcium, copper, iron, potassium, magnesium, sodium, nickel, lead, and silicon in
metallic lithium by inductively coupled plasma atomic emission spectrometry.
This Document is applicable to the determination of the content of impurity elements such as
aluminum, calcium, copper, iron, potassium, magnesium, sodium, nickel, lead, and silicon in
industrial-grade metallic lithium and battery-grade metallic lithium. The determination range is
shown in Table 1.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 8170 Rules of rounding off for numerical values & expression and judgement of
limiting values
JJG 768 Verification Regulation of Emission Spectrometer
3 Terms and Definitions
For the purposes of this Document, there are no terms and definitions that need to be defined.
4 Principle
The test material is dissolved in water. In the hydrochloric acid medium, the matrix matching
standard curve method is used to determine the content of impurity elements such as aluminum,
calcium, copper, iron, potassium, magnesium, sodium, nickel, lead and silicon in metal lithium
using the inductively coupled plasma atomic emission spectrometer.
5 Reagents or Materials
Unless otherwise stated, only reagents that are confirmed to be guaranteed reagents are used in
the analysis.
5.1 Water, GB/T 6682, Grade-1.
5.2 High-purity lithium carbonate (with mass fraction of no less than 99.999%).
5.3 Hydrochloric acid (1+1).
5.4 P-nitrophenol indicator (1 g/L).
5.5 Standard storage solution of aluminum, calcium, copper, iron, potassium, magnesium,
sodium, nickel, lead, silicon (1,000 μg/mL). Standard storage solutions can be purchased with
certified standard substances or standard samples.
5.6 Mixed standard solution A. Respectively transfer 10.00 mL of each standard storage
solution (5.5) into a 200 mL volumetric flask; dilute it with water to the scale; and mix well. 1
mL of this solution contains 50.00 μg of each measured element. If the silicon standard storage
solution is sodium hydroxide or other alkaline matrix, the silicon standard solution must be
prepared separately.
5.7 Mixed standard solution B. Respectively transfer 2.00 mL of each standard storage solution
(5.5) into a 200 mL volumetric flask; dilute it with water to the scale; and mix well. 1 mL of
this solution contains 10.00 μg of each measured element. If the silicon standard storage
solution is sodium hydroxide or other alkaline matrix, the silicon standard solution must be
prepared separately.
6 Instruments and Equipment
6.1 Inductively coupled plasma atomic emission spectrometer. The equipment performance
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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