GB/T 18043-2013 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 18043-2013 | English | 130 |
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Jewellery -- Determination of precious metal content -- Method using X-ray fluorescence spectrometry
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| GB/T 18043-2008 | English | 199 |
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Jewellery -- Determination of precious metal content -- Method using X-ray fluorescence spectrometry
| Obsolete |
| GB/T 18043-2000 | English | 199 |
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Precious metal jewellery content non-damaged test method X-ray fluorescence spectrometry
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GB/T 18043-2013: Jewellery -- Determination of precious metal content -- Method using X-ray fluorescence 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/GBT18043-2013
GB18043‐2013
Wayne Zheng et al.
GB
ICS 39.060
Y 88
NATIONAL STANDARD
GB/T 18043-2013
Replacing GB/T 18043-2008
Jewellery — Determination of precious metal content
— Method using X-Ray fluorescence spectrometry
Issued on. DECEMBER 17, 2013
Implemented on. MARCH 1, 2014
Issued by. General Administration of Quality Supervision, Testing and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword... 3
Introduction... 5
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 6
4 Method and principle... 7
5 Instruments and equipment... 7
6 Test method... 7
7 Factors that affect the measurement results... 8
8 Processing of measurement results... 9
9 Limitations... 9
Annex A... 11
Annex B... 12
Annex C... 20
Foreword
This Standard was drafted according to the rules specified in GB/T 1.1-2009.
This Standard replaces the GB/T18043-2008 Jewellery - Determination of Precious
Metal Content - Method Using X-Ray Fluorescence Spectrometry. There are mainly
the following changes, compared with the GB/T 18043-2008.
— Revise the application scope. Clearly define this test method as the screening
test;
— Add the terms;
— In detail, describe the basic principles of X-ray fluorescence spectrometry.
Clearly state the application scope of this method in terms of working principles;
— Improve the resolution requirements of this method TO X-ray fluorescence
spectrometer;
— Refine the test process. Clarify the operation steps of this method;
— Add the content description and illustration for screening and determination in
accordance with measurement result’s range.
— Add the description of limitations of the method;
— Add Annex A, B and C.
This Standard was proposed by China National Light Industry Council.
This Standard shall be under the jurisdiction of National Technical Committee
(SAC/TC 256) on Jewellery of Standardization Administration of China.
Drafting organizations of this Standard. National Gold and Silver Products Quality
Supervision and Testing Center (Nanjing), National Jewellery Quality Supervision and
Inspection Center, China Institute of Metrology, National Gemstone Quality
Supervision and Testing Center, National Gold and Silver Products Quality
Supervision and Testing Center (Shanghai), National Gold Diamond Products Quality
Supervision and Testing Center, Tianjin Product Quality Supervision and Testing
Technology Research Institute, and Chengdu Product Quality Supervision and Testing
Institute.
The main drafters of this Standard. Yang Pei, Yang Su, Zhou Tao, Duan Tiyu, Li
Suqing Ke Jie, Xie Qiyao, Cheng Youfa, Cao Weiyu, Shen Feng, Wang Donghui,
Shen Meidong, Fang Mingshu, Liu Huafeng, Wang Chunsheng, Li Yukun, Li Guogui,
and Li Wujun.
The previous editions replaced by this Standard are as follows.
— GB/T 18043-2000, GB/T 18043-2008.
Introduction
The test laboratory that uses this Standard is required to develop implementation
details such as - personnel, facilities and environmental conditions, equipment
(including working reference materials), and uncertainty evaluation.
During use of this Standard, it is necessary to refer to Annex A, Annex B, and
Annex C to perform sample testing, data processing, and result determination.
Jewellery — Determination of precious metal content
— Method using X-Ray fluorescence spectrometry
1 Scope
This Standard specifies the methods and requirements for applying X-ray
fluorescence spectrometry to determine the precious metal content in jewellery.
This Standard applies to qualitative analysis for jewellery and other art-wares. And
it also applies to the screening test of precious metal content (gold, silver, platinum,
and palladium) in jewellery and other art-wares.
2 Normative references
The articles contained in the following documents have become part of this
document when they are quoted herein. For the dated documents so quoted, all
the modifications (Including all corrections) or revisions made thereafter shall be
applicable to this document.
GB 11887 Jewellery - Fineness of precious metal alloys and designation
3 Terms and definitions
For the purpose of this document, the following terms and definitions shall apply.
3.1
Screening
A kind of analysis method that preliminarily quantifies the element’s content in the
substance to be tested.
4 Method and principle
Through X-ray excitation (penetration thickness is typically a few microns to tens
of microns), the elements on surface layer of jewellery can emit characteristic
X-ray fluorescence spectrum. Perform the qualitative analysis according to the
characteristic spectrum lines (energy or wavelength).
5 Instruments and equipment
5.1 X-ray fluorescence spectrometer. Peak of manganese at 5.89 keV energy
position - its resolution is better than 170 eV.
6 Test method
6.1 Instrument calibration
Calibration shall be conducted periodically in accordance with the specific
requirements for instruments.
6.2 Test conditions
6.3 Test method
6.3.1 Check sample varieties, imprinting, appearance and other properties.
6.3.2 Conduct qualitative analysis to determine the composition of principal
elements and impurity elements.
6.3.3 According to the results of qualitative analysis, select the reference
materials whose purity level basically matches with the impurity components’.
Each reference materials shall be measured for three times at least. Obtain the
average value after repeated measurements. Use the standard values and the
corresponding average values of each element’s content AS the parameters.
Draw the correction curves. Obtain the linear equation of the correction curve.
7 Factors that affect the measurement results
Due to the special condition of the jewellery products, and under the restriction of
the method and principle, when using this Method, the testing personnel shall
understand and be familiar with the following factors that will affect the
measurement results (such affecting factors may have a significant influence on
the collection of the characteristic spectral line’s intensity under the different
conditions. It may even cause the erroneous judgment).
8 Processing of measurement results
8.1 Considering the various factors in Chapter 7, the testing laboratory shall
evaluate the uncertainty on the measurement results (the evaluation method shall
reference to Annex B).
8.2 According to the range of measurement results, conduct the screening and
determining.
8.3 The determination results can provide the testing qualitative conclusion. Or it
can provide the corresponding purity range according to GB 11887.
9 Limitations
9.1 Because there are differences on the aspects of component, shape etc.
between reference materials and the tested sample, the range of test elements is
uncertain.
9.2 If there is dispute of the testing result, it shall be tested in accordance with the
arbitration method as stipulated in GB 11887.
9.3 For the samples containing solder and of which the nominal value of the
precious metal purity is 999‰, the measured value shall consider the solder’s
proportion in sample. Weighted calculation shall be conducted when calculating
the specific measurement results.
Annex A
(Informative) Testing flow chart for determination of precious metal content using X-ray fluorescence spectrometry
Test process of determining the precious metals content is shown in Figure A.1.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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