GB/T 18043-2013: Jewellery -- Determination of precious metal content -- Method using X-ray fluorescence spectrometry

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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.
3.2
Working reference materials
A kind of material or substance that has the adequate uniformity and the
well-determined properties. It is used to calibrate the measurement device,
evaluate the measurement method, or assign the value to materials. Under the
condition of without the national certified reference materials and national
standard samples, it is the reference material that is prepared by the laboratory
independently, and of which the property value is traceable.
— Content of precious metal;
— Uniformity degree of the tested sample (including segregation, welding
agent, etc.).
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). Determine the measurement results’ range in accordance
with the evaluation results (the measurement results ± measurement uncertainty).
Along with the decreasing of the main-content of the precious metal, the range of
the measurement results will increase.
8.2 According to the range of measurement results, conduct the screening and
determining.
a) Conformity. The lower limit of the range of measurement results is greater
than or equal to the low limit of the nominal value.
b) Inconformity. The upper limit of the range of measurement results is less
than the low limit of the nominal value. But this Standard cannot be used
alone as the basis of determination of inconformity.
c) Unable to determine. The range of measurement results includes the low
limit of the nominal value. The method in the Annex C can be chosen to
conduct sample treatment and result calculations. And further analysis for
the sample can also be conducted in accordance with the arbitration
method as stipulated in GB 11887.
8.3 The determination results can provide the testing qualitative conclusion. Or it
can provide the corresponding purity range according to GB 11887.

Basic Data

Standard ID	GB/T 18043-2013 (GB/T18043-2013)
Description (Translated English)	Jewellery -- Determination of precious metal content -- Method using X-ray fluorescence spectrometry
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	Y88
Classification of International Standard	39.060
Word Count Estimation	16,127
Older Standard (superseded by this standard)	GB/T 18043-2008
Quoted Standard	GB 11887
Regulation (derived from)	National Standards Bulletin No. 25 of 2013
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	The standard provides: Application of X-ray fluorescence spectrometry jewelry precious metal content methods and requirements. This standard applies to: jewelry and other crafts Qualitative analysis and in Precious metals (gold, silver, platinum, palladiu