GB/T 42645-2023Gems testing—Ultraviolet-visible absorbtion spectroscopy (English PDF)
珠宝玉石鉴定 紫外-可见吸收光谱法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
May 23, 2023
Implementation date
December 1, 2023
Scope
GB/T 42645-2023 is the English-translated version of 珠宝玉石鉴定 紫外-可见吸收光谱法.
This document describes the testing of gems by ultraviolet-visible absorption spectroscopy: the principle of the method, the equipment, the samples, the test procedure, the analysis of the spectrum and the presentation of the results.
The document applies to the identification of gems and jades that show characteristic absorption by this means.
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Document preview — GB/T 42645-2023
National Standard of the People's Republic of China
- ICS
- 39.060
- Classification
- D 59
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Preface
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Method principle
- 5 Instruments and equipment
- 5.1 Instrument
- 5.2 Instrument Composition
- 5.3 Instrument working conditions
- 5.4 Instrument Performance Verification
- 6 sample
- 6.1 Sample requirements
- 6.2 Preparation before the test
- 7 Test Step
- 7.1 Boot
- 7.2 Select test method
- 7.3 Setting test parameters
- 7.4 Subtracting background
- 7.5 Sample test
- 7.6 Spectrum recording and analysis
- 8 UV-visible absorption spectrum analysis
- 8.1 Reference Spectroscopy
- 8.2 Characteristic absorption peak method
- 8.3 Precautions
- 9 results show
- Appendix A (Informative) Verification of UV-Vis spectrometer A 1 Technical requirements
- Appendix B (Informative) UV-Vis Absorption Spectra of Jewelry and Jade Varieties Figure B 1 Explanation on the Collection of Maps
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 for Standardization Documents" drafting.
1 Scope
This document describes the method principle, equipment, samples, test procedures, light Spectral analysis and presentation of results.
This document is applicable to the identification of jewelry and jade with characteristic absorption by means of ultraviolet-visible absorption spectroscopy.
2 Normative references
The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, 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 8322 Terminology of Molecular Absorption Spectroscopy
GB/T 13966 Terminology for Analytical Instruments
GB/T 16552 Names of Jewelry and Jade
GB/T 16553 Identification of Jewelry and Jade
3 Terms and Definitions
GB/T 16552, GB/T 16553, GB/T 13966, GB/T 8322 and the following terms and definitions apply to this document.
3.1 Ultraviolet-visible absorption spectrum
Under the radiation of electromagnetic waves in the ultraviolet-visible band, the valence electrons of the internal particles (atoms, ions or molecules) of jewelry and jade have a specific wavelength.
Light (energy) is selectively absorbed and transitions between corresponding electronic energy levels to form a spectrum.
3.2 Color center
The selective absorption of ultraviolet-visible light in jewelry and jade makes the crystal lattice defects of jewelry and jade show color.
3.3 Chromophoreelement
Various chemical elements that cause the color of jewelry jade.
Note: mainly transition metal elements (ions), and secondly rare earth and radioactive elements.
3.4 Integrating sphere
A hollow spherical shell whose inner wall is coated with white diffuse reflection material, and each point of the inner wall has uniform diffuse reflection.
3.5 Diffuse reflectance method
It is a method to obtain the ultraviolet-visible absorption spectrum of the sample by using the integrating sphere accessory to receive the diffuse reflection light signal of the sample.
3.6 Absorbance
The base 10 logarithm of the ratio of incident light intensity to transmitted light intensity can be expressed in A.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 55 pages — is available in the English PDF.
Referenced standards
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Related Standards
GB/T 13966-2013 — Terminology for analytical instruments
GB/T 16552-2017 — Gems - Nomenclature
GB/T 16553-2017 — Gems - Testing
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