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Method for identifying true and false precious metal ornaments

A precious metal and jewelry technology, applied in the field of authentic and false identification of precious metal jewelry, can solve problems such as misjudgment, low identification accuracy, damage to precious metal jewelry, etc., to achieve the effect of achieving accuracy and simplifying processing procedures

Inactive Publication Date: 2015-02-04
NINGBO ACAD OF SCI & TECH FOR INSPECTION & QUARANTINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fire test gold method and the chemical analysis method need to destroy the precious metal ornaments during detection, and the detection takes a long time; the X-ray penetration depth in the X-ray fluorescence spectroscopic analysis method is limited, and the electron beam scanning depth in the electron probe analysis method is limited. For counterfeit precious metal jewelry with cladding or too thick plating, there will be misjudgment, and the identification accuracy is not high

Method used

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  • Method for identifying true and false precious metal ornaments
  • Method for identifying true and false precious metal ornaments
  • Method for identifying true and false precious metal ornaments

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: A method for identifying the authenticity of a precious metal ornament, the precious metal ornament is identified as a silver bracelet, comprising the following steps:

[0024] ① Turn on the inductively coupled plasma mass spectrometer, wait for the instrument to complete initialization, and set the working conditions of the inductively coupled plasma mass spectrometer according to the instrument manual: the working gas is argon, the purity is 99.996%, the air pressure is 0.70MPa, and the plasma gas flow rate is 15.0L / min, the auxiliary gas flow rate is 1.0L / min, the carrier gas flow rate is 1.3L / min, the data acquisition mode adopts the time resolution mode of peak jumping, the acquisition time is 120s, and the elements to be analyzed are set as Cr, Fe, Co, Ni, Cu, Zn, As, Se, Zr, Rh, Pd, Ag, Cd, Sn, Sb, Te, Pt, Au, Hg, Pb, Bi, etc., selected in inductively coupled plasma mass spectrometer 53 Cr, 56 Fe, 59 Co. 60 Ni, 63 Cu, 66 Zn, 75 As, 77 Se, 90...

Embodiment 2

[0028] Embodiment 2: A method for identifying the authenticity of a precious metal ornament, the precious metal ornament is identified as a pure gold pendant, comprising the following steps:

[0029] ① Turn on the inductively coupled plasma mass spectrometer, wait for the instrument to complete initialization, and set the working conditions of the inductively coupled plasma mass spectrometer according to the instrument manual: the working gas is argon, the purity is 99.996%, the air pressure is 0.70MPa, and the plasma gas flow rate is 15.0L / min, the auxiliary gas flow rate is 1.0L / min, the carrier gas flow rate is 1.3L / min, the data acquisition mode adopts the time resolution mode of peak jumping, the acquisition time is 120s, and the elements analyzed are Cr, Fe, Co , Ni, Cu, Zn, As, Se, Zr, Rh, Pd, Ag, Cd, Sn, Sb, Te, Pt, Au, Hg, Pb, Bi, etc., selected in the inductively coupled plasma mass spectrometer 53 Cr, 57 Fe, 59 Co. 60 Ni, 63 Cu, 66 Zn, 75 As, 77Se, 90 Zr, 1...

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Abstract

The invention discloses a method for identifying true and false precious metal ornaments. Appropriate laser pulse energy and defocusing distance are selected according to the material and thickness of a sample; precious metal ornaments are corroded by pulse laser in single points; the primary treatment procedure of the sample is simplified; the corroded material of the metal ornaments is detected by using an inductively coupled plasma source mass spectrometer; a time-resolved figure of an isotope is detected by collecting respective elements; the true and false precious metal ornaments can be known by analyzing the time-solved figure; and the purity of the precious metal can be accurately obtained by standardless analysis. The method has the advantages that the time required for the overall corrosion and signal collection processes is 1-2 minutes; the detection speed is high; in addition, the laser strength is not reduced due to increase of corrosion depth; misjudgment due to the fact that the sample cannot be fully corroded due to over-thickness is avoided; the method is not limited by coating or plating thickness; the identification accuracy is high; the corrosion diameter is 30-80 microns; and the appearance of a solid sample is in a good shape at the macro level.

Description

technical field [0001] The invention relates to a technology for identifying metal ornaments, in particular to a method for identifying genuine and fake precious metal ornaments. Background technique [0002] In recent years, with the improvement of people's living standards, the jewelry market has developed rapidly, and the demand for gold, silver and other precious metal jewelry has increased significantly. However, in the active precious metal trading market, all kinds of counterfeit gold, silver and other precious metal jewelry have also begun to flood, seriously disrupting the order of the precious metal jewelry market and damaging the rights and interests of consumers. [0003] Existing methods for identifying the authenticity of precious metal ornaments mainly include the following: fire assay, chemical analysis, X-ray fluorescence spectroscopic analysis and electronic probe analysis. However, the fire test gold method and the chemical analysis method need to destroy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/64
Inventor 金献忠谢健梅林力陈建国
Owner NINGBO ACAD OF SCI & TECH FOR INSPECTION & QUARANTINE
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