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A method for authenticating the authenticity of precious metal jewelry
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A technology for precious metals and ornaments, which is applied in the field of authenticity identification of precious metal ornaments, which can solve problems such as misjudgment, low identification accuracy, and long detection time, and achieve the effect of simplifying the processing procedure and achieving accuracy
Inactive Publication Date: 2016-08-17
NINGBO ACAD OF SCI & TECH FOR INSPECTION & QUARANTINE
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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-raypenetration depth in the X-rayfluorescence spectroscopic analysis method is limited, and the electronbeam 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
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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 plasmamassspectrometer, wait for the instrument to complete initialization, and set the working conditions of the inductively coupled plasmamassspectrometer 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,77 Se, 90 Zr, 10...
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Abstract
The invention discloses a method for identifying true and false precious metalornaments. Appropriate laserpulse energy and defocusing distance are selected according to the material and thickness of a sample; precious metalornaments are corroded by pulse laser in single points; the primary treatment procedure of the sample is simplified; the corroded material of the metalornaments is detected by using an inductively coupled plasma source massspectrometer; 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 corrosiondiameter 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-rayfluorescence 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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Patent Type & Authority Patents(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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