Method for determining content of impurity elements in high-purity gold jewelry

Abstract

The invention provides a method for determining the content of impurity elements in a high-purity gold jewelry. According to the method, a laser denudation inductively coupled plasma mass spectrometeris adopted for measurement, and the method comprises the following steps of S1, optimizing the denudation light spots, the denudation energy and the denudation frequency parameters of a target objectmeasured by the laser denudation inductively coupled plasma mass spectrometer; S2, testing a series of gold standard samples by adopting the optimized experimental parameters, and establishing a content-signal strength standard curve of various impurity elements in the gold samples; S3, testing the signal values of the impurity elements in the to-be-tested high-purity gold jewelry sample, and obtaining the content of the impurity elements through the content-signal intensity standard curve. According to the method, the sample dissolving pretreatment is omitted, the sample damage belongs to micro-damage, the damage degree is extremely low, the introduction of external pollution sources is avoided by direct carrying out the solid test, and the method has the advantages of being environmentfriendly, real-time, micro-damage and accurate in element determination and is a new application of the laser denudation inductively coupled plasma mass spectrometer in the field of precious metal detection.

Description

technical field [0001] The invention relates to the technical field of precious metal detection, in particular to a method for measuring the content of impurity elements in high-purity gold jewelry. Background technique [0002] High-purity gold jewelry is an emerging category of precious metals. Compared with traditional gold products, it has a higher gold content (up to 999.99‰). However, the existing detection methods for impurity elements in high-purity gold jewelry rely on liquid samples after pre-treatment with aqua regia. , so as to determine the content of impurity elements. However, the inventors of the present invention have found through research that the existing detection method requires pre-treatment of sample dissolution, which has the disadvantages of time-consuming, easy to bring pollution and large loss. A simple, minimally destructive and effective detection method is sought. Contents of the invention [0003] Aiming at the technical problems that the ...

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Problems solved by technology

[0003] Aiming at the technical problems that the existing high-purity gold jewelry impurity element detection method requires sample-dissolving pre-treatment, and thus has the disadvantages of time-consuming, easy pollution and large loss, the present invention provides a method for determining the content of impurity elements in high-purity gold jewelry. In this paper, the laser ablation inductively coupled plasma mass spectrometer was first used in the field of precious metal detection, and the laser ablation inductively coupled plasma mass spectrometer, as a high-precision instrument, has been used in geology, chemistry, mineralogy, etc. However, it has not been applied in the field of precious metal detection, and the content of impurity elements in high-purity gold jewelry is generally at trace or trace levels. Therefore, the use of laser ablation inductively coupled plasma mass spectrometry as a new detection method can make up for the shortcomings of existing methods. Specifically This method eliminates the pretreatment of sample dissolution, and directly tests the sample, which has the characteristics of green, real-time, minimal damage and accurate element determination

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