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| Quantification of Au in Gold Ornaments Obtained by Different Electroformed Process |
| JIN Xu-guang1, 2, WANG Jin-zhuan1, 2*, LI Bei1, 2, QUE Wan-ting1, 2, WANG Liang1, 2, ZHANG Fan1, 2, ZHANG Chi1, ZHOU Jun-gui1, FU Rong-jin1 |
1. Nanjing Institute of Supervision & Testing on Product Quality （Nanjing Institute of Quality Development and Advanced Technology Application）, Nanjing 210019, China
2. National Center of Inspection & Testing on Gold and Silver Products Quality (Nanjing), Nanjing 210019, China
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Abstract Determining the amount of gold and impurity in electroformed gold ornaments is mainly performed by the cupellation method and the inductively coupled plasma atomic emission spectrometry (ICP-AES). However, the gold contents of electroformed gold ornaments are different according to these two methods, especially whether the gold ornaments are prepared by electroformed process from cyanide or non-cyanide bath. In the paper, the content of 26 impurity elements for gold samples was determined by glow discharge mass spectrometry (GDMS). The measured results are high for every impurity according to the instrument's relative sensitivity factors（RSF. The ratios of the instrument RSF and corrected RSF range from 0.96 to 1.90 for 16 elements except the copper and chromium elements. The ratios for these two elements are 3.01 and 3.91 respectively. Thus, the results show that the relative sensitivity factors of the instrument can be used for quantitative analysis of impurities from gold ornaments. Besides, the GDMS method was used to determine gold contents, with fire assay and ICP-AES as controls. The gold content of GDMS method is consistent with that of the fire assay and ICP-AES for the electroformed gold ornaments from the non-cyanide bath, but the gold content of GDMS method for electroformed gold ornaments from the cyanide bath is still consistent with that of the fire assay, but that is lower than that of ICP-AES. It indicates that the GDMS and fire assay methods are suitable for the accurate determination of gold content for the electroformed gold ornaments from cyanide/non-cyanide baths, whereas the ICP-AES method is only suitable for the electroformed gold ornaments from the non-cyanide bath. Besides, compared with the ICP-AES method, the carbon and nitrogen elements can be tested by GDMS method. It was revealed that the contents of carbon, nitrogen, sodium, and potassium elements determined by the GDMS method for electroformed gold ornaments from cyanide bath were significantly higher than those for the electroformed gold ornaments from the non-cyanide bath. It can be used to infer the possible preparation process of the electroformed gold ornaments.
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Received: 2022-04-25
Accepted: 2022-08-03
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Corresponding Authors:
WANG Jin-zhuan
E-mail: wangjinzhuan33@163.com
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