紫外—可见光纤光谱仪在无色宝石检测中的应用

Application of UV-Vis Spectrometer in the Detection of Colorless Gemstones

物质对不同波长的光会进行选择吸收,紫外—可见光纤光谱仪利用这一特征来对物质进行定性分析,通过紫外可见吸收光谱帮助判断物质的结构及化学组成。紫外可见吸收光谱作为需要检测的项目也列入现行国家标准GB/T 16553-2017《珠宝玉石鉴定》,成为实验室目前常见的检测手段之一。许多无色宝石品种外观差异较小,肉眼很难区分,但因成分、结构等差异,呈现出不同的紫外可见吸收光谱特征。因此,紫外—可见光纤光谱仪是检测鉴定工作不可或缺的设备之一,具有无损、准确的特点。本文通过查阅文献,以及对多种无色宝石样品测试,综合论述了紫外可见吸收光谱在天然无色宝石检测中的应用,如钻石、锆石、托帕石、水晶;紫外可见吸收光谱在鉴别合成宝石、处理宝石方面的应用,如合成钻石;以及紫外可见吸收光谱在宝石研究方面的应用,如钻石结构类型判断、结构特征分析等。同时本文得到了多种无色宝石的紫外吸收光谱特征,丰富了光谱数据,为检测鉴定提供参考。

Different substances selectively absorb different wavelengths of light.UV-Vis spectrometer makes use of this feature to conduct qualitative analysis of substances,helping to analyze the structural and chemical compositions of substances.UV-Vis spectrum,which becomes one of the most common methods of detecting colorless gemstones in laboratory,was listed in National Standard GB/T 16553-2017 Identification of Jewelry and Jade.Some colorless gems with small differences in appearance are difficult to distinguish with naked eyes,especially in the detection of natural and synthetic diamonds.Different colorless gemstones show different factors of absorption in UV-Vis spectrum because of the varieties in compositions and structures.Therefore,UV-Vis spectrometer has become one of the indispensable equipments for detection and identification with nondestructive and accurate features.There are three main parts are comprehensively discussed by referring to literature and testing a variety of colorless gemstone samples.First of all,the application of UV-Vis absorption spectroscopy in the detection of natural colorless gemstones,such as diamond,zircon,topaz and crystal.Secondly,UV-Vis absorption spectrum provides information for identifying synthetic gems and treating gems,like synthetic diamond.Last but not least,the application of UV-Vis absorption spectroscopy in the study of gemstones,such as the determination of diamond structure type and analysis of structural characteristics.At the same time,UV-Vis spectrum of different colorless gemstones were obtained in this paper,which enriched spectral data and provided reference for detection and identification.