Infrared Absorption Spectrum Representation of Amber and Its Imitation
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摘要: 目前,中国珠宝市场上对琥珀产品的鉴定存在较大的困难。以琥珀及其常见仿制品为研究对象,采用常规的宝石学测试、傅里叶变换红外光谱仪以及其计算机二次微分阶拟合处理技术,测试了样品的红外吸收光谱,剖析琥珀中所含C官能团的种类和特征,寻找琥珀与仿制品之间的差异和联系。结果表明,不同产地琥珀的红外吸收光谱在1 700 cm-1处存有差异;琥珀与天然树脂如柯巴树脂、硬树脂的区别在于:前者具有脂肪族结构特征吸收峰,后者在3 080 cm-1处有由ν(CH)伸缩振动所致的红外吸收弱谱带以及较明显的、位于888 cm-1处、由γ(C—H)面外弯曲振动所致的红外吸收弱谱带;琥珀和合成树脂在2 8003 000cm-1和4001 500 cm-1范围内存在较大的差异。Abstract: Recently,it is more difficult to identify amber products in Chinese jewelry market.The amber and its familiar imitation samples are tested with the means of conventional gemmological methods,and FTIR and its technique of computer second derivative order for analysing the kinds and characteristics of carbon functional group in amber and searching for differences between the amber and its imitation samples.The results indicate that the absorption spectra of amber samples from different areas at 1 700 cm-1are different.The difference between amber and natural resin is that the amber has characteristic absorption of aliphatic texture while natural resinc copal resin and anime have the weak absorption band at 3 080 cm-1 caused by telescopic vibration of ν(CH) and the absorption band at 888 cm-1 caused by bending vibration of γ(CH).There are great differences in 2 800~3 000 cm-1 and 400~1 500 cm-1 between the amber and synthetic resin samples.
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Keywords:
- amber /
- imitation /
- infrared absorption spectrum /
- functional group
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