IDENTIFICATION OF B JADE BY FTIR SPECTROMETER WITH NEAR-IR FIBRE-OPTIC PROBE ACCESSORY
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摘要: 带有近红外光纤探头附件的红外光谱仪是一种有效的、非破坏性鉴定工具，用于鉴定漂白及聚合物充填处理的翡翠（所谓翡翠B货）.此项技术在鉴定翡翠中具有下列优点：不但能对较厚的或镶嵌的翡翠饰品进行鉴定，而且能对非常大的翡翠饰品，如手镯、大型雕件等进行鉴定，这对其它红外技术来讲是望尘莫及的。本项技术的关键在于使用了光纤探头，并且在近红外频率范围进行测试。因此，能获得7400cm-1至4000cm-1频率范围内清晰明确的近红外光谱。翡翠B货在此频率范围内产生的吸收光谱起因于C－H键伸缩振动与弯曲振动的合频以及伸缩振动的倍频。Abstract: A FTIR spectrometer with a near-IR fibre-optic probe accessory has been found to be a useful and non-destructive tool for identification of bleached and polymer-impregnated jadeites (so-called B jade).
This method has the advantage of application to the testing of not only very thick or mounted stones, but also very large samples such as bracelets, which are difficult to test with other IR techniques. The important features of the technique are use of the fibre-optic probe and measurement of the near-IR frequency range. Therefore, clear near-IR absorption spectra from 7400 to 4000 cm-1 could be obtained. The absorptions are caused mainly by the combination of stretching and bending vibrations and the harmonics of stretching vibration of C—H bonds.-
Keywords:
- B jade /
- identification /
- near-IR /
- fibre-optic
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[1] Fritsch E, Wu S T T, Moses T, McClure S F and Moon M. Identification of bleached and polymer-impregnated jadeite.
[2] Hurwit K. Gem trade lab notes: impregnated jadeite jade. Gems & Gemology, 1989, 25 (4): 239~40
[3] Gems & Gemology, 1992. 28: 176~87
[3] Quek P L and Tan T L. Identification of B jade by diffuse reflectance infrared Fourier transform (DR1FT) spectroscopy. The Journal of Gemmology, 1997、25: 417~27
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