IR Absorption Spectrum Representation of Turquoise,Treated Turquoise and Imitation
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摘要: 采用红外反射光谱技术,对市面上常见的充填和压制处理绿松石、仿绿松石及天然绿松石制品的红外吸收光谱进行了研究和对比。结果表明:充填处理绿松石制品的红外吸收光谱具有由聚合物中νas(CH2)反对称伸缩振动和νs(CH2)对称伸缩振动致的吸收谱带(2 934~2 924,2 863~2854 cm-1)及ν(C＝O)伸缩振动所致的红外吸收特征谱带(1 739~1 718 cm-1);仿绿松石制品中则明显缺乏天然绿松石中的ν(OH)伸缩振动致红外吸收谱带(3 507,3 465 cm-1),并出现由νas(CH2)反对称伸缩振动和νs(CH2)对称伸缩振动及ν(C＝O)伸缩振动致红外吸收谱带以及由各自基团振动的红外吸收特征谱带(指纹区内)。依据这些特征的红外吸收光谱有助于将它们区分开。Abstract: By using the infrared reflection spectrum analysis technique,the filled,pressed,imitated and natural turquoises on gem markets are investigated.The results show that the IR peaks at 2 934~2 924,2 863~2 854 cm-1 are resulted from the asymmetrical stretching vibration and the symmetrical stretching vibration of CH2and the strectching vibration of ν(C＝O) peaks lie at 1 739~1 718 cm-1 in polymer of the treated and imitated turquoises.The imitated truquoises have the characteristic spectra of the asymmetrical stretching vibration and the symmetrical stretching vibration of CH2,and the vibration of ν(C＝O) and characteristic absorption bands of themselves.But,they lack any typical peaks of stretching vibration of hydroxyl of natural turquoise(3 507,3 465 cm-1).These typical IR spectra play an important role in distinguishing the treated and imitated turquoises from the natural turquoise.
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Keywords:
- turquoise /
- treated turquoise /
- turquoise imitation /
- infrared absorption spectrum
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