衰减全反射红外光谱技术(ATR-FTIR)在琥珀检测与研究中的应用

Application of Attenuated Total Reflectance Infrared Spectroscopy(ATR-FTIR) for Amber Identification and Research

红外光谱分析是矿物材料研究中常用的一种表征手段,而衰减全反射红外光谱(ATRF-FTIR)由于其快速、无损且能够进行微区检测等优势在而被广泛使用。以不同产地琥珀、柯巴树脂和覆膜处理琥珀为研究对象,通过BRUKER LUMOS独立式红外显微镜对样品的ATR-FTIR光谱进行测试与分析。结果表明:v(C=C)伸缩振动在1 643 cm^(-1)和δ(芳C—H)弯曲振动在889 cm^(-1)两处的红外吸收谱带均出现在多米尼加和俄罗斯琥珀中;由v(C—O)伸缩振动在1 300~925 cm^(-1)范围内的红外吸收谱带对于琥珀的产地具有一定的指示意义;v_(as)(=CH_2)不对称伸缩振动在3 080,1 643和887 cm^(-1)三处的红外吸收谱带为柯巴树脂所特有,具有重要的鉴定意义;覆膜琥珀显示琥珀和人工树脂混合红外光谱,除琥珀特有的红外光谱之外,760和702 cm^(-1)红外吸收谱带为人工树脂中γ(芳X—H)面外弯曲振动所致。ATR-FTIR在琥珀的成因、产地及优化处理品种的检测具有重要的意义。

Infrared spectral analysis is a commonly used means to research the characteristics of mineral material .Attenuated total internal reflectance infrared spectroscopy （ATR -FTIR ） is widely used dues to its advantages such as rapidness , non-destructiveness and micro region detection .This paper focuses on different areas of amber ,copal resin ,coated amber to further study its ATR-FTIR through the BRUKER LUMOS independent type infrared microscope .The result shows ：the two infrared absorption spectrum which are 1 643 cm^-1 due to stretching vibration of ν（C C） and 889 cm-1 due to deformation vibration of δ（arene C—H）are present in the amber originated in Dominica and Russia ;the infrared absorption spectrum band lies at 1 300~925 cm ^-1 due to stretching vibration of ν（C—O） has a certain instruction significance for the origin of amber ;the three absorption spectrum of 3 080 cm ^-1 which is due to dis-symmetry stretching vibration of νas （ CH2 ） ,1 643 and 887 cm ^-1 can be used as characteristic of copal resin and have identification significance ;coated amber displays amber and artificial resin mixing infrared spectrum ,which besides the characteristic infrared spectrum of amber ,760 and 702 cm^-1 infrared spectrum are caused by out-plane bending vibration of γ（arene C— H） of resin .ATR-FTIR has important significance in the identification of cause ,origin and enhancement varieties of amber .