FIIR was applied in the analysis of Lapis Micae Aureu samples, and the corresponding spectra were interpreted. The results indicated that the absorption characteristics of spectra of Lapis Micae Aureu samples were similar to those of the layered silicate minerals. The absorption area was divided into four regions: OH stretching vibration absorption at 3 700- 3 000 cm-1, H20 bending vibration absorption at 1 620 cm-1, Si-O stretching vibration absorption at 1 000 cm-1 and Si-O bending vibration absorption at 550 -400 cm-1. The results showed that, OH vibration absorption intensity was in positive proportion to water content in Lapis Micae Aureu samples and the absorption frequency was related to the type of the interlayer cation. Si-O vibration absorption frequency was affected by Al substituting Si in tetrahedroid, and the absorption frequency reflects the type of cation in octahedron. Thus the infrared spectral characteristics of Lapis Micae Aureu samples could reflect its internal structure, and could be used to evaluate its quality status.%采用傅立叶红外光谱法分析了金礞石试样,对所得图谱进行解析,发现试样的红外光谱具备层状硅酸盐矿物的吸收特征.其吸收带主要分为4个区域:3 700～3 000 cm-1区间的OH伸缩振动吸收,1 620 cm-1左右处的H2O弯曲振动吸收,1 000 cm-1左右处的Si-O伸缩振动吸收和550～400 cm-1区间的Si-O弯曲振动吸收.分析表明,OH振动吸收强度与样品中的含水量成正比,吸收频率与层间阳离子种类有关;Si-O振动吸收频率受四面体中Al替代Si的影响;吸收峰的简并分裂程度则可反映八面体阳离子的类型.可见金礞石的红外光谱特征能反映其内部的结构特点,可用于阐明药材的质量状况,并为其进一步的质量研究提供了重要的参考资料.
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