安徽绿松石充填材料及处理特征初探

Filling Material and Characteristic of Polymer-Impregnated Turquoise in Anhui Province

  • 摘要: 采用宝石学常规测试、傅里叶红外光谱仪、显微激光拉曼光谱仪、紫外-可见分光光度计等方法测试了几种用于绿松石充填的胶水材料及对应处理后的安徽绿松石样品。结果表明,疏松原矿绿松石的相对密度为2.25,胶水充填的绿松石相对密度更低,低于理论值。液态胶水的红外光谱中普遍有位于2 978 cm-1处—CH3键、2 930 cm-1处—CH2键、1 722 cm-1附近C=O键和1 256 cm-1附近C—O—C键的振动峰;固化胶水主要基团的红外振动峰与液态胶水基本一致;固化剂的红外光谱中1 715 cm-1处振动峰归属于v(C=O)伸缩振动,1 418、1 327 cm-1处振动峰归属于б(COO)弯曲振动。胶水充填绿松石样品的红外光谱中2 920~2 940 cm-1范围内为v(CH2)伸缩振动、1 720~1 730 cm-1范围内为酯类v(C=O)伸缩振动、1 390~1 470 cm-1内б(C—H)弯曲振动和1 220~1 300 cm-1范围内v(COC)伸缩振动的特征峰指示了有机充填的特征;绿松石样品拉曼光谱显示2 890~2 990 cm-1范围内强而尖锐的v(C—H)伸缩振动峰也可作为充填鉴定的辅助依据。绿松石样品在紫外-可见光谱中显示由Fe3+离子所致432 nm吸收带和Cu(H2O)4 2+所致600 nm以后宽缓吸收带,在475 nm和515 nm处显示与染色粉有关的吸收带。

     

    Abstract: Features of different kinds of organic polymer filling materials and corresponding organic polymer-impregnated turquoise samples were tested with the help of Fourier transform infrared spectroscopy, laser Raman spectroscopy and UV-Vis spectrophotometer. The spectral characteristics could be a reference to the identification of these organic polymer-impregnated turquoise.The vibrational peaks of —CH3 at 2 978 cm-1, —CH2 at 2 930 cm-1, C=O bands at 1 722 cm-1 and COC bands at 1 256 cm-1 are common in the infrared spectrum of liquid glue samples. In the infrared spectra of curing agent, the vibration peak at 1 715 cm-1 is attributed to the stretching vibration of C=O and the vibration peaks at 1 418, 1 327 cm-1 are attributed to the bending vibration of COO. The infrared vibration peaks of the main group of the cured glue samples were the same as the liquid glue samples. The vibration peaks of the organic polymer-impregnated filled turquoise in the infrared spectrum appeared in 2 920-2 940, 1 720-1 730, 1 390-1 470 cm-1 or 1 220-1 300 cm-1. Raman spectrum showed high fluorescence background. However, different vibration peaks in 2 890-2 990 cm-1 could be evidence to identify organic polymer-impregrated turquoise. In the UV-Vis absorption spectra of organic polymer-impregnated turquoise, absorption band caused by Fe3+ appeared at 432 nm and absorption band caused by Cu(H2O)4 2+ appeared at 600 nm, which was consistent with the characteristics of the untreated turquoise. UV-Vis spectra of dyed turquoise also showed absorption bands at 475 nm and 515 nm.

     

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