塔希提黑珍珠和处理珍珠的可见吸收光谱表征

Visible Absorption Spectrum Representation of Tahitian Black Pearls and Treated Pearls

采用美国的USB 2000光纤光谱仪对塔希提黑珍珠、黑蝶贝、人工染色处理珍珠及三角帆蚌样品的可见吸收光谱进行了测试和研究。结果表明:塔希提黑珍珠及黑蝶贝在可见光区内存在3处特征的吸收宽谱带(即a带、b带和c带),与人工染色黑色珍珠和三角帆蚌的可见吸收光谱特征具本质上的差别,因而具有一定的鉴定意义。对部分样品的激光拉曼光谱进行了测试,并对塔希提黑珍珠的可见吸收光谱起因一并予以了剖析。

The visible absorption spectra of a number of Tahitian black pearls, Pinctada magaritifera, dyed freshwater pearls and Hyriopsis cumingi have been tested by the USB 2000 Fiber Optic Spectrometer. The results show that the three particular absorption bands（a, b and c） of Tahitian black pearls and Pinctada magaritifera are different from that of the dyed freshwater pearls and Hyriopsis cumingi. Therefore, the visible absorption spectra of the pearls have the significance in the identification of Tahitian black pearls and dyed freshwater pearls. Some samples are tested by Raman spectrometer and the origin of the visible absorption spectra of Tahitian black pearls is studied.