Wang Li-hua, Zhou Pei-ling, Liu Yan, Tang Yun-hui
School of Materials Science and Technology, China University of Geoscience, Beijing 100083, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2005 Jun;25(6):866-9.
Seawater cultured pearl was studied by high resolution fourier transform infrared spectroscopy (FTIR) both before and after having been heated at 160 centigrade degree. The results of FTIR indicate that the main material in both samples is aragonite (CaCO3). But compared with the spectra of the seawater cultured pearl, there are some changes that happen in that of the heated sample. Some other peaks arise in the latter. And the intensities of these peaks increase with the heating time. Differential Thermal Analysis (DTA) curve of the seawater cultured pearl shows that seawater cultured pearl has no change between 25-160 degrees C except absorbed water evaporating from the sample. All these evidences prove that besides aragonite, there exists something else in the seawater cultured pearl. This component was determined to be pahuite by FTIR spectroscopic analysis. X-Ray Diffraction (XRD) analysis of the same sample came to the same conclusion.
采用高分辨率傅里叶变换红外光谱（FTIR）对海水养殖珍珠在160摄氏度加热前后进行了研究。FTIR结果表明，两个样品中的主要物质均为文石（CaCO3）。但与海水养殖珍珠的光谱相比，加热样品的光谱发生了一些变化。后者出现了一些其他峰。这些峰的强度随加热时间增加。海水养殖珍珠的差示热分析（DTA）曲线表明，在25-160摄氏度之间，海水养殖珍珠除了样品中的吸附水蒸发外没有变化。所有这些证据证明，除了文石外，海水养殖珍珠中还存在其他物质。通过FTIR光谱分析确定该成分是磷钙铝石。对同一样品的X射线衍射（XRD）分析得出了相同的结论。
