文献类型：期刊文献

英文题名：Study of Coloration Mechanism of Cultured Freshwater Pearls from Mollusk Hyriopsis cumingii

作者：Shi, L.[1];Liu, X.[1];Mao, J.[1];Han, X.[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2014

卷号：81

期号：1

起止页码：97

外文期刊名：JOURNAL OF APPLIED SPECTROSCOPY

收录：;EI(收录号：20242716622390);WOS:【SCI-EXPANDED(收录号:WOS:000333212200016)】；

语种：英文

外文关键词：freshwater cultured pearls; Hyriopsis cumingii; coloration; plasma emission; Raman and IR spectra

摘要：Trace metal elements and pigments in cultured freshwater pearls from the mollusk Hyriopsis cumingii have been analyzed by plasma emission spectroscopy, Raman scattering, and infrared spectroscopy to investigate the coloration mechanism. The colors of the pearls are closely related to the presence of trace elements and the na-ture of the pigments. Purple pearls show much higher Ti, Ag, Mg, and Zn concentrations compared with the other samples. The concentration of polyenic molecules without methyl groups in the purple pearls is higher than in orange pearls. The organic matrix has been extracted via a decalcification process involving a weak acid (acetic acid). The estimated chemical formula of the pearl pigment is CHO-(-CH = CH-)10-OCH2OH.