常见染色珍珠的光谱特征分析  

Analysis of Spectral Characteristics of Common Dyed Pearls

作　　者：占建翔 杨蕾琪 于杰[1] 崔小英 周晓龙[1] ZHAN Jianxiang YANG Leiqi YU Jie CUI Xiaoying ZHOU Xiaolong(Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650000, China Research Center for Analysis and Measurement, Kunming University of Science and Technology, Kunming 650106, China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]昆明理工大学分析测试研究中心,云南昆明650106

出　　处：《昆明理工大学学报（自然科学版）》2017年第5期23-27,共5页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(51361016);昆明理工大学引进人才科研启动基金项目(KKZ3201751043);昆明理工大学分析测试基金项目(2016T20040070)

摘　　要：染色处理在珍珠改善中较为普遍.通过对天然的及染色处理的黄色、黑色海水珍珠分别进行紫外-可见分光光谱、红外光谱以及激光拉曼光谱测试,研究分析了天然与染色珍珠的图谱特征,结果表明:天然黄色珍珠以355 nm为中心的紫外-可见光谱吸收宽谱带为有机致色因子所致,而染色黄色珍珠的450 500 nm宽吸收带由染色剂产生.天然黑色珍珠的紫外-可见光谱特征为天然黑色素的520 nm、700 nm吸收峰,而染色黑色珍珠无此峰.天然黄色珍珠的红外光谱具有文石的703 cm^(-1)和882 cm^(-1)吸收峰,染色黄色珍珠因文石结构被染料破坏而不可见文石的703 cm^(-1)和882 cm^(-1)吸收峰.黑色珍珠难以通过红外光谱区分天然、染色样品.天然黄色珍珠的拉曼光谱明显可见文石引起的1 086 cm^(-1)、704 cm^(-1)和100 300 cm^(-1)谱峰,而染色黄色珍珠较强的荧光背景可能是有机染料沉积或是染色剂破坏了文石结构所致,染色黑色珍珠的拉曼光谱在1 370 cm^(-1)附近存在多个染料引起的强吸收峰.Dyeing treatment is common in pearl improvement. In this paper, the ultraviolet -visible （UV） spec- troscopic spectroscopy, infra - red （IR） spectroscopy and laser Raman spectroscopy were used to analyze the characteristics of dyed yellow and black pearls and their natural counterparts. Experiments show that the UV spectrum of natural yellow pearls has 355 nm wide absorption band caused by organic coloring factor, while the absorption peaks of dyed yellow one are at 450 500 nm caused by the coloring agent. The UV spectrum of natural black pearls has 520 nm, 700 nm natural melanin absorption peaks that the dyed does not have. The IR spectrum of natural yellow pearls has 703 cm- 1, 882 cm- 1 absorption peaks caused by aragonite, while the dyed does not have because the structure of the aragonite is destroyed. It is difficult to distinguish natural black pearls from dyed black pearls by infrared spectroscopy. Natural yellow pearls have 1 086 cm -1, 704 cm-1 , 100 300 cm-1 Raman shift peaks caused by aragonite. The Raman spectra of dyed yellow pearls has a strong fluorescent back- ground due to organic dye deposition. Different from the natural black pearls, the dyed black pears have many dye -induced Raman shift peaks around 1 370 cm- 1.

关 键 词：天然珍珠 染色珍珠 光谱分析 

分 类 号：TS933.23[轻工技术与工程]