紫色翡翠的实验室鉴别特征  

Laboratory Identification Characteristic of Purple Jadeite

作　　者：李淑玲 周海杰 林哲琼 LI Shuling;ZHOU Haijie;LIN Zheqiong(National Jewelry Testing Center(Guangdong)Co.,Ltd.,Guangzhou 511483,China)

机构地区：[1]国家珠宝检测中心(广东)有限责任公司,广东广州511483

出　　处：《宝石和宝石学杂志（中英文）》2022年第1期48-57,共10页Journal of Gems & Gemmology

基　　金：NGTC科研项目基金:紫色翡翠表面优化增色研究(NGTC2019030)。

摘　　要：近来,紫色翡翠的检测越来越繁杂,缺乏系统流程。通过收集市场常见的紫色翡翠样品(包括天然翡翠、经漂白充填染色处理翡翠、染色处理翡翠),对其进行红外光谱、超景深显微镜、DiamondView^(TM)和紫外-可见分光光度计等多种仪器测试分析。结果表明,经漂白充填染色处理翡翠样品的中红外光谱具3056、3035、2872 cm^(-1)等人工树脂充填物引发的吸收峰,部分染色处理翡翠样品的近红外光谱具有4327、4257 cm^(-1)甲基、亚甲基吸收峰,提示有机物的存在;超景深显微镜观察显示,染色处理翡翠样品中的染料在表面呈颗粒状分布,内部呈脉状分布,富集在裂隙或凹陷处;DiamondView^(TM)下,经漂白充填染色处理翡翠样品和染色处理翡翠样品具有呈团块状紫色、紫红色荧光分布于蓝色、绿色基底上或仅见蓝色脉状荧光;紫外-可见分光光谱结果显示,染色处理翡翠样品出现以560、600 nm或以550、590、650 nm为中心的吸收谱带。通过以上特征可以将天然、经漂白充填染色处理、染色处理的紫色翡翠鉴别开来,从而制定一套检测流程,为实验室准确、快速、无损鉴别紫色翡翠提供可行性依据。Recently,the identification of purple jadeite has become more and more complicated and lacks of a systematic process.Common purple jadeite samples(including natural jadeite,bleached,filled and dyed jadeite,dyed jadeite)were collected from the market for infrared spectroscopy,ultra-depth-of-field microscope,DiamondView^(TM),UV-Vis spectrophotometer and other instruments tests and analyses.The results show that in the infrared spectrum,the bleached,filled and dyed samples in the mid-infrared region show absorption peaks caused by artificial resin fillings at 3056,3035,and 2872 cm^(-1).Some dyed samples in the near-infrared region have 4327 cm^(-1)and 4257 cm^(-1)-CH_(3) and-CH_(2)-absorption peaks,which indicates the existence of organic matter.Dyed jadeite samples under super-depth-of-field microscope show that the dyes distribute in granular form on the surface,and vein in the interior and concentrate in cracks or depressions.Under DiamondView^(TM),bleached,filled and dyed samples and dyed samples show purple and purple-red fluorescence in clumps distribute on the blue and green substrates,or only blue vein-like fluorescence can be seen.Under UV-Vis spectrophotometer,the dyed samples show absorption bands centered at 560,600 nm or 550,590,650 nm.These characteristics can distinguish bleached,filled and dyed jadeite samples and dyed jadeite samples from natural samples.On this basis,the laboratory identification process can be optimized to provide a feasible basis for the laboratory to accurately,quickly and non-destructively identify purple jadeite.

关 键 词：紫色翡翠 染色处理 谱学特征 

分 类 号：TS93[轻工技术与工程]