上蜡翡翠的荧光光谱特征研究  

Study on the Fluorescence Spectral Characteristics of Waxing Jadeite

作　　者：李浩东 李举子[1] 陈彦霖 黄钰静 LI Hao-dong;LI Ju-zi;CHEN Yan-lin;HUANG Yu-jing(Gemmological Institute,China University of Geosciences(Wuhan),Wuhan 430074,China)

机构地区：[1]中国地质大学(武汉)珠宝学院,湖北武汉430074

出　　处：《光谱学与光谱分析》2023年第3期883-889,共7页Spectroscopy and Spectral Analysis

基　　金：国家重点研发计划项目(2018YFF0215400);中国地质大学(武汉)珠宝检测技术创新中心项目(CIGTWZ-2022006)资助。

摘　　要：翡翠是目前市场上最常见的玉石之一,通过上蜡掩盖翡翠表面微小的缺陷,提高其光泽,这种加工手段是消费者普遍接受的。A货翡翠上蜡、B货和B+C货翡翠以及B货和B+C货翡翠上蜡后在紫外灯下都会有荧光,如何快速有效地鉴别这些翡翠是目前需要解决的问题。收集了目前市场上常见的A货,B货,B+C货翡翠和两种优化蜡,并使用优化蜡对这些翡翠上蜡,采用紫外荧光灯、红外光谱仪和荧光光谱仪对上蜡前后的样品进行了系统的对比研究。结果显示:在紫外荧光灯下A货翡翠无荧光,B货和B+C货翡翠有弱—中等的荧光,上蜡后的翡翠均会发出相似程度的荧光。红外光谱直接透射法显示在官能团区B货和B+C货翡翠中芳香族化合物的芳环上官能团ν(C—H)伸缩振动会产生的3064,3032,3003 cm^(-1)吸收峰;优质蜡由烷烃化合物官能团ν(—CH_(2)—)伸缩振动分别产生2915和2846 cm^(-1)吸收峰,同时还可能存在官能团ν(C═O)伸缩振动所致的1681 cm^(-1)处吸收峰,而川蜡中只检测到甲基和亚甲基产生的吸收峰。荧光光谱显示A货翡翠无荧光反应,B货和B+C货翡翠有荧光反应,部分B+C货翡翠和B货翡翠的图谱相似性很高,说明荧光是充填物发出的,染料中的离子会导致荧光峰产生偏移和荧光强度的改变。根据B+C货翡翠荧光峰位置的不同可以分为三类,激发波长分别为350,358和370 nm,发射波长分别为370,420和414/434 nm。两种优化蜡的荧光峰明显不同,且优质蜡的荧光强度高于川蜡。上蜡后A货翡翠会出现优化蜡的荧光峰,荧光强度和翡翠表面蜡浓度有关。B货和B+C货翡翠上蜡后同样会出现优化蜡的荧光峰,不过由于优化蜡的浓度较低,最强的荧光峰都是翡翠中充填物发出的,且相比于上蜡前,荧光峰会有红移。荧光光谱可以作为一种快速无损的检测手段区分上蜡前后的A货,B货和B+C货翡翠,对上蜡后的A货翡翠与B货或B+C�Jadeite is one of the most common jades in the current market,and the processing means to cover up the tiny defects on the surface of jadeite and improve its luster by waxing is commonly accepted by consumers.The waxing of A jadeite,B and B+C jadeite and B and B+C jadeite will fluoresce under a UV lamp after waxing,and how to identify these jadeites quickly and effectively is a problem that needs to be solved now.The common A,B,B+C jadeite and two kinds of optimized waxes in the current market were collected,and the optimized waxes were used to wax this jadeite,and the samples before and after waxing were systematically compared and studied by using a UV fluorescent lamp,and infrared spectrometer and fluorescence spectrometer.The results showed that the A jadeite did not fluoresce under UV fluorescent light,the B and B+C jadeite had weak-medium fluorescence,and all the jadeites emitted similar fluorescence after waxing.Infrared spectroscopy direct transmission method showed that the absorption peaks of 3064,3032,3003 cm^(-1) were generated by the stretching vibration of the functional groupν(C—H)on the aromatic ring of the aromatic compounds in the functional group area of B and B+C jadeite;the high-quality waxes were generated by the stretching vibration of the functional groupν(—CH_(2)—)of the alkane compounds absorption peaks at 2915,2846 cm^(-1) and possibly 1681 cm^(-1) due to the stretching vibration of the functional groupν(C═O),respectively.In contrast,only absorption peaks from methyl and methylene groups were detected in Chuan wax.The fluorescence spectra showed no fluorescence response for A jadeite and fluorescence response for B and B+C jadeite.The high similarity of the profiles of some B+C jadeite and B jadeite indicates that the filling emits the fluorescence,and the ions in the dyes cause the fluorescence peaks to be shifted and the fluorescence intensity to change.According to the B+C,jadeite fluorescence peak position can be divided into three categories,excitation wavelengths were 3

关 键 词：翡翠 上蜡翡翠 荧光光谱 红外光谱 

分 类 号：P575.4[天文地球—矿物学]