甲基对硫磷溶液的荧光光谱及其特性  

Fluorescence spectra of methyl parathion and its characteristic

作　　者：毕琳娜[1] 陈国庆[1] 王俊[1] 颜浩然[1] 

机构地区：[1]江南大学理学院,无锡214122

出　　处：《激光技术》2010年第2期253-257,共5页Laser Technology

基　　金：国家八六三高技术研究发展计划资助项目(2007AA10Z353)

摘　　要：为了研究甲基对硫磷溶液的荧光光谱及其特性,采用多功能光谱测量系统,对甲基对硫磷标准溶液在紫外光激励下的荧光光谱特性进行了实验研究。利用GAUSSIAN软件与量子力学理论进行了理论分析,获得了其荧光光谱的产生机理以及甲基对硫磷分子的相应跃迁能级差,估算了其中直线型结构的荧光团的电子跃迁能级差,估算值与理论值误差不大。结果表明,在波长为200nm～320nm的紫外光激励下,甲基对硫磷标准溶液产生4个荧光峰,分别位于435nm,467nm,567nm,650nm,最佳激励波长为200nm和295nm。4处荧光峰分别是溶剂丙酮分子中C=O上的n电子跃迁、硝基上的n电子跃迁、甲基对硫磷分子中氧原子与苯环形成的大共轭π电子结构跃迁以及P=S上的n电子跃迁共同作用产生。以上结果对食品安全监管等领域检测有机磷农药含量是有帮助的。In order to study the fluorescence spectra of methyl parathion and its characteristics, the spectral characteristics of standard methyl parathion solution induced by UV-light were experimentally studied with a multifunetional spectrometer system. Based on theoretical analysis by means of GAUSSIAN software and the methods of quantum mechanics, the mechanism of the fluorescence spectra of standard methyl parathion solution and the transition energy of methyl parathion were obtained and the transition energy of the linear structure fluorophore was estimated. The experimental value was a little different from the theoretical value. The results show that there are four fluorescence peaks generated when the standard methyl parathion solution is excited by UV light at the wavelength of 200nm -320nm. The peak position is located at 435nm, 467nm, 567nm and 650nm respectively. The best excitation wavelength is 200nm and 295nm. The four fluorescence peaks are generated by the combined actions of the methyl parathion and the acetone. In methyl parathion molecule, there are the transition of n electrons in nitryl, the transition of π electronic structure formed by the oxygen atom and the benzene ring and the transition of n electrons in P =S group. In acetone molecule, there is the transition of n electrons in C=O group. These results are helpful for testing organophosphorus pesticide＇ s content in the area such as food safety inspection.

关 键 词：光谱学 荧光特性 荧光分析法 有机磷农药 分子结构 能级 食品安全 

分 类 号：O433[机械工程—光学工程] S482.3[理学—光学]