Fluorescence spectra of methyl parathion and its characteristic

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 multifunctional 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 valve 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-320mn. 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 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.