光谱学与光谱分析 |
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Density Functional Theory Calculation and Raman Spectroscopy Studies of Organophosphorus Pesticides |
HUANG Shuang-gen1, 2, WU Yan1, HU Jian-ping2, LIU Mu-hua1* |
1. Optics-Electrics Application of Biomaterials Lab,College of Engineering, Jiangxi Agricultural University,Nanchang 330045,China 2. Key Laboratory of Modern Agriculture Equipment and Technology,Ministry of Education,Jiangsu University,Zhenjiang 212013,China |
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Abstract Organophosphorus pesticides were often used for prevention and control disease and insect of plant, and are acute toxic to human and livestock by anti-ache activity. The molecular geometry of three organophosphorus pesticides(dimethoate, trichlorfon and phosalone) were constructed on Gauss View3.07, and Density functional theory (DFT) was used to optimize and calculate the vibrational wavenumbers of three organophosphorus pesticides by B3LYP hybrid functional and 6-31G(d,p) basis set. The experimental spectra of three organophosphorus pesticides were compared with the theoretically calculated spectra and Surface-enhanced Raman Scattering spectra (SERS). The results indicated that the experimental spectra and theoretically calculated spectra of three organophosphorus pesticides have a very good match. The Raman peaks of three organophosphorus pesticides were roundly assigned between the range of 400~1 800 cm-1, and the characteristics peaks of three organophosphorus pesticides were found. The Raman vibration peak of organophosphorus pesticide may appear similar characteristic peak. The pesticide contained PO is between 1 140 and 1 320 cm-1, the pesticide contained PS is in the range 535~750 cm-1, and the organophosphorus pesticide contained P—O—C is n the range 920~1 088 cm-1. The different characteristic peaks of three pesticides were found by the contrast of the surface enhanced Raman spectra. This shows that the SERS method can be used to identify the organophosphorus pesticide. The results can furnish a theoretical support for qualitative and quantitative analysis of organophosphorus pesticide.
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Received: 2015-12-30
Accepted: 2016-04-24
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Corresponding Authors:
LIU Mu-hua
E-mail: Suikelmh@sohu.com
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