几种有机磷农药的光谱特性研究

应用Edinburgh FLS920P光谱仪分别测量了对硫磷,甲基对硫磷和水胺硫磷这三种有机磷农药甲醇溶液和乙醇溶液的吸收光谱和荧光光谱,并讨论其光谱特性和机理。结果表明,它们在紫外光的激励下都产生较强的吸收峰和荧光峰,对硫磷、甲基对硫磷和水胺硫磷的甲醇/乙醇溶液的荧光峰特征符合共轭芳族化合物荧光峰随着溶剂极性增大而红移的特点。研究结果为光谱技术应用于食品安全监管领域的农药种类鉴别和农药残留检测提供帮助。

The study of spectral characteristics of several organophosphate pesticides

Using Edinburgh FLS920P spectrometer, the authors obtained the UV-visible spectrum and fluorescence spectrum of parathion, metaphos and isocarbophos in their solution of methanol and ethanol respectively, and discussed their spectral characteristics and their mechanisms. Results show that they all have obvious absorption and fluorescence under the excitation of ultraviolet. The absorption peaks of parathion, metaphos and isocarbophos in their methanol and ethanol solution respectively are at 304 nm/298 nm, 304 nm/304 nm and 286 nm/286 nm. The peak wavelengths of fluorescence are at 404 nm/403 nm, 407 nm/ 402 nm and 423 nm/415 nm, fitting fluorescence characteristics of conjugated aromatic compounds that the peak will have red shift with the increasing solvent polarity. The results may contribute to the application of spectral technique in the distinction of pesticides and detection of residues of pesticides in the area of food security supervision.