Study on Spectral Characteristics of Several Common Pesticides

WANG Lexin; CHEN Danping; ZHAO Zhimin; ZHANG Xinyan; ZHU Wenxia; ZHANG Ping

doi:10.15933/j.cnki.1004-3268.2015.04.020

Abstract：The absorption and fluorescence spectra of aqueous solution of several common pesticides (seed coating agent of soybean,benzal chloride,imidacloprid,and buprofezin) were studied,to provide an basis for detection of pesticide residue. The experimental results showed that the absorption rates of pesti-cides in the ultraviolet region were stronger than in visible light region,and the maximum absorption wave-length and the absorption rate of different pesticides were different. The absorption peaks of buprofezin lo-cated at 227. 5 nm and 285 nm. The absorption peaks of imidacloprid located at 210 nm and 269. 5 nm. The absorption peaks of benzal chloride located at 212,238. 5,317,331 nm. The absorption peaks of seed coating agent of soybean located at 226,284. 5,330,509 nm. Aqueous solutions of these four pesticides were able to produce fluorescence,and all of them had strong fluorescence characteristics. The fluores-cence peaks of buprofezin located at 354 nm and 680 nm. The fluorescence peaks of imidacloprid located at 352 nm and 676 nm. The fluorescence peak of benzal chloride located at 414 nm. The fluorescence peaks of seed coating agent of soybean located at 352 nm and 675 nm. Under the same excitation condi-tion,the fluorescence spectra of different pesticides had different strength and shape,so the category of pesticide could be distinguished by comparing the spectra.