Estudo comparativo entre as técnicas de ionização por impacto de elétrons e ionização química na análise do inseticida permetrina via GC/MS-IT

Abstract

Pyrethroids, including permethrin, are insecticides chemically similar to pyrethrins, modified with the addition of functional groups. They are used against a variety of pests and contrai ectoparasites, biting flies, and cockroaches. ln this paper we used gas cromatography coupled to an ion trap mass spectrometer to compare two ionization technics: Electron Impact Ionization and Chemical Ionization. The results show less ionic fragmentation on chemical ionization than on electron impact ionization. The possiblechemical structures produced on the fragmentation process as well as physical chemistry parameters are discussed in this work. The detection limits were in ppm concentration range.