Analysis of Sevin,Amitraz, and Metalaxyl Pesticides Using Ion Mobility Spectrometry

Abstract

Positive ion mobility spectra of different pesticides, such as sevin or carbaryl (1‐napthyl methylcarbamate), amitraz (N,N′‐[(methylimino) dimethylidyne]di‐2,4‐xylidine), and metalaxyl (methyl‐N‐(2,6‐dimethylphenyl)‐N‐(2‐xylyl)‐DL‐alaninate) as carbamate, amidine, and alkaline groups, respectively, have been studied in air at ambient pressure using ion mobility spectrometry method with ⁶³Ni ionization source. The limits of detection (LODs) were 5.3×10^?10, 5.8×10^?10, and 4.5×10^?10 g for sevin, amitraz, and metalaxyl, respectively. The working range of these compounds was about three orders of magnitude and the relative standard deviation (RSD) of repeatability at the 5 µg mL^?1 level were all below 14%. Furthermore, in this study, the influences of IMS cell temperature on the ion mobility spectra of these compounds were investigated.