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

摘要

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 ~(63)Ni ionization source.The limits of detection (LODs)were 5.3 x 10~(-10),5.8 x 10~(-10),and 4.5 x 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 repeat-ability at the 5mu g 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.