GC-MS DETERMINATION OF RESIDUAL FLUOSILAZOLE PROPICONAZOLE AND DIFENOCONAZOLE IN GREEN PEA

Residual amounts of fluosilazole (FSAZ),propiconazole (PPAZ) and difenoconazole (DFAZ) in green pea was determined by gas chromatography and mass spectrometry in hyphenation.The above mentioned pesticides were extracted from the sample with acetonitrile and purified by using Supelco Dual Layer ENVITM-Carb Ⅱ/PSA (500/500 mg) SPE Tube.The final extract was injected into GC for separation and followed by MS detection under EI ionization and synchronous SIM/SCAN data aquisition mode.The detection limit found for FSAZ,PPAZ and DFAZ were 0.001,0.003 and 0.005 mg·kg-1 respectively.Tests for precision and recovery were made at the concentration levels of 0.01,0.02 and 0.05 mg·kg-1,and values of RSD′s found were in the range of 5.0%-12.0%,and values of recovery were in the ranges of 60%-120%,70%-112% and 75%-110% respectively.