GC Determination of 3 Residual Fungicides in Peach with Matrix Solid Phase Dispersion of Sample

Three residual fungicides i.e.,pentachloroaniline,methyl pentachlorophenyl sulfide and procymidone,were separated from the peach sample by pretreatment with matrix solid phase dispersion,packing into a glass column and eluting with mixed solvent of n-hexane and dichloromethane.The eluate was evaporated to near dryness,and residue dissolved in 1 mL of acetone and used for GC-analysis.Capillary chromatographic column and electron capture detector were used in the GC-determination.Matrix matching method was used in preparation of calibration curve.Test for recovery was made at concentration levels of 0.01,0.05 and 0.10 mg·L-1 of the mixed standard solution of the fungicides,and values of recovery in the range of 82.6%-109.7% were obtained,with values of RSD′s (n=8) in the range of 3.3%-9.6%.Detection limits (3S/N) found were range from 0.1 to 0.4 μg·kg-1 for the 3 fungicides.