GC-MS Determination of Residual Amounts of 22 Pesticides in Textiles

GC-MS was applied to the determination of residual amounts of 22 pesticides in textiles. The sample was extracted with a mixture of n-hexane-acetone (1+1) by accelerated solvent extraction, and the extract was concentrated in a rotary evaporator at 40 ℃ and evaporated to dryness by N2-blowing. The residue obtained was dissolved and made up to 2.0 mL with n-hexane-acetone (1+1) solution, which was used for GC-MS analysis. The Agilent HP-5MS (30 m×0.25 mm, 0.25 μm) capillary chromatographic column was used for separation, and the electron impact ionization source with selected ion monitoring (SIM) was adopted in MS. Values of detection limit of 22 pesticides found were in the range of 0.003-0.03 mg·kg-1. On the base of blank sample of cotton fabric, test for recovery was made by standard addition method, values of recovery found were in the range of 80.1%-95.9%, with RSD′s (n=6) less than 13%.