GC Determination of Residual Organophosphorus Pesticides in Tobacoo by Treatment of Samples with Matrix Solid Phase Dispersion

Residual amounts of organophosphorus pesticides in samples of tobacoo were dispersed by matrix sold phase dispersion technique,and eluted with acetone. The extract obtained was concentrated and made up to 1 mL,the solution in acetone was used for GC determination. By using the HP-5 capillary chromatofraphic column,5 organophosphorus pesticides were separated and determinaed by PFPD. The values of detection limit (3S/N) found were in the range of 0.02-0.04 μg·g-1. Precision and recovery of the method were tested,and values of RSD′s (n=5) and of recovery found were in the ranges of 1.1%-3.6% and 89.85%-102.66% respectively.