| The method on determination of cyhalothrin pesticide residues by capillary GC in apple was established,and the cyhalothrin residues in apple were determined by the method.The residues were extracted from apple with acetonitrile which substitute the mixture of acetone and petroleum ether,and the extraction solution had little impurity and was comparatively clean,decontaminated with Florisil,and determined by GC with electron capture detector,the step of preparation was simplified,and the method reduced solvent consumption,saving time,as well.The method of infilling glass cotton in glass inner tube avoided the disturbance of chromatography peak and impurity peak which because reverse pervasion and adsorption of sample vapor and septum lose.The recoveries of the three spiked levels of cyhalothrin were from 92.54%±2.3% to 103.32%±4.4% in whole apple,from 96.00%±2.8% to 101.23%±2.9% in apple peel and from 92.50%±3.6% to 104.02%±2.9% in apple pulp.The minimum detection limits of cyhalothrin were 5.70×10-11 g. It was a sensitive,simple and reliable method to determine the residues of cyhalothrin in apple,the result of recovery rate and coefficient of variation and minimum detection limits were famous. |