GC-MS Determination of Volatile Organic Compounds on the Surface of Crop Seeds with Purge and Trap Collector

Gas chromatography in hyphenation with mass spectrometry was applied to the determination of volatile organic compounds (VOC′s) on the surface of crop seeds.The analytes were purge-trapped,thermodesorbed,and determined by GC-MS.Internal standard was adopted in the determination.Linear relationships between values of peak area and mass concentration of 5 kinds of VOC′s,including dichloromethane,1,2-dichloroethane,chloro-benezene,1,2,4-trichlorobenzene and naphthalene,were obtained in definite ranges,with detection limits (3s) in the range of 0.20-0.40 μg·kg-1.Tests for recovery and precision were made by standard addition method,values of recovery found were in the range of 86.5%-96.3% and values of RSD′s (n=7) were less than 5.5%.