GC-MS Determination of Residual Amount of Propiconazole in Foodstuffs with Separation by Solid Phase Extraction

Residual amounts of propiconazole,a bactericide,in foodstuffs of 18 different kinds of matrixes were determined by GC and MS in hyphenation.The sample was extracted with acetonitrile or ethyl acetate according to its variety,and the propiconazole in the extract was purified by passing through C18 SPE column and active carbon column in succession.In the GC-MS analysis,DB-1701 capillary chromatographic column was used for separation,and modes of electron bombardment ionization ion source (EI) and selective ion monitoring (SIM) were adopted for measurement.Linear relationship between values of peak area and mass concentration of propiconazole was kept in the range of 0.02-5.0 mg·L-1,and detection limit (3S/N) of the method was 0.004 mg·kg-1.Test for recovery was made by standard addition method at 3 concentration levels of 0.01 mg·kg-1,0.02 mg·kg-1 and 0.05 mg·kg-1,and the results obtained were in the range of 70% to 115%,with values of RSD′s (n=6) less than 10.2%.