Determination of 18 Organic Phosphorus and Pyrthroid Pesticides in Dried Vegetables using Solid-phase Extraction and On-line Gel Permeation Chromatography-GC/MS
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Abstract:
An on-line gel permeation chromatography-GC/MS analytical method was developed for the determination of 18 organic phosphorus pesticide and pyrethroid pesticides in dried vegetables.The samples were extracted with acetonitrile by means of ultrasonic high-speed homogenization, cleaned up by an ENVI-Carb solid phase extraction column to remove pigment in the sample and analyzed by on-line gel permeation chromatography-GC/MS. All the compounds demonstrated good linear relationship in the range of 0.02~0.5 mg/kg. The recoveries for the most of pestive standards of 0.4 mg/kg were 80%-130% and the relative standard deviations were less than 10%. The limits of detection were from 0.001 mg/kg to 0.026 mg/kg. The method was rapid, accurate and highly sensitive, which can be used for the simultaneous determination of pesticide residues in dried vegetables.
