Determination of Organochlorine Pesticides in Saposhnikovia Divaricate by Ultrasonic-Assisted Extraction Coupled with GC-ECD

摘要

A simple, rapid, and sensitive method for determination of organochlorine pesticides in Saposhnikovia divaricata by ultrasonic-assisted extraction coupled with GC-ECD was developed and validated. The extracting agent was a mixture solvent of acetone-methylene chloride (1 + 1). The extracts were cleaned up with concentrated sulfuric acid as sulfonating agent. The samples were separated by the capillary column HP-5. 6 organochlorine pesticides in Saposhnikovia divaricata were determined by gas chromatography with an electron capture detector (GC-ECD) simultaneously. 6 pesticides reference substances had good linear relationship in the concentration range of 8-150 ng/g. The average recoveries were, respectively, 83.5-97.3 %, 84.4-99.7 %, and 89.9-98.7 % at three added levels of 15, 30, and 60 ng/g. Relative standard deviation (RSD) was, respectively, 3.0-7.3 %, 4.6-7.4 %, and 3.9-8.7 %. The method was simple, rapid, and high selectivity. It was suitable for determination of organochlorine pesticides in Saposhnikovia divaricata.