Determination of Organochlorine Pesticides in Tea Beverage by Directly Suspended Droplet Microextraction Combined with GC-ECD

In this paper, a simple and efficient directly suspended droplet microextraction (DSDME) method has been developed and optimized, which can be applied on extracting organochlorine pesticides (OCPs) in beverage for gas chromatography-electron capture detector (GC-ECD) analysis. The optimal DSDME was adding 100 mu L of isooctane into 5 mL of the beverage sample and stirred for 10 min at 1,000 rpm. The relative recoveries of the DSDME method were ranged from 81 to 117 % (relative standard deviations were 2-20 %, n = 5). The limits of detections were 0.8-5.0 ng/L. Furthermore, DSDME was applied to rapidly determine the OCPs in tea beverage and the results suggested that the method can be used as rapid determination of OCPs in the tea beverage.