Feiming You¹, Fang Wu², Wanping Lu², Qing Zhang², Lan Zhang²

(1 Fujian Inspection and Research Institute for Product Quality, Fuzhou 350002; 2 Instrumentation Analysis and Measurement Center of Fuzhou University, Fuzhou 350002)

Abstract: A method for the determination of 16 organophosphorus pesticide residues in tea by GC-NPD with ultrasonic extraction was established. Tea samples were extracted with 10 mL of  acetone, and then cleaned by homemade PSA/activated carbon SPE cartridge and eluted with acetonitrile-toluene (1:3, V/V). 16 organophosphorus pesticides were well separated and detected with high repeatability and precision. The recovery rate of the method was between 62.8% and 109.1%. The relative standard deviation was less than 14.7%. The limit of detection of 16 organophosphorus was between 0.01 mg/kg and 0.16 mg/kg. The method is reliable rapid and is, suitable for the analysis of pesticide residues in real samples.

Key words: organophosphorus, pesticide residue, SPE, gas chromatography, tea

E-mail: zlan@fzu.edu.cn

Analysis and Testing Technology and Instruments, Vol. 17, No. 1, 2011, 6-10.