Abstract:

A rapid analytical method based on high-performance liquid chromatography with diode array detection was developed
for the simultaneous determination of imidacloprid and acetamiprid in green tea infusion. The target analytes were extracted with
ethyl acetate-cyclohexane (5:5, V/V), and the extracts were cleaned up by dispersive solid phase extraction with 25 mg of primary
secondary amine (PSA) plus 25 mg of graphitized carbon black (GCB). The recovery rates at three spiked levels of 0.05,
0.1 mg/L and 0.5 mg/L were 93.3% to 102.5% for imidacloprid and 95.0% to 112.7% for acetamiprid, and the relative standard
deviations were 2.2% to 2.9% and 3.0% to 5.1%, respectively. The limits of detection (LOD) of imidacloprid and acetamiprid were
0.004 mg/L and 0.001 mg/L, and the limits of quantification (LOQ) were 0.010 mg/L and 0.006 mg/L, respectively.

Key words: imidacloprid, acetamiprid, green tea infusion, dispersive solid phase extraction, high-performance liquid chromatography (HPLC)