ABSTRACT
The aim of this work was to establish a method to determine and quantify the residues of imidacloprid, carbendazim and acetamiprid in dried longans by performing HPLC. Acetonitrile was added to the sample as an extraction solvent, and by using sodium chloride for absorbing water from the samples that were then purified by using a NH2 solid phase extraction cartridge, the sample was detected by HPLC. Under the selected conditions, the detection limits of imidacloprid, carbendazim, acetamiprid were 0.005 mg/kg, 0.007 mg/kg, and 0.005 mg/kg, respectively. Tests for recovery were made by addition of three pesticides’ standards at three different concentration levels (0.05, 0.2 and 1.0 mg/kg) to the blank sample. The mean recovery rates of imidacloprid, carbendazim, and acetamiprid were 83.0%~9.6%, 85.0%~98.0%, and 86.0%~97.0%, respectively and the relative standard deviation was 0.35%~4.50%. The sensitivity, accuracy, and precision of this method were able to meet the requirements for pesticide residue analysis.
