Determination of residues of cyantraniliprole and its metabolite J9Z38 in watermelon and soil using ultra-performance liquid chromatography/mass spectrometry.

A method was developed for the determination of cyantraniliprole (HGW86) and its metabolite J9Z38 in watermelon and soil by ultra-performance LC (UPLC)/MS/MS. Target compounds were extracted by acetonitrile-water, cleaned up on a silica gel column, and determined by UPLC/MS/MS. Average recoveries of cyantraniliprole and J9Z38 in watermelon and soil at three levels (0.01, 0.1, and 0.5 mg/kg) ranged from 85.71 to 105.74%, with RSDs of 0.90-6.34%. The LOQs for cyantraniliprole and J9Z38 were determined to be 0.00021, 0.00015, 0.0010, and 0.00090 mg/kg in watermelon and soil samples, respectively. This method was used to determine the cyantraniliprole and J9Z38 residues in watermelon and soil samples for studies on their dissipation. The trial results showed that the half-lives of cyantraniliprole obtained after treatments were 1.1 and 4.1 days in watermelon and soil in Zhejiang, and 2.7 and 2.6 days in watermelon and soil in Hunan, respectively. The average levels of cyantraniliprole and J9Z38 residues in watermelon and soil were all < 0.01 mg/kg within the 14-day interval after treatment.