Dissipation kinetics of emamectin benzoate and lufenuron residues in cabbage grown under field conditions
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Residue analysis of emamectin benzoate and lufenuron in cabbage matrices and soil was developed using a quick, easy, cheap, effective, rugged, and safe (QuEChERS) method and ultra high-performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS). The samples were extracted with 1 % acetic acid in acetonitrile (v/v) or 1 % acetic acid in acetonitrile/water (5:1, v/v) and cleaned up by dispersive solid-phase extraction. Mean recoveries and relative standard deviations (RSDs) in all samples ranged 87.8–100.0 % and 3.6–12.6 % for emamectin benzoate and 87.8–104.8 % and 6.2–11.5 % for lufenuron, respectively. The validated method was used to evaluate the dissipation rate of emamectin benzoate and lufenuron in cabbage and soil as well as the residual levels in harvested cabbage and soil at different preharvest intervals (PHI). The half-lives of emamectin benzoate and lufenuron were 1.08–2.70 and 1.74–5.04 days in cabbage, and 1.42–4.01 and 0.94–6.18 days in soil, respectively. The terminal residues were below the China maximum residue limits (MRLs) at 3 days for emamectin benzoate (0.1 mg kg−1) and European Union MRLs at 5 days for lufenuron (0.5 mg kg−1), which suggested that 5 days could be recommended as the PHI for the commercial formulation of emamectin benzoate and lufenuron application in the Chinese cabbage field.
KeywordsEmamectin benzoate Lufenuron Dissipation Residues Cabbage
The authors acknowledge the Syngenta (China) Investment Co., Ltd. for providing the necessary financial support to accomplish this project.
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Conflict of interest
The authors declare that they have no conflict of interest.
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