Degradation Dynamics and Residue Analysis of Flubendiamide in Cabbage and Soil by Liquid Chromatography-Tandem Mass Spectrometry with Dispersive Solid Phase Extraction

Xiaojun Chen, Ping Wang, Zhiyuan Meng, Si Chen, Haotian Gu, Xiaoling Sha

School of Horticulture and Plant Protection, Yangzhou University, Yangzhou, China.

DOI: 10.4236/as.2014.510091                

Abstract

To formulate a scientific basis for a reasonable spray dose and safe interval period of 20% flubendiamide water dispersible granule (WDG) on controlling vegetable pests, degradation dynamics of flubendiamide in cabbage and soil was analyzed in this study. Dissipation and residue of flubendiamide in 20% flubendiamide WDG in cabbage and soil under field conditions were investigated by liquid chromatography-tandem mass spectrometry with dispersive solid phase extraction. Results showed that the degradation dynamic equations of flubendiamide in cabbage and soil were based on the first-order reaction dynamic equations. The half-lives of the degradation of flubendiamide were 3.51 d to 3.96 d and 3.43 d to 3.87 d in the cabbage of Yangzhou and Jingzhou, respectively, and 4.42 d to 5.13 d and 4.37 d to 4.99 d in the soil of Yangzhou and Jingzhou, respectively. The terminal residues of flubendiamide in the cabbage of Yangzhou and Jingzhou were 0.0247 mg·kg^-1 to 0.0393 mg·kg^-1 and 0.0225 mg·kg^-1 to 0.0273 mg·kg^-1, respectively, when 20% flubendiamide WDG was applied at a dose of0.050g·m^-2. Flubendiamide is safe to be applied in cabbage fields at the recommended dose.

Keywords

Flubendiamide, Dispersive Solid Phase Extraction, LC-MS/MS, Degradation, Residue

Conflicts of Interest

The authors declare no conflicts of interest.

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