Determination of oxathiapiprolin concentration and dissipation in grapes and soil by UPLC-MS/MS

发布时间：2020年03月18日 20:17　　浏览次数：1016

Pingzhong Yu*,Chunhong Jia,Ercheng Zhao, Li Chen, Hongju He,Junjie Jing,Min He

The residue concentrations and dissipation rate of a new oxathiapiprolin fungicide in grapes and soil wereinvestigated to provide an evaluation for the safe use of oxathiapiprolin in grapes. Pesticide residue was extracted byacetonitrile, then purified by solid-phase extraction with an Envi-Carb cartridge and determined by ultrahigh-performance liquid chromatography–tandemmass spectrometry. The fortified recoveries ranged from 85.2% to 99.0%, with relative standard deviations of 1.7–4.5%. The limit of quantitation for oxathiapiprolin in grapes and soil was 0.002mgkg−1. The mean initial deposits of oxathiapiprolin in grapes were 0.345–0.565mgkg−1, with half-lives of 8.6–9.2 days. The mean initial deposits of oxathiapiprolin in soil were 0.078–0.273mgkg−1, with half-lives of 7.6–12.0 days. The oxathiapiprolin residue in grapes and soil was 0.002–0.022mgkg−1 and 0.002–0.123mgkg−1 when sampling 14 days after application, respectively. The residue in the grapes was less than 0.01mg kg−1 when sampling 28 days after application, which suggested that the application rate of 20mg a.i. kg−1 for this fungicide should be used to ensure that treated grapes can be considered safe for humans to consume when sampling 28 days after the final application.

J Sci Food Agric，2017; 97: 3294–3299.