Abstract
A high-performance liquid chromatography-tandem mass spectrometry method was developed for the determination of cyazofamid and its major metabolite 4-Chloro-5-(4-tolyl)-1H-imidazole-2-carbonitrile (CCIM) in oily samples. Samples were extracted with acetonitrile, which contained 1% acetic acid and cleaned-up with C18 and Florisil absorbents. Recoveries ranged from 75.91% to 109.85% with coefficients of variation from 5.14% to 10.69%. The limits of detection (LODs) and the limits of quantification (LOQs) were >0.0020mgkg-1 and ≤0.0040 mg·kg-1, respectively, which were smaller than maximum residue levels established by Australia for oily samples. The proposed fragmentation pathway of cyazofamid and CCIM were discussed.
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