Abstract:

In this study，a rapid method has been developed for the determination of germicide EBDCs residues in fruits. The EBDCs of fruits sample，which was methylated by methyl iodide（CH3I），was extracted by the Quick，Easy，Cheap，Effective，Rugged and Safe method（QuEChERS）and detected by ultra performance liquid chromatography–mass spectrometry under multiple reaction monitoring mode，then quantified by matrix-match standard solution. The qualitative results were obtained based on the characteristic m/z 241.1/117.1 ion and m/z 241.1/193.0 ion. The quantitation results were on the intension of the characteristic m/z 241.1/134.0 ion. The results show that the derivative of Maneb，Zineb，Mancozeb，Disodium and Metiram have different matrix effect in different fruits and good linearity in the ranges of 0.005–1.000 mg · kg^-1（in CS₂），and the correlation are between 0.9948 and 0.9996. The recoveries for apple，peach，grape，citrus and banana samples at the different fortified levels ranged from 82.6% to 98.8% with relative standard deviations（RSD）of 0.7%–8.8%. Limits of detection of EBDCs were 0.6–1.0 µg · kg^-1（in CS₂），while limits of quantification were 10 µg · kg^-1（in CS₂）. The method is simple，rapid，and accurate，and can meet the requirements of the domestic and international legislation.

Key words: friut, dispersion solid phase extraction, ultra performance liquid chromatography–mass spectrometry, ethylenebisdithiocarbamates, residue