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  • Title: Simultaneous determination of imazalil and its major metabolite in citrus fruit by solid-phase extraction and capillary gas chromatography with electron capture detection.
    Author: Matsumoto H.
    Journal: J AOAC Int; 2001; 84(2):546-50. PubMed ID: 11324623.
    Abstract:
    A method was developed for the simultaneous determination of imazalil and its major metabolite, R 14821, in citrus fruit. This method (designated the SPE method) is based on solid-phase extraction (SPE) and capillary gas chromatography (GC) with electron-capture detection (ECD). The SPE method is highly sensitive for both compounds (limit of detection for each: 0.001 microg/g) and is less time consuming than the previously reported method based on repeated liquid-liquid partitioning and GC-ECD. Recoveries for 3 levels of fortification (0.02, 0.2, and 2.5 microg/g) from satsuma mandarins ranged from 94.3 to 96.5% for imazalil and from 93.9 to 96.3 % for R 14821, with coefficients of variation (CVs) ranging from 3.1 to 6.3% for imazalil and from 4.5 to 5.6% for R 14821. Average residual levels found in grapefruit, oranges, and lemons by the SPE method and the previously reported method, and the corresponding CVs, were similar.
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