Abstract
The dissipation and residue of myclobutanil in lychee under field conditions were studied. To determine myclobutanil residue in samples, an analytical method with a florisil column clean-up and detected by gas chromatography-electron capture detector (GC-ECD) was developed. Recoveries were found in the range of 83.24 %-89.00 % with relative standard deviations of 2.67 %-9.88 %. This method was successfully applied to analyze the dissipation and residue of myclobutanil in lychee in Guangdong and Guangxi Province, China. The half lives in lychee were from 2.2 to 3.4 days. The residues of myclobutanil in lychee flesh were all below the limit of quantification (LOQ) value (0.01 mg/kg), and most of the residues were concentrated in the peel. The terminal residues of myclobutanil were all bellow the maximum residue limit (MRL) value set by European Union (EU) (0.02 mg/kg). Hence it was safe for the use of this pesticide and the results also could give a reference for MRL setting of myclobutanil in lychee in China.
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