Residue and Dissipation of Spirotetramat and Its Metabolites in Kiwifruits and Soil
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Abstract:
This paper developed a rapid method for analyzing the spirotetramat and its four major metabolites residues in kiwifruits and soil. Samples were extracted with acetonitrile, cleaned up by Solid Phase Extraction PSA and detected by using high performance liquid chromatography-tandem mass spectrometry. Average recoveries of spirotetramat and its four major metabolites fortified at 0.01~2.00 mg/kg in kiwifruits and soil ranged from 73.97%~110.52% with the relative standard deviations (RSD) of 1.96%~7.91%, respectively. Using the above method, residue dissipation of spirotetramat and its metabolites in kiwifruits and soil were detected. After spirotetramat is applied to the soil and kiwi, it was rapidly degraded as B-enol, B-keto. In the kiwifruit, the spirotetramat and B-enol gradually decreased, while the B-keto and B-mono showed a gradual increase. In the soil, spirotetramat, B-enol and B-keto showed a decreasing trend, and B-mono and B-glu were not detected in the samples. The degradation rates of spirotetramat and B-enol in soil (1.42 d and 1.99 d, respectively) were faster than those on kiwifruit (4.08 d and 6.39 d, respectively). Sprayed twice with 3000 times liquid dilution, after 28 days, the residual amount of spirotetramat in kiwifruit was 0.06 mg/kg, which was higher than the maximum residue limit of 0.02 mg/kg formulated in China, the safe use of kiwifruit requires further study.
