The dissipation rates of myclobutanil and residue analysis in wheat and soil using gas chromatography-ion trap mass spectrometry
文献类型: 外文期刊
第一作者: Dong, Fengshou
作者: Dong, Fengshou;Wang, Xu;Zheng, Yongquan
作者机构:
关键词: fungicide residue;dissipation;gas chromatography-ion trap mass spectrometry;myclobutanil;wheat;soil
期刊名称:INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY ( 影响因子:2.826; 五年影响因子:2.215 )
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收录情况: SCI
摘要: The dissipation of myclobutanil (triazole fungicide) in wheat plant, grain and soil under the local weather and soil conditions was studied and fungicide residues were determined by GC-1TMS. Myclobutanil (25% EC) was applied at two dosages, 60 g a.i. ha~(-1) (recommended) and 120 g a.i. ha~(-1) (2 times of the recommended dosage) in the experimental fields in Shandong, Beijing and Henan provinces (experimental localities). The detection limit (LOD) and the limit of quantification (LOQ) of myclobutanil were 0.6 μg kg~(-1) and 2 μg kg~(-1) respectively, and they were much below the maximum residue limit (MRL 0.02 mg kg~(-1)) in the EU. The average recoveries were 76.4-97.7, 82.6-92.6 and 75.0-94.4% with relative standard deviation (RSD) of 6.3-15.9, 3.8-17.3 and 3.0-19.7% in wheat plant at four spiking levels (0.01,0.1,0.5, 10mg kg~(-1)), wheat grain at four spiking levels (0.005,0.01,0.1, 10mg kg~(-1)) and soil at five spiking levels (0.002,0.01,0.1,0.5, 10mg kg~(-1)), respectively. The results showed that the half-lives of myclobutanil in wheat plant and soil from Shandong, Beijing and Henan were 3.5-4.5 and 11.0-11.7 days, respectively. At harvest, wheat grain samples were found to contain myclobutanil well below the MRL following the recommended dosage and the interval of 20 days after last application.
分类号: X
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