Residue distribution of mefentrifluconazole in banana and mango fruits
A residual analysis method for mefentrifluconazole in banana and mango was established using ultra high performance liquid chromatography tandem mass spectrometry(UPLC-MS/MS)detection technology.The field trial was conducted in banana and mango at six sites during one year according to NY/T 788-2018 the"Guideline for the Testing of Pesticide Residues in Crops"to study the degradation dynamics and residual distribution of mefentrifluconazole.After the application of the formulation of mefentrifluconazole 400 g/L suspension concentration(SC)on banana and mango crops,fruit samples were extracted with acetonitrile,purified with combined adsorbents of GCB and C18,and analyzed by UPLC-MS/MS.The results showed that at four spiked levels of 0.001-1 mg/kg,the average recovery of mefentrifluconazole in whole banana and flesh was 83％-93％with the relative standard deviation(RSD)2.3％to 5.9％,and the average recovery of mefentrifluconazole in whole mango and flesh was 82％-91％with the RSD 2.9％to 6.0％,respectively;and the limit of quantification(LOQ)was 0.001 mg/kg.The field trials in banana showed that,under the condition of applying mefentrifluconazole 400 g/L SC at dosage of 133.3 mg/kg for 3 times with application interval of 7-10 days,the residues of mefentrifluconazole at 21 and 28 days after the last application were 0.03-0.09 mg/kg in whole banana and<0.001-0.004 mg/kg in the flesh.In the field trials of mango,under the condition of applying mefentrifluconazole 400 g/L SC at dosage of 160 mg/kg for 3 times with application interval of 7-10 days,residues of mefentrifluconazole were 0.04-0.28 mg/kg in whole mango and 0.001-0.003 mg/kg in the flesh at 14 and 21 days after the last application.The research results can provide a reference for guiding the scientific and rational use of mefentrifluconazole in banana and mango,as well as for the establishment of its maximum residue limit(MRL)values.
国家科技期刊平台
NSTL
万方数据
维普
