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Difenoeonazole,which is a new compound of triazole fungicides,has been manufactured and developed by Syngenta.Pure sample is achromatous solid.Its melting point is 76℃.The compoud is not soluble in water,but it can be easily dissolve in a majority of organic solvent.Difenoeonazole not only has high efficiency and broad spectrum,but also is low toxicity to mammal.The contents and results are as follows:1.This article discussed about the residue analysis means of difenoeonazole in banana,litchi and soil.The analysis method for determination of difenoeonazole by GC was established.The limit of quantification was 0.02mg/kg.The limit of detection was 2.0×1010g in banana,litchi and soil.When concentration ranged from 0.02mg/kg to 2mg/kg of difenoeonazole,the average recovery in banana,litchi,soil sample of banana and soil sample of litchi was 83.80%～96.01%,87.35%～93.38%,94.00%～97.27%and 85.90%～92.80%,separately.At the same time,the relation standard deviation（RSD） was 3.98%～6.11%,4.51%～9.88%,2.76%～5.32%and 5.58%～9.94 %,respectively.The sensitivity and accuracy and precision of the means was accorded with the demand of the detection skill of pesticide residue.2.The thesis was considered with the dissipation dynamics of difenoeonazole 37%water dispersible granule in banana,litchi and soil.Its result showed that the dissipation dynamics of fungicides was accoreded with C=C0E-kt in banana,litchi and soil.Moreover it had high correlation.The half-life of difenoeonazole in banana was 10.18d in HaiKou and 9.86d in NanNing.The half-life of difenoeonazole in litchi was 11.27d and 8.61d in HaiKou and NanNing,respectively.The half-life of difenoeonazole in soil ranged from 11.71d to 22.5d in HaiKou and NanNing.The results of dynamic residue of difenoeonazole in banana were accord with minus exponential equation:HaiKou C=2.9162e-0.0681t,r=0.9592,NanNing C=2.7262e-0.0703t, r=0.9199.The results of dynamic residue of difenoeonazole in litchi were accord with minus exponential equation:Halkou C=1.0613e-0.0615t,r=0.9892,Nanning C=0.9992e-0.0805t,r=0.9877.The results of dynamic residue of difenoeonazole in soil sample of banana were accord with minus exponential equation:Haikou C=2.7737e-0.0308t,r=0.9592,Nanning C=3.4468e-0.0454t,r=0.9917.The results of dynamic residue of difenoeonazole in soil sample of litchi were accord with minus exponential equation:Haikou C=0.2613e-0.0592t,r=0.9718.Nanning C=0.4326e-0.0512t, r=0.9796.3.The paper reported the final residue experiment of difenoeonazole in banana,litchi and soil.The outcome indicated that it is recommended that the pre-harvest interval of difenoeonazole in banana is 15 days for the 123.3 mg/L treatment,and in litchi is 7 days for 225 mg/L treatment,respectively.The residue of difenoeonazole was directly related to the applying concentration and degree.Namely,the residue increased in pace of them.
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