烯唑醇在葡萄和土壤中的残留动态研究

Residue Dynamics of Diniconazol in Grapes and Soil

为了解烯唑醇在葡萄上使用的安全性,采用田间试验的方法,研究了烯唑醇在葡萄和土壤中的残留消解规律和最终残留状况。实验结果表明:在葡萄生长期,12.5%烯唑醇可湿性粉剂按推荐剂量50g·mu-1施药2～3次,距采收期最长21d,烯唑醇在葡萄和土壤中的残留量分别为0.0142mg·kg-1～0.0286mg·kg-1和0.0478mg·kg-1～0.0387mg·kg-1;12.5%烯唑醇可湿性粉剂按推荐2倍剂量100g·mu-1施药2～3次,距采收期最长21d,烯唑醇在葡萄和土壤中的残留量分别为0.0581mg·kg-1～0.0606mg·kg-1和0.0347mg·kg-1～0.0463mg·kg-1。烯唑醇在葡萄和土壤中消解较快,其半衰期分别为5.42d和12.60d,说明该药属易分解农药(T1/2<30d),按推荐剂量使用是安全的。

Diniconazole is a kind of triazoles bactericide. In order to make up standards for safe use of diniconazole on grapes, a supervised trial experiments which used gas chromatography by electron capture detector were conducted to study the residual dynamics of diniconazole in grapes and soil. The method is accurate and the lowest detection limit, which can satisfy the requirement for rapid analysis of diniconazole in samples. The experiment results showed that diniconazole disappeared rapidly from both grapes and soil and then residues in grapes and soil decreased gradually as time went on, Its half-lives in grapes and soil were 5.42 and 13.46 days, respectively, When the diniconazole was sprayed 2 to 3 times at the interval time of 7d- 28d in grapes and soil at application dose of 50g/mu and 100g/mu （that is recommended dose and twice of which, respectively） which was found that the final residues were 0.0142mg · kg^-1 - 0.0606mg · kg^-1 and0.0136mg· kg^-1- 0.0463mg · kg^-1, respectively in grapes and soil. It may be concluded that in consideration of the MRL （0.1 mg. kg^-1） in pears of China, application diniconazole with the recommended dose over the grape growth will cause little problems. So the recommended dose is safe to use and diniconazole belongs to non- persistent （T1/2〈30d） and safe pesticide.