戊唑醇和嘧菌酯在水稻中的消解动态及累积分配特征

    Dissipation, Accumulation and Distribution of Tebuconazol and Azoxystrobin in Oryza sativa

    • 摘要: 利用气相色谱-质谱联用检测技术,建立了戊唑醇和嘧菌酯在水稻(Oryza sativa)地上各部位的残留分析方法;并通过田间试验,研究了戊唑醇和嘧菌酯在水稻植株中的消解行为及在水稻不同部位的残留累积分配特征。在吉林、浙江和广西3地的田间试验结果表明,戊唑醇和嘧菌酯在水稻植株中的残留消解动态规律符合一级动力学方程,在水稻植株中的消解半衰期分别为4.68~5.68 d和4.65~6.08 d。按推荐剂量(以有效成分计)168.8 g•hm-2和1.5倍推荐剂量253.2 g•hm-2在水稻植株上分别喷施750g•L-1戊唑醇•嘧菌酯水分散粒剂2次和3次,戊唑醇和嘧菌酯在水稻各部位的累积分配特征显示,吉林地区2种农药在水稻植株不同部位的残留分配比由大到小依次均为稻壳、茎秆和稻米,浙江和广西地区2种农药在水稻植株各部位的残留分配比由大到小依次为茎秆、稻壳和稻米。

       

      Abstract: Field experiments were conducted in Jilin, Zhejiang and Guangxi provinces for determination of residual tebuconazol and azoxystrobin in tissues of rice (Oryza sativa) using GC-MS and dissipation dynamics, accumulation and distribution of tebuconazol and azoxystrobin in different parts of rice explored. Results show that dissipation dynamics of tebuconazol and azoxystrobin residues in the plants fitted the first-order kinetic equation, and dissipation half-life of tebuconazol and azoxystrobin in the plants was 4.68-5.68 and 4.65-6.08 d, respectively. When 168.8 g•hm-2 (recommended dosage) and 253.2 g•hm-2(1.5 times the recommended dosage) of 750g•L-1 tebuconazol and azoxystrobin water dispersible granules was sprayed twice and thrice, respectively, the accumulation and distribution of tebuconazol and azoxystrobin in tissues of the plants was characterized by the order of husk > straw > rice in Jilin and the order of straw > husk > rice in Zhejiang and Guangxi.

       

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