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题名: 己唑醇在黄瓜及土壤中的残留动态研究
作者: 袁蕾
学位类别: 硕士
答辩日期: 2010
授予单位: 中国科学院研究生院
授予地点: 北京
导师: 李建中
中文摘要:       己唑醇是一类重要的唑类杀菌剂,甾醇脱甲基化抑制剂,对真菌尤其是担子菌门和子囊菌门引起的病害有广谱性的保护和治疗作用。它能够破坏和阻止病菌的细胞膜重要组成成分麦角甾醇的生物合成,导致细胞膜不能形成,进而使病菌死亡。己唑醇对黄瓜白粉病有很好的防治效果。 本研究的目的在于建立一种检测黄瓜及土壤中己唑醇的气相色谱分析方法,并通过田间试验研究己唑醇在黄瓜及土壤中的消解动态、确定其半衰期,测定其在黄瓜及土壤中的最终残留,为该农药在黄瓜上的安全使用提供依据。 本文建立了简单、灵敏、高效的己唑醇气相色谱检测方法。在0.005~0.05mg/kg添加浓度范围内,己唑醇在黄瓜中的平均回收率为91.0%~95.8%,相对标准偏差为2.9%~3.6%;在土壤中的平均回收率为91.6%~92.6%,相对标准偏差为1.2%~4.2%。最小检出浓度(LOD)为0.0012mg/kg(S/N=3),最小检出量(LOQ)为0.012 ng。 己唑醇在黄瓜中消解动态试验结果表明,其在黄瓜中的消解过程符合一级动力学规律,在25.00、37.50、56.25克有效成分/公顷三个施药浓度下己唑醇在黄瓜中的半衰期分别为2.5、2.2和2.2天;在施药浓度为56.25克有效成分/公顷时,北京、安徽、海南三地己唑醇在黄瓜中的半衰期分别为2.2、2.4和2.1天。 己唑醇在土壤中消解动态试验结果表明,其在土壤中的消解过程符合一级动力学规律,在25.00、37.50、56.25克有效成分/公顷三个施药浓度下己唑醇在土壤中的半衰期分别为18.6、18.8和17.8天;在施药浓度为56.25克有效成分/公顷时,北京、安徽、海南三地己唑醇在土壤中的半衰期分别为17.8、15.3和14.9天。 最终残留试验结果表明,末次施药后3天黄瓜中的残留量为<0.0012~0.0391mg/kg,低于MRL0.05mg/kg,因此建议己唑醇在黄瓜上使用的安全间隔期为3d。
英文摘要:       Hexaconazole, a member of the class of triazole fungicides, is highly active and has a broad spectrum of action against basidiomycetes and ascomycetes as an interference with fungal sterol synthesis. It resists the formation of cell membrane through destroy and prevent the biosynthesis of the key element-ergosterol, and at last lead to the death of germs. The research aimed at the establishment of a simple, sensitive and effective method for the determination of hexaconazole residues in cucumber and soil samples. In order to provide criteria for safe application of hexaconazole in cucumber, field experiments were conducted to study the dissipation rates and residue levels of hexaconazole in cucumber and soil. A method has been developed for the quantification of hexaconazole residues in cucumber and soil. In fortified level of 0.005~0.05mg/kg, average recoveries of hexaconazole in cucumber through the method ranged between 91.0%~95.8% with RSD equal or lower than 3.6%; average recoveries and RSD of in soil were 91.6%~92.6% and 1.2%~4.2%. The limit of detection (LOD) was estimated to be 0.0012mg/kg and the minimum quantification concentration of hexaconazole in cucumber (LOQ) was 0.012 ng. Dissipation study showed that the half life of hexaconazole in cucumber applied at three different concentrations, 25.00、37.50 and 56.25 g(a.i.)/ha, were 2.5、2.2 and 2.2d respectively. At the application rate of 56.25 g(a.i.)/ha, the half life of hexaconazole in cucumber was 2.2、2.4 and 2.1d respectively in Beijing, Anhui and Hainan. Dissipation study showed that the half life of hexaconazole in soil applied at three different concentrations, 25.00、37.50、56.25 g(a.i.)/ha, were 18.6、18.8 and 17.8d respectively. At the application rate of 56.25 g(a.i.)/ha, the half life of hexaconazole in cucumber was 17.8、15.3 and 14.9d respectively in Beijing, Anhui and Hainan. Results of field experiments showed that the level of hexaconazole residues in cucumber was <0.0012~0.0391mg/kg 3d after the last spray, which was lower than the MRL of 0.05 mg/kg, therefore we recommended a PHI of 3d for the use of hexaconazole in cucumber.
内容类型: 学位论文
URI标识: http://ir.rcees.ac.cn/handle/311016/35034
Appears in Collections:中科院环境生物技术重点实验室_学位论文

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Recommended Citation:
袁蕾. 己唑醇在黄瓜及土壤中的残留动态研究[D]. 北京. 中国科学院研究生院. 2010.
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