摘要
[目的]了解氟啶虫酰胺的环境行为规律,为氟啶虫酰胺的合理使用及环境风险评估提供参考。[方法]采用室内模拟试验方法,研究氟啶虫酰胺在不同p H值(4、7、9),溶剂(乙酸乙酯、丙酮、水、乙腈)和Fe3+质量浓度(0、1、5、10 mg/L)溶液中的光解特性以及氟啶虫酰胺在不同pH值和温度下的水解特性。[结果]在500 W汞灯的照射下,氟啶虫酰胺的光解符合一级动力学方程。氟啶虫酰胺在pH值4、7、9缓冲溶液中的光解半衰期15.4、44.2、63.8 min;氟啶虫酰胺在乙酸乙酯、丙酮、水和乙腈中的光解半衰期为2.1、8.6、28.0、32.4 min;氟啶虫酰胺在添加质量浓度为0、1、5、10 mg/L的Fe^(3+)溶液中的光解半衰期为28.0、47.1、52.3、36.9 min。氟啶虫酰胺在pH值4、7缓冲溶液中水解缓慢,但在碱性溶液中其水解速率加快。温度为25、35、50℃时氟啶虫酰胺在pH值9缓冲溶液中的水解半衰期分别为204、74、12 d,水解速率随温度的升高而加快。[结论]酸性条件促进氟啶虫酰胺的光解,碱性条件抑制氟啶虫酰胺的光解;乙酸乙酯和丙酮促进氟啶虫酰胺的光解;溶液中添加Fe3+会抑制氟啶虫酰胺的光解。高温碱性条件利于氟啶虫酰胺的水解。采用HPLC-MS/MS对氟啶虫酰胺的水解产物进行了分析,并验证了水解产物中含有TFNG[N-(4-三氟甲基烟酰)甘氨酸]。
[Aims] This study aims to learn about the environmental behavior of flonicamid and to provide reference for the rational use and environmental risk assessment of flonicamid. [Methods] The photolysis characteristics of flonicamid in solutions with different pH(4, 7, 9), solvents(ethyl acetate, acetone, water, acetonitrile) and Fe3+concentrations(0, 1, 5, 10 mg/L) and the hydrolysis characteristics of flonicamid at different pH and temperatures were studied by laboratory simulation test. [Results] Under the irradiation of 500 W mercury lamp, the photolysis of flonicamid accords with the first-order kinetic equation. The photolysis half-lives of flonicamid in buffer solutions with pH values of 4, 7, 9 were 15.4, 44.2 and 63.8 min. The photolysis half-lives of flonicamid in ethyl acetate, acetone,water and acetonitrile were 2.1, 8.6, 28.0 and 32.4 min. The photolysis half-lives of flonicamid in solution with Fe3+concentration of 0, 1, 5, 10 mg/L were 28.0, 47.1, 52.3 and 36.9 min. The hydrolysis rate of flonicamid in the solution of pH 4 and 7 was slow, but increased in basic solution. The hydrolysis half-life of flonicamid in pH 9 buffer solution at25, 35 and 50 ℃ was 204, 74 and 12 d, respectively, and the rate of hydrolysis increased with increasing temperature.[Conclusions] The acid condition promoted the photolysis of flonicamid, while the alkaline condition inhibited the photolysis of flonicamid. Ethyl acetate and acetone promoted the photolysis of flonicamid. The photolysis of flonicamid was inhibited by the addition of Fe3+ to the solution. High temperature and alkaline conditions facilitated the hydrolysis of flonicamid. The hydrolysis product of flonicamid was analyzed using HPLC-MS/MS and the hydrolysis product was verified to contain TFNG [N-(4-trifluorom-ethylnicotinoyl) glycine].
作者
吕珍珍
郭南
侯新港
曹战文
侯胜楠
张晟
樊雨鑫
逯忠斌
侯志广
LYU Zhen-zhen;GUO Nan;HOU Xin-gang;CAO Zhan-wen;HOU Sheng-nan;ZHANG Sheng;Fan Yu-xin;LU Zhong-bin;HOU Zhi-guang(College of Plant Protection,Jilin Agricultural University,Changchun 130118,China)
出处
《农药》
CAS
CSCD
北大核心
2022年第6期428-433,共6页
Agrochemicals
基金
农业农村部东北植物营养与农业环境重点实验室开放基金课题(KLAE201802-02)
农业部行业标准制双炔酰菌胺在人参中的残留限量标准(14202008)项目资助。
关键词
氟啶虫酰胺
光解
水解
flonicamid
photolysis
hydrolysis
