浙江农业科学

浙江农业科学 ›› 2025, Vol. 66 ›› Issue (7): 1686-1690.DOI: 10.16178/j.issn.0528-9017.20240656

• 植保技术 • 上一篇    下一篇

新型杀螺剂吡螺脲的水解特性及其在水-沉积物系统中的降解行为研究

吴欢琪1(), 杨孔谈1, 王许蜜1, 方楠1, 段李平2, 张昌朋1, 王祥云1,*()   

  1. 1.浙江省农业科学院 农产品质量安全与营养研究所,浙江 杭州 310021
    2.中国疾病预防控制中心 寄生虫病预防控制所, 上海 200025
  • 收稿日期:2024-08-14 出版日期:2025-07-11 发布日期:2025-07-28
  • 通讯作者: 王祥云(1983—),男,浙江金华人,副研究员,博士,从事农药残留与农产品安全研究,E-mail: wangxy@zaas.ac.cn。
  • 作者简介:吴欢琪(1998—),女,安徽安庆人,硕士,研究方向为农药残留与农产品安全,E-mail: wuhuanqi2023@163.com。
  • 基金资助:
    国家自然科学基金面上项目(82072309)

Study on the hydrolysis characteristics of the new molluscicide pyriclobenzuron and its degradation characteristics in water-sediment system

WU Huanqi1(), YANG Kongtan1, WANG Xumi1, FANG Nan1, DUAN Liping2, ZHANG Changpeng1, WANG Xiangyun1,*()   

  1. 1. Institute of Agro-Products Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, Zhejiang
    2. National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention,Shanghai 200025
  • Received:2024-08-14 Online:2025-07-11 Published:2025-07-28

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摘要：

为了评价新型杀螺剂吡螺脲的环境安全性,根据国家标准GB/T 31270—2014在实验室条件下研究室温(25 ℃)下吡螺脲在不同pH值缓冲溶液中的水解特性,以及在2种水-沉积物系统中的降解特性。结果表明:室温条件下,吡螺脲在pH值为6.58、9.10、12.13的缓冲溶液中的水解半衰期大于180.00 d,为难降解农药。在pH值为4.15的缓冲溶液中吡螺脲的水解半衰期为13.86 d,小于30.00 d,属于易降解农药。吡螺脲在绍兴和嘉善的2种水-沉积物系统水相中的降解趋势可拟合一级动力学方程,其好氧降解半衰期分别为7.53和7.79 d。水相中吡螺脲逐渐迁移至沉积物中,并在一段时间内检出浓度基本稳定。综上所述,吡螺脲在避光的中性和碱性水环境中难降解,在酸性水环境中易降解,在室温条件下水-沉积物系统的水相中吡螺脲属于易降解农药。因此,吡螺脲的环境风险较小,有望在实际稻田环境中施用以防治螺害。

关键词: 吡螺脲, 杀螺剂, 水-沉积物系统, 水解

Abstract:

To evaluate the environmental safety of the new molluscicide pyriclobenzuron, the hydrolysis characteristics of pyriclobenzuron at room temperature (25 ℃) and in buffer solutions with different pH values, as well as its degradation characteristics in two water-sediment systems, were studied under laboratory conditions according to national standards (GB/T 31270—2014). The hydrolysis half-life of pyriclobenzuron in buffer solutions with pH values of 6.58, 9.10 and 12.13 was greater than 180.00 d, belonging to difficultly degradable pesticides. In a buffer solution with a pH value of 4.15, the hydrolysis half-life of pyriclobenzuron was 13.86 d, which was less than 30.00 d, belonging to easily degradable pesticides. Besides, the degradation of pyriclobenzuron in the Shaoxing and Jiashan water-sediment systems followed a first-order kinetic equation. The aerobic degradation half-lives of pyriclobenzuron in aqueous phase were 7.53 and 7.79 d, respectively. Pyriclobenzuron gradually migrated from the aqueous phase to the sediment, and the detected concentration of pyriclobenzuron in the sediment remained relatively stable over a period of time. In summary, pyriclobenzuron was difficult to degrade in neutral and alkaline water environments under dark conditions, while it belonged to easily degradable pesticides in acidic water environments. Pyriclobenzuron belonged to easily degradable pesticides in two water-sediment systems at 25 ℃. In conclusion, it is expected to be used for the prevention and control of Pomacea canaliculate in actual rice paddy environments with less environment risk.

Key words: pyriclobenzuron, molluscicide, water-sediment system, hydrolysis

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