›› 2010, Vol. 22 ›› Issue (4): 0-490.

• 论文 •    

草铵膦在水中的降解特性及对水生生物的毒性

牛立志,桂文君,朱国念*   

  1. 浙江大学 农药与环境毒理研究所,杭州 310029
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2010-07-25 发布日期:2010-07-25

The degradation of glufosinate in water and toxicity to aquatic organism

NIU Li-zhi;GUI Wen-jun;ZHU Guo-nian*   

  1. Institute of Pesticide and Environmental Toxicology,Zhejiang University,Hangzhou 310029,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2010-07-25 Published:2010-07-25

摘要: 为评价除草剂草铵膦在水中的化学行为特征及其对水生生物的毒性,采用UPLC-MS/MS等手段,研究了草铵膦在不同pH值、不同温度条件下的水解特性和不同光强、不同波长下的光解特性,以及对水生生物的急性毒性。结果表明,草铵膦在pH 5.0,6.9,9.3缓冲溶液中的半衰期分别为433,693,533 d,在弱酸和弱碱条件下均能稳定存在。温度对草铵膦的水解影响显著,温度升高,水解速率加快。草铵膦在4 500 lx和8 300 lx氙灯下的半衰期分别为1 155和866 h;360和254 nm波长紫外光光照处理下的半衰期分别为462和40 h,光强和波长对草铵膦的水中光解影响明显;草铵膦对小球藻 (Chlorella vulgarrs)、大型溞 (Daphnia magna)和斑马鱼 (Brachydonio rerio)的EC50/LC50均大于100 mg/L,均为低毒。

关键词: 草铵膦, 水解, 光解, 水生生物, 生态毒性

Abstract: To evaluate the chemical behavior of glufosinate in water, as well as its toxicity to aquatic organism, the hydrolysis properties at different temperatures and different pH values, the photolysis characteristics in water under different light intensity and wavelength, and the acute toxicity to aquatic organism were investigated using UPLC-MS/MS. The results showed that the half life of glufosinate in three buffer solutions with pH values of 5.0, 6.9 and 9.3 was 433, 693 and 533 d, respectively. It was indicated that glufosinate was stable in slightly alkaline and acidic condition. The degradation of glufosinate was positively related to the temperature. The half lives of photolysis of glufosinate under 4 500 and 8 300 lx were 1 155 and 866 h respectively, while under 365 and 254 nm were 462 and 40 h, respectively. Light intensity and wavelength obviously affected the photolytic process. The EC50/LC50 values of algae (Chlorella vulgarrs), daphnia (Daphnia magna) and zabrafish (Brachydonio rerio) to glufosinate were all more than 100 mg·L-1, which were low toxic.

Key words: glufosinate, hydrolysis, photolysis, aquatic organism, ecotoxicity