Cyflumetofen degradation in different aquatic environments and identification of hydrolytic products
Cyflumetofen degradation in different aquatic environments and identification of hydrolytic products
复制标题
丁氟螨酯在不同水生环境中的降解及水解产物的鉴定
DOI：
10.1016/j.jece.2020.104512
复制
发表时间：
2020-12-01
影响因子：
7.7
通讯作者：
Fan, Bei
中科院分区：
文献类型：
--
作者：
Li, Minmin;Wang, Rui;Fan, Bei
残留在水环境中的农药可能会转化为复杂的代谢物，这些代谢物是危险的，对生物体有潜在的有害影响。氯氰菊酯是一种新型苯甲酰丙酮类杀螨剂，具有良好的杀虫效果，在中国中得到了广泛的应用。然而，中青虫在水环境中的行为很少有报道。本文研究了在pH分别为4.0、7.0和9.0、温度为25、35和45℃条件下，CyF及其主要代谢物2-(三氟甲基)苯甲酸(B-1)和2-(三氟甲基)苯甲酰胺(B-3)在Milli-Q水和地表水体系中的水解反应。结果表明，在不同的水环境中，CYF在缓冲溶液中的半衰期为1.2h~23.3d，符合一级反应动力学。在碱性条件(P<；0.001)和较高温度(P>；005)下，CyF的降解速度较快，且在地表水中的降解速度快于在米利-Q水中的降解速度。B-1的生成浓度显著高于B-3，在基本完全降解后，水环境中仍存在大量的B-1和B-3代谢物。并提出了该酶的主要水解途径。本研究结果对指导中草药的生态环境安全使用具有重要的现实意义。
Pesticides that persist in the aquatic environment may be transformed into complex metabolites, which are hazardous and have potentially harmful impacts on organisms. Cyflumetofen (CYF) is a novel benzoylacetonitile acaricide that has a good insecticidal effect and is widely used in China. However, the behavior of CYF in an aquatic environment has seldom been reported. In this study, the hydrolysis of CYF and its main metabolites, 2-(trifluoromethyl)benzoic acid (B-1) and 2-(trifluoromethyl)benzamide (B-3), were studied at pH values of 4.0, 7.0, and 9.0 and at temperatures of 25, 35, and 45 degrees C, in both Milli-Q water and surface water systems. It was demonstrated that CYF hydrolysis in different aqueous environments follows first-order kinetics, with half-lives ranging from 1.2 h to 23.3 d in a buffer solution. CYF hydrolyzes faster in alkaline conditions (P < 0.001) and at higher temperatures (P > 0.05), and the degradation rate in surface water is faster than that in Milli-Q water. The formation concentration of B-1 was significantly higher than that of B-3, and a large number of B-1 and B-3 metabolites still existed in the aqueous environment after CYF was almost fully degraded. The pathway of the main hydrolysis of CYF was also proposed. The results of this study are of practical significance in providing guidance for an ecologically and environmentally safe use of CYF.