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Photodegradation of Propaquizafop in Water Under UV Irradiation: The Identification of Transformation Products and Elucidation of Photodegradation Pathway

文献类型： 外文期刊

作者： Cheng, Zhijia 1 ; Lu, Zhongbin 2 ; Shao, Zhiwei 3 ; Huang, Bowen 4 ; Xiong, Yang 2 ; Fei, Hongqiang 5 ; Wu, Xian 1 ; Liu, Yanwei 1 ; Li, Mei 6 ; Hou, Zhiguang 2 ; Lu, Zongzhi 1 ;

作者机构： 1.Jilin Acad Agr Sci, Inst Plant Protect, Gongzhuling 136100, Peoples R China

2.Jilin Agr Univ, Coll Plant Protect, Changchun 130118, Peoples R China

3.Jilin Acad Agr Sci, Inst Agr Qual Stand & Testing Technol, Changchun 130033, Peoples R China

4.Wuxi Food Safety Inspect & Test Ctr, Wuxi 214000, Peoples R China

5.Jilin City Acad Agr Sci, Jilin 132101, Peoples R China

6.Shandong Acad Agr Sci, Inst Plant Protect, Jinan 250100, Peoples R China

关键词： propaquizafop; photolysis; kinetics; transformation product

期刊名称：AGRONOMY-BASEL （ 影响因子：3.4； 五年影响因子：3.8 ）

ISSN：

年卷期： 2024 年 14 卷 12 期

页码：

收录情况： SCI

摘要： The photolysis kinetics of propaquizafop in water under ultraviolet light was investigated in this study, and the effects of different influencing factors (pH, NO3-, metal ions) on the photolysis of propaquizafop were clarified. Propaquizafop residues in water were determined by a HPLC-UV detector. The results showed that the pH of the aqueous solution had no significant effect on the photolysis of propaquizafop (p < 0.05). The low NO3-, concentration (0.5 similar to 2 mmol/L) had a weak inhibitory effect on the photolysis of the propaquizafop; when the concentration of NO3- was 4 mmol/L, the degradation half-life of the propaquizafop was significantly higher than with other treatments (p < 0.05); Different concentrations of Fe3+ had varying degrees of inhibitory effects on the photolysis of propaquizafop. The inhibitory effect was stronger at low concentrations (0.5 mmol/L and 1 mmol/L) and weaker at high concentrations (2 mmol/L and 4 mmol/L). As the concentrations of Cu2+, Cd2+, Mn2+, Zn2+, and Ni2+ increased, their inhibitory effect on the photolysis of propaquizafop in an aqueous solution became stronger. In addition, LC-QTOF-MS was used to identify the photoproducts of propaquizafop in aqueous solution in this study. Five types of photoproducts were identified, and several propaquizafop degradation pathways and mechanisms were proposed, mainly including rearrangement, cracking reactions, dechlorination reactions, and light-induced redox reactions. The results of this study will help us to better understand the photodegradation law of propaquizafop in aqueous solution and provide data support for its safety evaluation in water.

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