College of Plant Science, Jilin University, Changchun, Jilin 130062, China; College of Plant Protection, Jilin Agricultural University, Changchun, Jilin 130118, China; Center of Quality Standard and Testing Technology for Agro-Products, Jilin Agricultural University, Changchun, Jilin 130118, China.
College of Plant Protection, Jilin Agricultural University, Changchun, Jilin 130118, China.
Sci Total Environ. 2022 Aug 25;836:155448. doi: 10.1016/j.scitotenv.2022.155448. Epub 2022 May 1.
In the present study, aqueous behavior and fate of diamide insecticide tetrachlorantraniliprole (TCTP) were investigated under laboratory-controlled conditions. Half-lives of TCTP photolysis in natural water and pH buffers were 1.4-2.8 h, comparing with those of 1.2-231 d for hydrolysis. Both processes were highly influenced by pH with respect to degradation kinetics and routes. The hydrolysis rate of TCTP was accelerated by elevated temperatures. The presence of nitrate enhanced TCTP photolysis while fulvic acid exhibited suppression, with the extent of both effects as a function of concentration. Four degradation products were identified using a variety of spectroscopic approaches. Key reactions involved in the degradation pathways include intramolecular substitution and cyclization. There was a reduction in the acute toxicity of all four products to Daphnia magna by comparison with TCTP, whereas they were still classified as category 1 or 2 hazardous substances to the aquatic environment according to the Globally Harmonized System of Classification and Labelling of Chemicals (GHS) standards.
在本研究中，在实验室控制条件下研究了二酰胺类杀虫剂四氯虫酰胺（TCTP）在水中的行为和归宿。TCTP 在天然水和 pH 缓冲液中的光解半衰期为 1.4-2.8 小时，而水解半衰期为 1.2-231 天。这两个过程都受到 pH 值的高度影响，影响降解动力学和途径。TCTP 的水解速率随温度升高而加快。硝酸盐的存在会促进 TCTP 的光解，而腐殖酸则表现出抑制作用，这两种作用的程度取决于浓度。使用多种光谱方法鉴定了四种降解产物。降解途径中的关键反应包括分子内取代和环化。与 TCTP 相比，所有四种产物对大型溞的急性毒性均降低，但根据全球化学品统一分类和标签制度（GHS）标准，它们仍被归类为对水生环境具有 1 类或 2 类危害的物质。
