{"title":"由共存的硝酸盐离子引发除草剂甲基三苯脲在日光农业排水中的光转化","authors":"Fang Xu, Yukuai Zhang, Longfei Su, Zhenxing Guo, Qiang Cheng, Liqiang Xu, Feng Wang, Guoping Sheng","doi":"10.1021/acs.jafc.4c09764","DOIUrl":null,"url":null,"abstract":"Understanding the environmental fate of chemical herbicides is crucial to sustainable agriculture. Due to their joint-use with nitrogen fertilizers, their residues often coexist with NO<sub>3</sub><sup>–</sup> in agricultural drainages. In this study, tribenuron-methyl was used as a model to evaluate the role of NO<sub>3</sub><sup>–</sup> in the phototransformation of chemical herbicides, which was characterized by a two-stage process. Initially, a slow hydrolysis occurs (<i>k</i><sub>obs</sub> = 2.573 × 10<sup>–4</sup> min<sup>–1</sup>), producing two hydrolysis products: methyl-2-(aminosulfonyl)-benzoate (MSB) and 2-methyl-4-methylamino-6-methoxy-1, 3, 5-triazine (MMT), which can be significantly accelerated by solar irradiation (<i>k</i><sub>obs</sub> = 2.152 × 10<sup>–2</sup> min<sup>–1</sup>). Subsequently, MSB undergoes a rapid NO<sub>3</sub><sup>–</sup>-initiated photodegradation process (<i>k</i><sub>obs</sub> = 2.251 × 10<sup>–2</sup> min<sup>–1</sup>). MMT was identified as the refractory unit and undergoes a slow NO<sub>3</sub><sup>–</sup>-initiated photodegradation process (<i>k</i><sub>obs</sub> = 4.494 × 10<sup>–4</sup> min<sup>–1</sup>). The underlying mechanisms were elucidated through electron paramagnetic resonance spectroscopy and reactive species quenching experiments. This study fills a knowledge gap on the interaction between NO<sub>3</sub><sup>–</sup> and chemical herbicides, highlighting the pivotal role of NO<sub>3</sub><sup>–</sup> in the phototransformation of chemical herbicides.","PeriodicalId":41,"journal":{"name":"Journal of Agricultural and Food Chemistry","volume":"14 1","pages":""},"PeriodicalIF":5.7000,"publicationDate":"2024-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Solar-Light-Mediated Phototransformation of Herbicide Tribenuron-Methyl Initiated by Its Coexisting Nitrate Ion in Sunlit Agricultural Drainages\",\"authors\":\"Fang Xu, Yukuai Zhang, Longfei Su, Zhenxing Guo, Qiang Cheng, Liqiang Xu, Feng Wang, Guoping Sheng\",\"doi\":\"10.1021/acs.jafc.4c09764\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Understanding the environmental fate of chemical herbicides is crucial to sustainable agriculture. Due to their joint-use with nitrogen fertilizers, their residues often coexist with NO<sub>3</sub><sup>–</sup> in agricultural drainages. In this study, tribenuron-methyl was used as a model to evaluate the role of NO<sub>3</sub><sup>–</sup> in the phototransformation of chemical herbicides, which was characterized by a two-stage process. Initially, a slow hydrolysis occurs (<i>k</i><sub>obs</sub> = 2.573 × 10<sup>–4</sup> min<sup>–1</sup>), producing two hydrolysis products: methyl-2-(aminosulfonyl)-benzoate (MSB) and 2-methyl-4-methylamino-6-methoxy-1, 3, 5-triazine (MMT), which can be significantly accelerated by solar irradiation (<i>k</i><sub>obs</sub> = 2.152 × 10<sup>–2</sup> min<sup>–1</sup>). Subsequently, MSB undergoes a rapid NO<sub>3</sub><sup>–</sup>-initiated photodegradation process (<i>k</i><sub>obs</sub> = 2.251 × 10<sup>–2</sup> min<sup>–1</sup>). MMT was identified as the refractory unit and undergoes a slow NO<sub>3</sub><sup>–</sup>-initiated photodegradation process (<i>k</i><sub>obs</sub> = 4.494 × 10<sup>–4</sup> min<sup>–1</sup>). The underlying mechanisms were elucidated through electron paramagnetic resonance spectroscopy and reactive species quenching experiments. This study fills a knowledge gap on the interaction between NO<sub>3</sub><sup>–</sup> and chemical herbicides, highlighting the pivotal role of NO<sub>3</sub><sup>–</sup> in the phototransformation of chemical herbicides.\",\"PeriodicalId\":41,\"journal\":{\"name\":\"Journal of Agricultural and Food Chemistry\",\"volume\":\"14 1\",\"pages\":\"\"},\"PeriodicalIF\":5.7000,\"publicationDate\":\"2024-12-25\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Agricultural and Food Chemistry\",\"FirstCategoryId\":\"97\",\"ListUrlMain\":\"https://doi.org/10.1021/acs.jafc.4c09764\",\"RegionNum\":1,\"RegionCategory\":\"农林科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"AGRICULTURE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Agricultural and Food Chemistry","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.1021/acs.jafc.4c09764","RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRICULTURE, MULTIDISCIPLINARY","Score":null,"Total":0}
Solar-Light-Mediated Phototransformation of Herbicide Tribenuron-Methyl Initiated by Its Coexisting Nitrate Ion in Sunlit Agricultural Drainages
Understanding the environmental fate of chemical herbicides is crucial to sustainable agriculture. Due to their joint-use with nitrogen fertilizers, their residues often coexist with NO3– in agricultural drainages. In this study, tribenuron-methyl was used as a model to evaluate the role of NO3– in the phototransformation of chemical herbicides, which was characterized by a two-stage process. Initially, a slow hydrolysis occurs (kobs = 2.573 × 10–4 min–1), producing two hydrolysis products: methyl-2-(aminosulfonyl)-benzoate (MSB) and 2-methyl-4-methylamino-6-methoxy-1, 3, 5-triazine (MMT), which can be significantly accelerated by solar irradiation (kobs = 2.152 × 10–2 min–1). Subsequently, MSB undergoes a rapid NO3–-initiated photodegradation process (kobs = 2.251 × 10–2 min–1). MMT was identified as the refractory unit and undergoes a slow NO3–-initiated photodegradation process (kobs = 4.494 × 10–4 min–1). The underlying mechanisms were elucidated through electron paramagnetic resonance spectroscopy and reactive species quenching experiments. This study fills a knowledge gap on the interaction between NO3– and chemical herbicides, highlighting the pivotal role of NO3– in the phototransformation of chemical herbicides.
期刊介绍:
The Journal of Agricultural and Food Chemistry publishes high-quality, cutting edge original research representing complete studies and research advances dealing with the chemistry and biochemistry of agriculture and food. The Journal also encourages papers with chemistry and/or biochemistry as a major component combined with biological/sensory/nutritional/toxicological evaluation related to agriculture and/or food.