Degradation kinetics, pathways, transformation products, and toxicity assessment of fluorochloridone in agricultural soils

IF 6.2 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Dong Zhao , Hongyu Chen , Shuo Shen , Enyu Lu , Junlong Feng , Hui Zhi , Lei Wang , Wei Li
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Abstract

Flurochloridone (FLC) is a pyrrolidone herbicide used to control broad-leaved weeds in various crop fields. However, there is still a lack of comprehensive research on the environmental fate of the Qinghai-Tibet Plateau (QTP) and the toxicity of its potential transformation products (TPs). In this study, laboratory experiments were conducted to investigate the degradation kinetics, pathways, and toxicity of FLC’s TPs. Nine TPs were identified in soil using Ultra-Performance Liquid Chromatography Quadrupole-Orbitrap Mass Spectrometry (UPLC-Q-Exactive Orbitrap MS) and Compound Discoverer software, employing suspect and nontarget screening strategies. The initial report of two TPs, TP204, and TP191 was confirmed through the acquisition or synthesis of their standards. High Performance Liquid Chromatography coupled with Tandem Mass Spectrometry (HPLC-MS/MS) was subsequently used for further quantification of these TPs in all samples under examination. The primary transformation reactions of FLC in the environment include oxidative dechlorination, reductive dechlorination, reductive defluorination, acetylation, and hydrolysis. Predictive assessments via ECOSAR, alongside empirical laboratory experiments, revealed that most novel TPs exhibit significantly lower acute toxicity towards Danio rerio, Daphnia magna Straus, and Algae compared to FLC. However, TP204 demonstrated neutral chronic toxicity towards Daphnia magna Straus and Green algae, potentially posing a latent threat to aquatic ecosystems. These results are crucial for elucidating the environmental fate of FLC, assessing environmental risks, and guiding scientific and reasonable use. This research holds significant importance for the ecological environment protection in the Tibetan Plateau region.
氟氯酮在农业土壤中的降解动力学、途径、转化产物和毒性评估。
氟氯酮(FLC)是一种吡咯烷酮类除草剂,用于防治各种农田的阔叶杂草。然而,目前对青藏高原的环境命运及其潜在转化产物的毒性研究尚缺乏全面的研究。本研究通过实验室实验研究了FLC中TPs的降解动力学、途径和毒性。采用超高效液相色谱-四极杆轨道rap质谱(UPLC-Q-Exactive Orbitrap MS)和Compound Discoverer软件,采用可疑和非目标筛选策略,鉴定了土壤中的9种TPs。两种TPs TP204和TP191的初步报告通过获取或综合其标准得到证实。随后使用高效液相色谱-串联质谱(HPLC-MS/MS)对所有检测样品中的TPs进行进一步定量。FLC在环境中的主要转化反应包括氧化脱氯、还原性脱氯、还原性脱氟、乙酰化和水解。通过ECOSAR进行的预测评估以及经验实验室实验显示,与FLC相比,大多数新型TPs对达尼奥河鼠、大水蚤和藻类的急性毒性显着降低。然而,TP204对大水蚤和绿藻表现出中性的慢性毒性,对水生生态系统具有潜在的威胁。这些结果对于阐明FLC的环境命运,评估其环境风险,指导其科学合理利用具有重要意义。该研究对青藏高原地区的生态环境保护具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
12.10
自引率
5.90%
发文量
1234
审稿时长
88 days
期刊介绍: Ecotoxicology and Environmental Safety is a multi-disciplinary journal that focuses on understanding the exposure and effects of environmental contamination on organisms including human health. The scope of the journal covers three main themes. The topics within these themes, indicated below, include (but are not limited to) the following: Ecotoxicology、Environmental Chemistry、Environmental Safety etc.
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