Degradation of a novel herbicide fluchloraminopyr in soil: Dissipation kinetics, degradation pathways, transformation products identification and ecotoxicity assessment

IF 10.3 1区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environment International Pub Date : 2024-11-01 DOI:10.1016/j.envint.2024.109135

Wentao Zhou , Wenbo Zhang , Huiluan Han , Xiaohu Wu , Jun Xu , Fengshou Dong , Yongquan Zheng , Xiangwei Wu , Xinglu Pan

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引用次数: 0

Abstract

With the continuous application of new agricultural chemicals in agricultural systems, it is imperative to study the environmental fate and potential transformation products (TPs) of these chemicals to better assess their ecological and health risks, as well as guide scientific application. The dissipation of fluchloraminopyr was firstly evaluated under aerobic/anaerobic condition in four representative soils, with Dissipation Time 50 (DT₅₀) values ranging from 0.107 to 4.76 days. Eight TPs generated by soil degradation were identified via Ultra-High Performance Liquid Chromatography coupled with Quadrupole Time-of-Flight Mass Spectrometry (UHPLC-QTOF/MS) and Density Functional Theory (DFT) calculations. The predominant transformation reactions of fluchloraminopyr in soil include oxidation, dechlorination, hydroxylation, and acetylation. The predictions from toxicological software indicated that the acute and chronic toxicity of TPs to aquatic organisms was significantly lower than that of fluchloraminopyr. Moreover, both M267 and M221 exhibited higher acute oral toxicity to terrestrial organisms compared to the parent compound. Consequently, these findings offer essential ecological risk evaluation data for the judicious application of fluchloraminopyr.

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新型除草剂氟草胺在土壤中的降解：消散动力学、降解途径、转化产物鉴定和生态毒性评估

随着新型农用化学品在农业系统中的不断应用，必须对这些化学品的环境归宿和潜在转化产物（TPs）进行研究，以更好地评估其生态和健康风险，并指导科学应用。首先评估了四种代表性土壤在有氧/厌氧条件下氟草胺的消散情况，其消散时间 50 (DT50) 值从 0.107 天到 4.76 天不等。通过超高效液相色谱-四极杆飞行时间质谱（UHPLC-QTOF/MS）和密度泛函理论（DFT）计算，确定了土壤降解过程中产生的八种 TPs。氟草胺在土壤中的主要转化反应包括氧化、脱氯、羟基化和乙酰化。毒理学软件的预测结果表明，最终产品对水生生物的急性和慢性毒性明显低于氟草胺。此外，与母体化合物相比，M267 和 M221 对陆生生物的急性经口毒性更高。因此，这些发现为合理应用氟虫氨草醚提供了重要的生态风险评估数据。

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来源期刊

Environment International 环境科学-环境科学

CiteScore

21.90

自引率

3.40%

发文量

734

审稿时长

2.8 months

期刊介绍： Environmental Health publishes manuscripts focusing on critical aspects of environmental and occupational medicine, including studies in toxicology and epidemiology, to illuminate the human health implications of exposure to environmental hazards. The journal adopts an open-access model and practices open peer review. It caters to scientists and practitioners across all environmental science domains, directly or indirectly impacting human health and well-being. With a commitment to enhancing the prevention of environmentally-related health risks, Environmental Health serves as a public health journal for the community and scientists engaged in matters of public health significance concerning the environment.