新型烟碱农药啶虫脒在水中的光化学降解

IF 2.7 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Bulletin of Environmental Contamination and Toxicology Pub Date : 2024-04-14 DOI:10.1007/s00128-024-03875-0
Huimin Zhu, Xinqi Zhang, Changjian Li, Xueru Li, Jinyuan Wu
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引用次数: 0

摘要

啶虫脒是一种新型烟碱类杀虫剂,因其毒性低且具有特定的生物靶标特性而被广泛应用于现代农业。本研究旨在了解啶虫脒在水体中的光解模式,并阐明其降解产物和机理。研究发现,啶虫脒在纯水、紫外线、荧光和阳光等不同光源条件下表现出不同的光解速率,其光解半衰期在17.3至28.6 h之间。利用气相色谱-质谱法,成功分离并鉴定了啶虫脒暴露于纯水时产生的五种直接光解产物。利用密度泛函理论进一步分析了啶虫脒的分子结构,并预测了啶虫脒的光降解活性位点。啶虫脒在水中的光解转化机理主要与羟基取代和氧化作用有关。基于这些发现,提出了啶虫脒的综合转化途径。
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Photochemical Degradation of the New Nicotine Pesticide Acetamiprid in Water

Acetamiprid is a novel nicotinic pesticide widely used in modern agriculture because of its low toxicity and specific biological target properties. The objective of this study was to understand the photolysis pattern of acetamiprid in the water column and elucidate its degradation products and mechanism. It was observed that acetamiprid exhibited different photolysis rates under different light source conditions in pure water, with ultraviolet > fluorescence > sunlight; furthermore, its photolysis half-life ranged from 17.3 to 28.6 h. In addition, alkaline conditions (pH 9.0) accelerated its photolysis rate, which increased with pH. Using gas chromatography–mass spectrometry, five direct photolysis products generated during the exposure of acetamiprid to pure water were successfully separated and identified. The molecular structure of acetamiprid was further analyzed using density functional theory, and the active photodegradation sites of acetamiprid were predicted. The mechanism of the photolytic transformation of acetamiprid in water was mainly related to hydroxyl substitution and oxidation. Based on these findings, a comprehensive transformation pathway for acetamiprid was proposed.

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来源期刊
CiteScore
5.60
自引率
3.70%
发文量
230
审稿时长
1.7 months
期刊介绍: The Bulletin of Environmental Contamination and Toxicology(BECT) is a peer-reviewed journal that offers rapid review and publication. Accepted submissions will be presented as clear, concise reports of current research for a readership concerned with environmental contamination and toxicology. Scientific quality and clarity are paramount.
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