Abstract
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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Acknowledgements
The work described in this article was supported by the Scientific research and innovation project of Weifang Medical University, the Weifang Science and Technology Development Plan Project, China (Grant No. 2023GX029).
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Huimin Zhu: Conceptualization, Methodology, Data collection. Xinqi Zhang: Writing first draft. Changjian Li: Review & editing, Supervision. Xueru Li: Visualization. Jinyuan Wu: Software, Validation. All authors read and approved the final manuscript.
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Zhu, H., Zhang, X., Li, C. et al. Photochemical Degradation of the New Nicotine Pesticide Acetamiprid in Water. Bull Environ Contam Toxicol 112, 62 (2024). https://doi.org/10.1007/s00128-024-03875-0
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DOI: https://doi.org/10.1007/s00128-024-03875-0