article · Proceedings of the National Academy of Sciences
The neonicotinoid pesticide nitenpyram is widely applied in agricultural operations and for flea management in domestic animals. When exposed to atmospheric pollutants such as ozone, the substance undergoes oxidation, creating new chemical derivatives that possess toxicological profiles distinct from the parent compound. Analysis of the ozonolysis process reveals that several resulting breakdown products do not contain oxygen, despite developing within an intensely oxidising chemical environment. Furthermore, this degradation pathway releases nitrous acid, which serves as a major precursor to reactive hydroxyl free radicals in the air. Documenting this unusual reaction mechanism is essential for accurately mapping the atmospheric lifetime, degradation pathways, and broader environmental impacts of nitenpyram.
Pesticides interact continuously with air pollutants, generating secondary compounds that behave unpredictably in the environment. Demonstrating that nitenpyram breaks down into unexpected, oxygen-free substances and generates airborne nitrous acid enables environmental scientists and regulators to properly assess the true ecological and atmospheric consequences of widespread agricultural and veterinary chemical use.
This is early-stage research focused on fundamental reaction pathways rather than a direct commercial technology. The findings could eventually be utilised by environmental regulators, ecotoxicologists, and agrochemical manufacturers to refine environmental impact assessments and safety data for pesticide registrations. Any direct application remains far from market, as the findings serve primarily to improve chemical hazard modelling and atmospheric monitoring protocols.
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Significance The neonicotinoid nitenpyram (NPM) has widespread use in agricultural settings and for flea control in animals. This may be oxidized on contact with air pollutants such as ozone to form new products that have different toxicity compared to the parent compound, yet little is known of the reaction kinetics, products, and mechanisms. We show here that many of the ozonolysis products of NPM do not contain oxygen, despite the highly oxidizing environment. Understanding such unusual and previously unrecognized chemistry is critical for accurate assessment of the environmental fates and impacts of this neonicotinoid. We also show that nitrous acid, a major source of the highly reactive hydroxyl free radical in air (but whose sources are controversial), is also generated.
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DOI: 10.1073/pnas.2002397117
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