Influence of pesticide mixture on their heterogeneous atmospheric degradation by ozone and OH radicals

Pesticides in the atmosphere can exist in both gaseous and particulate phases due to their semi-volatile properties. They can undergo degradation when exposed to atmospheric oxidants like ozone and hydroxyl radicals. The majority of studies on the atmospheric reactivity of pesticides study them in c...

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Bibliographic Details
Published in:Environmental pollution (1987) 2024-03, Vol.344, p.123351-123351, Article 123351
Main Authors: Samia, Boulos, Della Puppa, Loïc, Mattei, Coraline, Durand, Amandine, Ravier, Sylvain, Quivet, Etienne, Wortham, Henri
Format: Article
Language:English
Subjects:
Aniline Compounds
Atmosphere
Atmosphere - chemistry
Biodiversity and Ecology
Chemical Sciences
Environmental Sciences
Heterogeneous reactivity
Hydroxyl Radical - chemistry
OH radical
Other
Oxidants - chemistry
Ozone - chemistry
Ozonolysis
Pesticides - chemistry
Pesticides mixture
Silica particles
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Summary:Pesticides in the atmosphere can exist in both gaseous and particulate phases due to their semi-volatile properties. They can undergo degradation when exposed to atmospheric oxidants like ozone and hydroxyl radicals. The majority of studies on the atmospheric reactivity of pesticides study them in combination, without considering potential mixture effects that could induce uncertainties in the results. Therefore, this study aims to address this gap, through laboratory studies using a flow reactor, and by evaluating the degradation kinetics of pendimethalin mixed with folpet, tebuconazole, and S-metolachlor, which were simultaneously adsorbed on hydrophobic silica particles that mimic atmospheric aerosols. The comparison with other mixtures, including pendimethalin, from the literature has shown similar reactivity with ozone and hydroxyl radicals, indicating that the degradation kinetics of pesticides is independent of the mixture. Moreover, the degradation rates of the four pesticides under study indicate that they are not or slightly degraded by ozone, with half-lives ranging from 29 days to over 800 days. In contrast, when exposed to hydroxyl radicals, tebuconazole exhibited the fastest reactivity, with a half-life of 4 days, while pendimethalin had a half-life of 17 days. [Display omitted] •Laboratory kinetics data can be transferred to the real atmosphere.•The heterogeneous reactivity of multiple pesticides can be studied simultaneously.•Pesticide mixtures do not affect the degradation rate constants of pendimethalin.•Pendimethalin, folpet, tebuconazole and S-metolachlor are degraded by OH radicals.•Studied pesticides are not or slowly degraded by ozone.
ISSN:0269-7491
1873-6424
DOI:10.1016/j.envpol.2024.123351