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Heterogeneous OH Oxidation, Shielding Effects, and Implications for the Atmospheric Fate of Terbuthylazine and Other Pesticides

J. Socorro, PSJ. Lakey, L. Han, T. Berkemeier, G. Lammel, C. Zetzsch, U. Pöschl, M. Shiraiwa,

. 2017 ; 51 (23) : 13749-13754. [pub] 20171117

Jazyk angličtina Země Spojené státy americké

Typ dokumentu časopisecké články

Perzistentní odkaz   https://www.medvik.cz/link/bmc18024494

Terbuthylazine (TBA) is a widely used herbicide, and its heterogeneous reaction with OH radicals is important for assessing its potential to undergo atmospheric long-range transport and to affect the environment and public health. The apparent reaction rate coefficients obtained in different experimental investigations, however, vary by orders of magnitude depending on the applied experimental techniques and conditions. In this study, we used a kinetic multilayer model of aerosol chemistry with reversible surface adsorption and bulk diffusion (KM-SUB) in combination with a Monte Carlo genetic algorithm to simulate the measured decay rates of TBA. Two experimental data sets available from different studies can be described with a consistent set of kinetic parameters resolving the interplay of chemical reaction, mass transport, and shielding effects. Our study suggests that mass transport and shielding effects can substantially extend the atmospheric lifetime of reactive pesticides from a few days to weeks, with strong implications for long-range transport and potential health effects of these substances.

Citace poskytuje Crossref.org

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$a Terbuthylazine (TBA) is a widely used herbicide, and its heterogeneous reaction with OH radicals is important for assessing its potential to undergo atmospheric long-range transport and to affect the environment and public health. The apparent reaction rate coefficients obtained in different experimental investigations, however, vary by orders of magnitude depending on the applied experimental techniques and conditions. In this study, we used a kinetic multilayer model of aerosol chemistry with reversible surface adsorption and bulk diffusion (KM-SUB) in combination with a Monte Carlo genetic algorithm to simulate the measured decay rates of TBA. Two experimental data sets available from different studies can be described with a consistent set of kinetic parameters resolving the interplay of chemical reaction, mass transport, and shielding effects. Our study suggests that mass transport and shielding effects can substantially extend the atmospheric lifetime of reactive pesticides from a few days to weeks, with strong implications for long-range transport and potential health effects of these substances.
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$a Lakey, Pascale S J $u Multiphase Chemistry Department, Max Planck Institute for Chemistry , 55128 Mainz, Germany. Department of Chemistry, University of California , Irvine, California 92617, United States.
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$a Han, Lei $u Forschungsstelle für Atmosphärische Chemie, University of Bayreuth , 95440 Bayreuth, Germany.
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$a Berkemeier, Thomas $u School of Chemical & Biomolecular Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States.
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$a Lammel, Gerhard $u Multiphase Chemistry Department, Max Planck Institute for Chemistry , 55128 Mainz, Germany. Research Centre for Toxic Compounds in the Environment, Masaryk University , 62500 Brno, Czech Republic.
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$a Zetzsch, Cornelius $u Multiphase Chemistry Department, Max Planck Institute for Chemistry , 55128 Mainz, Germany. Forschungsstelle für Atmosphärische Chemie, University of Bayreuth , 95440 Bayreuth, Germany.
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$a Pöschl, Ulrich $u Multiphase Chemistry Department, Max Planck Institute for Chemistry , 55128 Mainz, Germany.
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