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  Heterogeneous OH oxidation, shielding effects and implications for the atmospheric fate of terbuthylazine and other pesticides

Socorro, J., Lakey, P. S. J., Han, L., Berkemeier, T., Lammel, G., Zetzsch, C., et al. (2017). Heterogeneous OH oxidation, shielding effects and implications for the atmospheric fate of terbuthylazine and other pesticides. Environmental Science & Technology, 51. doi:10.1021/acs.est.7b04307.

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 Creators:
Socorro, J.1, Author              
Lakey, Pascale S. J.1, Author              
Han, Lei, Author
Berkemeier, Thomas, Author
Lammel, Gerhard1, Author              
Zetzsch, Cornelius1, Author              
Pöschl, Ulrich1, Author              
Shiraiwa, Manabu, Author
Affiliations:
1Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              

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 Abstract: 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 multi-layer 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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Language(s): eng - English
 Dates: 2017
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1021/acs.est.7b04307
 Degree: -

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Title: Environmental Science & Technology
Source Genre: Journal
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Publ. Info: Easton, PA : American Chemical Society
Pages: 20 Volume / Issue: 51 Sequence Number: - Start / End Page: - Identifier: ISSN: 0013-936X
CoNE: https://pure.mpg.de/cone/journals/resource/954921342157