Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Heterogeneous reactions of ozone with commonly used pesticides adsorbed on silica particles
https://orcid.org/0000-0002-9211-6347
Abstract There is an increasing concern about the pesticides spread in the atmosphere. They can be found in the gas-phase but because of their physico-chemical properties they mostly remain adsorbed on the surface of the atmospheric particles. The kinetic data of the adsorbed pesticides towards atmospheric oxidants such as ozone and hydroxyl radicals are very scarce. Here we present the kinetic data set for the heterogeneous reactions of gas-phase ozone and eight commonly used pesticides adsorbed on silica particles. The obtained rate constants are described by both kinetic patterns, i.e., Langmuir–Rideal (L–R) and Langmuir–Hinshelwood (L–H) mechanisms. Concerning the L–R mechanism the rate constants range between 3.4 · 10−19 cm3 molecules−1 s−1 and 8.8 · 10−19 cm3 molecules−1 s−1. With respect to the L–H mechanism, the values of air–silica partitioning coefficient () vary between 21 · 10−16 cm3 molecules−1 and 358 · 10−16 cm3 molecules−1. The maximum rate constants range between 0.4 · 10−4 and 1.7 · 10−4 s−1. The estimated lifetimes of the selected pesticides according to both L–R and L–H mechanism span from 8 to >33 days, demonstrating that these species are very persistent with respect to ozone reactivity in the atmosphere. The results obtained in this study can contribute to better describe the atmospheric fate of pesticides in the particulate phase.
Highlights The ozonolysis constants and the lifetimes of 8 commonly used pesticides are assessed. The experimental data are described by both L–R and L–H kinetic mechanism. Adsorbed pesticides react slowly towards ozone in the atmosphere.
Heterogeneous ozonolysis: slow reaction of 8 commonly used pesticides adsorbed on particles.
Heterogeneous reactions of ozone with commonly used pesticides adsorbed on silica particles
https://orcid.org/0000-0002-9211-6347
Abstract There is an increasing concern about the pesticides spread in the atmosphere. They can be found in the gas-phase but because of their physico-chemical properties they mostly remain adsorbed on the surface of the atmospheric particles. The kinetic data of the adsorbed pesticides towards atmospheric oxidants such as ozone and hydroxyl radicals are very scarce. Here we present the kinetic data set for the heterogeneous reactions of gas-phase ozone and eight commonly used pesticides adsorbed on silica particles. The obtained rate constants are described by both kinetic patterns, i.e., Langmuir–Rideal (L–R) and Langmuir–Hinshelwood (L–H) mechanisms. Concerning the L–R mechanism the rate constants range between 3.4 · 10−19 cm3 molecules−1 s−1 and 8.8 · 10−19 cm3 molecules−1 s−1. With respect to the L–H mechanism, the values of air–silica partitioning coefficient () vary between 21 · 10−16 cm3 molecules−1 and 358 · 10−16 cm3 molecules−1. The maximum rate constants range between 0.4 · 10−4 and 1.7 · 10−4 s−1. The estimated lifetimes of the selected pesticides according to both L–R and L–H mechanism span from 8 to >33 days, demonstrating that these species are very persistent with respect to ozone reactivity in the atmosphere. The results obtained in this study can contribute to better describe the atmospheric fate of pesticides in the particulate phase.
Highlights The ozonolysis constants and the lifetimes of 8 commonly used pesticides are assessed. The experimental data are described by both L–R and L–H kinetic mechanism. Adsorbed pesticides react slowly towards ozone in the atmosphere.
Heterogeneous ozonolysis: slow reaction of 8 commonly used pesticides adsorbed on particles.
Heterogeneous reactions of ozone with commonly used pesticides adsorbed on silica particles
https://orcid.org/0000-0002-9211-6347
Abstract There is an increasing concern about the pesticides spread in the atmosphere. They can be found in the gas-phase but because of their physico-chemical properties they mostly remain adsorbed on the surface of the atmospheric particles. The kinetic data of the adsorbed pesticides towards atmospheric oxidants such as ozone and hydroxyl radicals are very scarce. Here we present the kinetic data set for the heterogeneous reactions of gas-phase ozone and eight commonly used pesticides adsorbed on silica particles. The obtained rate constants are described by both kinetic patterns, i.e., Langmuir–Rideal (L–R) and Langmuir–Hinshelwood (L–H) mechanisms. Concerning the L–R mechanism the rate constants range between 3.4 · 10−19 cm3 molecules−1 s−1 and 8.8 · 10−19 cm3 molecules−1 s−1. With respect to the L–H mechanism, the values of air–silica partitioning coefficient () vary between 21 · 10−16 cm3 molecules−1 and 358 · 10−16 cm3 molecules−1. The maximum rate constants range between 0.4 · 10−4 and 1.7 · 10−4 s−1. The estimated lifetimes of the selected pesticides according to both L–R and L–H mechanism span from 8 to >33 days, demonstrating that these species are very persistent with respect to ozone reactivity in the atmosphere. The results obtained in this study can contribute to better describe the atmospheric fate of pesticides in the particulate phase.
Highlights The ozonolysis constants and the lifetimes of 8 commonly used pesticides are assessed. The experimental data are described by both L–R and L–H kinetic mechanism. Adsorbed pesticides react slowly towards ozone in the atmosphere.
Heterogeneous ozonolysis: slow reaction of 8 commonly used pesticides adsorbed on particles.
Heterogeneous reactions of ozone with commonly used pesticides adsorbed on silica particles
Socorro, Joanna (Autor:in) / Gligorovski, Sasho (Autor:in) / Wortham, Henri (Autor:in) / Quivet, Etienne (Autor:in)
Atmospheric Environment ; 100 ; 66-73
24.10.2014
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Aerosols , Ozonolysis , Pesticides , Kinetics
Online Contents | 1997
Online Contents | 1996