Kinetics of the heterogeneous photo oxidation of the pesticide bupirimate by OH-radicals and ozone under atmospheric conditions

H Bouya; M Errami; A Chakir; E Roth

doi:10.1016/j.chemosphere.2015.04.046

Kinetics of the heterogeneous photo oxidation of the pesticide bupirimate by OH-radicals and ozone under atmospheric conditions

Chemosphere. 2015 Sep:134:301-6. doi: 10.1016/j.chemosphere.2015.04.046. Epub 2015 May 15.

Authors

H Bouya¹, M Errami¹, A Chakir², E Roth³

Affiliations

¹ GSMA, UMR CNRS 7331, Université de Reims Champagne Ardenne, U.F.R. Sciences Exactes et Naturelles Moulin de la Housse, BP 1039, 51687 Reims, France; Equipe de Génie de l'Environnement et de Biotechnologie, ENSA, Université Ibn Zohr, BP 1136, Agadir, Morocco.
² GSMA, UMR CNRS 7331, Université de Reims Champagne Ardenne, U.F.R. Sciences Exactes et Naturelles Moulin de la Housse, BP 1039, 51687 Reims, France.
³ GSMA, UMR CNRS 7331, Université de Reims Champagne Ardenne, U.F.R. Sciences Exactes et Naturelles Moulin de la Housse, BP 1039, 51687 Reims, France. Electronic address: estelle.roth@univ-reims.fr.

PMID: 25966935
DOI: 10.1016/j.chemosphere.2015.04.046

Abstract

This article is concerned with the study of the photochemical degradation of bupirimate adsorbed on a quartz surface by atmospheric oxidants, namely ozone and OH radicals. OH oxidation experiments were conducted relative to two reference compounds, terbuthylazine and (4-chlorophenyl)(3,4-dimethoxyphenyl) methanone. Meanwhile, ozone oxidation experiments were performed in the absolute mode and were interpreted by both, the Surface Layer Reaction and the Gas Surface Reaction models of heterogeneous reactions. The obtained results show that the rate constants for the reactions between bupirimate and OH radicals and ozone are (cm(3)molecule(-1)s(-1)): (1.06 ± 0.87) × 10(-12) and (5.4 ± 0.3) × 10(-20), respectively. As a consequence, for the experimental conditions used in this study, the lifetime of bupirimate at quartz like surface/atmosphere interfaces is several months against ozone and a tenth of days against OH-radical.

Keywords: Bupirimate; Heterogeneous degradation; Kinetics; Lifetime; Pesticide.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Adsorption
Atmosphere / chemistry
Climate
Hydroxyl Radical / chemistry*
Kinetics
Mesylates / chemistry*
Models, Chemical*
Oxidants / chemistry
Oxidation-Reduction
Ozone / chemistry*
Pesticides / chemistry*

Substances

Mesylates
Oxidants
Pesticides
Hydroxyl Radical
bupirimate
Ozone