The heterogeneous photo-oxidation of difenoconazole in the atmosphere

被引：21

作者：

Al Rashidi, M. ^{[1
]}

El Mouden, O. ^{[2
]}

Chakir, A. ^{[1
]}

Roth, E. ^{[1
]}

Salghi, R. ^{[2
]}

机构：

[1] Univ Reims, GSMA, CNRS, UMR 6089, F-51687 Reims, France

[2] Ecole Natl Sci Appl, Lab Ingn Procedes Energie & Environm, Agadir, Morocco

来源：

ATMOSPHERIC ENVIRONMENT | 2011年 / 45卷 / 33期

关键词：

Pesticide; Difenoconazole; Kinetics; Life-time; Atmospheric degradation; Heterogeneous reaction; OH RADICAL REACTIVITY; DEGRADATION-PRODUCTS; GAS-CHROMATOGRAPHY; AEROSOL-PARTICLES; PESTICIDES; OZONE; PHOTOLYSIS; SAMPLES; SOILS; AIR;

D O I：

10.1016/j.atmosenv.2011.07.062

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A photo-chemical reactor coupled to a UV spectrometer was used to investigate the degradation of difenoconazole deposited on a quartz surface by atmospheric oxidants, namely ozone and OH radicals. OH-oxidation experiments were conducted relative to a reference compound, the terbuthylazine. The rate constant of heterogeneous OH-oxidation of difenoconazole was found to be (7.1 +/- 0.8) 10(-14) cm(3) molecule(-1) s(-1). Meanwhile, ozone oxidation experiments were performed in the absolute mode and were interpreted by both, the Langmuir-Rideal (LR) and the Langmuir-Hinshelwood (LH) models of heterogeneous reactions. In the case of ozonolysis, a comparison between both models shows that, within the range of ozone concentration employed in this study, both models fit the experimental data correctly. The obtained results show that the atmospheric life-time of difenoconazole with respect to both oxidants is in the order of several months, meaning that this pesticide is relatively persistent, and may be transported over long distances. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：5997 / 6003

页数：7

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