Trifluralin:: Photolysis under sunlight conditions and reaction with HO radicals

被引：49

作者：

Le Person, A.

Mellouki, A.

Munoz, A.

Borras, E.

Martin-Reviejo, M.

Wirtz, K.

机构：

[1] CNRS, LCSR, F-45071 Orleans 02, France

[2] Fdn CEAM, E-46980 Valencia, Spain

来源：

CHEMOSPHERE | 2007年 / 67卷 / 02期

关键词：

herbicide; kinetics; atmospheric lifetime; degradation;

D O I：

10.1016/j.chemosphere.2006.09.023

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The gas phase atmospheric degradation of trifluralin (a widely used herbicide) has been investigated at the EUPHORE facility. Its photolysis has been studied under sunlight conditions and its reaction rate constant with HO center dot radicals was measured using the relative rate method. Using 1,3,5-trimethylbenzene as reference compound, the rate constant of HO center dot reaction with trifluralin was obtained to be k(HO center dot) = (1.7 +/- 0.4) x 10(-11) cm(3) Molecule s(-1) at (300 +/- 5) K and atmospheric pressure. The mean photolysis rate measured under solar radiation was J(trifluralin) = (1.2 +/- 0.5) x 10(-3) s(-1) (J(NO2) = 8 X 10(-3) s(-1)). The photolysis of trifluralin was found to generate organic aerosols with a yield of (20 +/- 10)%. The data obtained enabled us to discuss the atmospheric fate of trifluralin in the gas phase. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：376 / 383

页数：8

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