PMID: 16509328Mar 3, 2006Paper

Atmospheric fate of dichlorvos: photolysis and OH-initiated oxidation studies

Environmental Science & Technology
V FeigenbrugelK Wirtz

Abstract

The OH-initiated oxidation of dichlorvos (a widely used insecticide) has been investigated under atmospheric conditions at the large outdoor European photoreactor (EUPHORE) in Valencia, Spain. The rate constant of OH reaction with dichlorvos, k, was measured by using a conventional relative rate technique where 1,3,5-trimethylbenzene (TMB) and cyclohexane were taken as references. With the use of the rate constants of 5.67 x 10(-11) and of 6.97 x 10(-12) cm3 molecule(-1) s(-1) for the reactions OH + TMB and OH + cyclohexane, respectively, the resulting value of the OH reaction rate constant with dichlorvos was derived to be k = (2.6 +/- 0.3) x 10(-11) cm3 molecule(-1) s(-1). The tropospheric lifetime of dichlorvos with respect to reaction with OH radical has been estimated to be around 11 h. The major carbon-containing products observed for the OH reaction with dichlorvos in air under sunlight condition were phosgene and carbon monoxide. The formation of a very stable toxic primary product such as phosgene associated with the relatively short lifetime of dichlorvos may make the use of this pesticide even more toxic for humans when released into the atmosphere.

References

Feb 19, 2004·Environmental Science & Technology·John C WengerJames A Franklin
May 13, 2004·Toxicology·P K Gupta

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Citations

Apr 23, 2013·Chemosphere·Luis Antonio Tortajada-GenaroAmalia Muñoz
Oct 22, 2013·Chemosphere·Amalia MuñozHoward Sidebottom
Mar 19, 2013·The Journal of Physical Chemistry. a·Mariam J Al RashidiEstelle Roth
Oct 19, 2013·The Journal of Physical Chemistry. a·Sara M Aschmann, Roger Atkinson
Feb 3, 2007·The Journal of Physical Chemistry. a·Ernesto C TuazonRoger Atkinson
Feb 24, 2010·The Journal of Physical Chemistry. a·Sara M AschmannRoger Atkinson
Jul 30, 2021·The Science of the Total Environment·Gbemisola J BamiduroElsayed M Zahran
May 7, 2020·The Journal of Physical Chemistry. a·Mateus Macedo QuintanoWillian Ricardo Rocha
Oct 17, 2007·Environmental Science & Technology·Qingzhu ZhangWenxing Wang

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