The gas-phase degradation of chlorpyrifos and chlorpyrifos-oxon towards OH radical under atmospheric conditions

[Display omitted] •The gas phase atmospheric degradation of chlorpyrifos was investigated at EUPHORE.•The gas phase atmospheric degradation of chlorpyrifos-oxon was also investigated.•First experimental value for the rate constant of chlorpyrifos-oxon with respect to OH.•The atmospheric lifetime wit...

Full description

Saved in:
Bibliographic Details
Published in:Chemosphere (Oxford) 2014-09, Vol.111, p.522-528
Main Authors: Muñoz, Amalia, Ródenas, Milagros, Borrás, Esther, Vázquez, Mónica, Vera, Teresa
Format: Article
Language:English
Subjects:
Air Pollutants - analysis
Air Pollutants - chemistry
Applied sciences
Atmosphere - analysis
Atmospheric degradation
Atmospheric pollution
Atmospherics
Barometric pressure
Chemical composition and interactions. Ionic interactions and processes
Chlorpyrifos
Chlorpyrifos - analogs & derivatives
Chlorpyrifos - analysis
Chlorpyrifos - chemistry
Chlorpyrifos-oxon
Earth, ocean, space
Exact sciences and technology
External geophysics
Gases - analysis
Gases - chemistry
Hydroxyl Radical - chemistry
Insecticides - analysis
Insecticides - chemistry
Meteorology
Outdoor
Oxidation-Reduction
Photolysis
Photooxidation
Pollutants physicochemistry study: properties, effects, reactions, transport and distribution
Pollution
Pyridones - analysis
Radicals
Rate constants
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:[Display omitted] •The gas phase atmospheric degradation of chlorpyrifos was investigated at EUPHORE.•The gas phase atmospheric degradation of chlorpyrifos-oxon was also investigated.•First experimental value for the rate constant of chlorpyrifos-oxon with respect to OH.•The atmospheric lifetime with respect to OH of chlorpyrifos is 2h.•The atmospheric lifetime with respect to OH of chlorpyrifos-oxon is 11h. The OH initiated oxidation of chlorpyrifos (a widely used insecticide) and its photooxidation product chlorpyrifos-oxon were investigated at the large outdoor European Photoreactor (EUPHORE). The rate constants for reaction of chlorpyrifos and chlorpyrifos oxon with OH radicals were measured using a conventional relative rate method. The value of the OH reaction rate constants with chlorpyrifos and chlorpyrifos-oxon were determined to be k=(9.1±2.1)×10−11cm3molecule−1s−1 and (1.7±0.9)×10−11cm3molecule−1s−1 at 303±5K and atmospheric pressure. They gave an atmospheric lifetime in relation to the reaction with OH of approximately 2h and 11h for chlorpyrifos and chlorpyrifos-oxon, respectively. Photolysis was found to be unimportant relative to reaction with OH. The main products detected in the gas phase from the reaction of OH with chlorpyrifos were SO2, chlorpyrifos-oxon, 3,5,6-trichloro-2-pyridinol and diethylphosphate with molar yields of 17±5%, ∼10%, 8±4% and 30±9%, respectively.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2014.04.087