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Influence of dissolved organic matter on the photodegradation and volatilization kinetics of chlorpyrifos in coastal waters

Paper ID Volume ID Publish Year Pages File Format Full-Text
26602 43965 2015 8 PDF Available
Title
Influence of dissolved organic matter on the photodegradation and volatilization kinetics of chlorpyrifos in coastal waters
Abstract

•Photolysis rate of chlorpyrifos in saline waters is enhanced by high inputs of DOM•Saline waters: photolysis and volatilization can be major transformation processes•Medium pressure Hg lamps are more efficient than other UV irradiation sources•The main degradation product of chlorpyrifos was 3,5,6-trichloro-2-pyridinol

Irradiation by a medium-pressure mercury (Hg) lamp was used to study the photodegradation of chlorpyrifos (O,O-diethyl-O-3,5,6-trichloropyridin-2-yl phosphorothioate) in salt, deionized water (unbuffered), and a natural saline water. The UV irradiation produces 3,5,6-trichloro-2-pyridinol (TCP) with accelerated photodegradation kinetics of the parent compound. The results show that chlorpyrifos photolysis followed pseudo-first-order kinetics in the presence and absence of salt with no significant difference between the photodegradation rates in saline waters and unbuffered deionized water. Addition of Suwannee River natural organic matter (SRNOM) to mimic the mixing of freshwaters with seawaters significantly changed the photodegradation rate constant of chlorpyrifos in saline waters. The influence of hydrolysis and volatilization was also evaluated. While photolysis was found to be the main transformation process in unbuffered deionized water, both volatilization and photolysis can be important pathways of chlorpyrifos loss in natural saline waters and under aerated conditions.

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Keywords
Chlorpyrifos; Pesticides; Dissolved organic matter; Photolysis; UV irradiation; Salinity
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Influence of dissolved organic matter on the photodegradation and volatilization kinetics of chlorpyrifos in coastal waters
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 310, 1 September 2015, Pages 189–196
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us