Abstract
The kinetics of the atrazine oxidation in aqueous solution by ozone was studied under different initial pH conditions and in the presence of a hydroxyl radical scavenger at pH 2.8. It was verified that the process took place mainly through radical reaction, even in acid medium. Therefore, a relatively high value of 26.4 L/(mol.s) for the rate constant of the direct reaction between molecular ozone and atrazine was found. After 10 minutes of oxidation, the degradation of the herbicide was more effective for pH 10.30 than for pHs 6.25 and 2.80. The mass transfer of ozone from the gas phase to the liquid phase was strongly affected by the oxygen flowrate and to a lesser extent by the stirring speed.
Highlights
IntroductionThe growing demand for agricultural products has driven the use of large amounts of pesticides to prevent or combat pests and ensure higher productivity (Sanches et al, 2003)
The growing demand for agricultural products has driven the use of large amounts of pesticides to prevent or combat pests and ensure higher productivity (Sanches et al, 2003).Due to their indiscriminate use, pesticides have been detected in surface and groundwaters throughout the world
Among the pesticides systematically monitored in the water bodies, atrazine (2-chloro-4ethylamino-6-isopropylamine-s-triazine) emerges as the most frequent and abundant (Sousa, 2002)
Summary
The growing demand for agricultural products has driven the use of large amounts of pesticides to prevent or combat pests and ensure higher productivity (Sanches et al, 2003). Due to their indiscriminate use, pesticides have been detected in surface and groundwaters throughout the world. Atrazine is a selective herbicide used in the control of weeds, especially in crops of maize, sugar cane and sorghum (Sanches et al, 2003). Studies have indicated that atrazine is resistant to biological degradation (Adams and Randtke, 1992). Several authors have studied different methods for degradation of this herbicide. Revista Ambiente & Água - An Interdisciplinary Journal of Applied Science: v. 5, n. 2, 2010
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Ambiente e Agua - An Interdisciplinary Journal of Applied Science
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
