Yao, Juan-Juan and Hoffmann, Michael R. and Gao, Nai-Yun and Zhang, Zhi and Li, Lei (2011) Sonolytic degradation of dimethoate: Kinetics, mechanisms and toxic intermediates controlling. Water Research, 45 (18). pp. 5886-5894. ISSN 0043-1354 http://resolver.caltech.edu/CaltechAUTHORS:20111219-112801354
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The sonolytic degradation of aqueous solutions of dimethoate, O,O-dimethyl S-[2-(methylamino)-2-oxoethyl]dithiophosphate, was examined. Optimal degradation rates were obtained at 619 kHz for continuous sonolysis and 406 kHz for pulse sonolysis. The primary pathways for degradation include hydroxyl radical oxidation, hydrolysis and pyrolysis on collapsing cavitation bubble interfaces. Reaction mechanisms coupled with the corresponding kinetic models are proposed to reproduce the observed concentration versus time profiles for dimethoate, omethoate and N-(methyl) mercaptoacetamide during sonolysis. The oxidation and hydrolysis of dimethoate and omethoate occurred at the water-bubble interface was the rate-determining step for sonolytic overall degradation of dimethoate. More than 90% toxicity of dimethoate was reduced within 45 min ultrasonic irradiation. Ferrous ion at micro molar level can significantly enhance the sonolytic degradation of dimethoate and effectively reduce the yields of toxic intermediate omethoate.
|Additional Information:||© 2011 Elsevier Ltd. Received 4 January 2011; revised 8 May 2011; Accepted 24 August 2011. Available online 5 September 2011. Support for this research was provided by the National Major Project of Science & Technology Ministry of China (Grant No. 2008ZX07421-002, 2009ZX07424-004), Development Project of Ministry of Housing and Urban-Rural Development of China (Grant No. 2009-K7-4) and the Fundamental Research Funds for Central Universities (Project No. CDJRC 11210002) by the Ministry of Education, China.|
|Official Citation:||Juan-Juan Yao, Michael R. Hoffmann, Nai-Yun Gao, Zhi Zhang, Lei Li, Sonolytic degradation of dimethoate: Kinetics, mechanisms and toxic intermediates controlling, Water Research, Volume 45, Issue 18, 15 November 2011, Pages 5886-5894, ISSN 0043-1354, 10.1016/j.watres.2011.08.042.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||19 Dec 2011 21:44|
|Last Modified:||19 Dec 2011 21:44|
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