Full TGIF Record # 95186
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Web URL(s):http://www.tandfonline.com/doi/pdf/10.1081/PFC-120035925
    Last checked: 10/09/2015
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Publication Type:
i
Report
Author(s):Benitez, F. Javier; Acero, Juan L.; Real, Francisco J.; Roman, Silvia
Author Affiliation:Departamento de Ingeniería Química y Energética, Universidad de Extremadura, Badajoz, Spain
Title:Oxidation of MCPA and 2,4-D by UV radiation, ozone, and the combinations UV/H2O2 and O3/H2O2
Source:Journal of Environmental Science and Health: Part B: Pesticides, Food Contaminants, and Agricultural Wastes. Vol. B39, No. 3, May 2004, p. 393-409.
# of Pages:17
Publishing Information:New York: Marcel Dekker
Keywords:TIC Keywords: Oxidation; MCPA; 2,4-D; Radiation; Ozone; Pesticide degradation; Pesticide fate
Abstract/Contents:"The phenoxyalkyl acid derivative herbicides MCPA (4-chloro 2-methylphenoxyacetic acid) and 2,4-D (2,4-dichlorophenoxyacetic acid) were oxidized in ultrapure water by means of a monochromatic UV irradiation and by ozone, as well as by the combinations UV/H2O2 and O3/H2O2. In the direct photolysis of MCPA, the quantum yield at 20°C was directly evaluated and a value of 0.150 mol Eins-1 was obtained in the pH range 5-9, while a lower value of 0.41 × 10-2 mol Eins-1 was determined at pH = 3. Similarly, for 2,4-D a value of 0.81 × 10-2 mol Eins-1 was deduced, independent of the pH of work. The influence of the additional presence of hydrogen peroxide was established in the combined process UV/H2O2, and the specific contribution of the radical pathway to the global photo-degradation was evaluated. The oxidation by ozone and by the combination O3/H2O2 was also studied, with the determination of the rate constants for the reactions of both herbicides with ozone and hydroxyl radicals at 20°C. These rate constants for the direct reactions with ozone were 47.7 and 21.9 M-1s-1 for MCPA and 2,4-D respectively, while the found values for the rate constants corresponding to the radical reactions were 6.6 × 109 and 5.1 × 109M-1s-1."
Language:English
References:27
Note:Figures
Tables
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See Also:Other items relating to: 2, 4 - D in Turf
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Benitez, F. J., J. L. Acero, F. J. Real, and S. Roman. 2004. Oxidation of MCPA and 2,4-D by UV radiation, ozone, and the combinations UV/H2O2 and O3/H2O2. J. Environ. Sci. Health. B39(3):p. 393-409.
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Web URL(s):
http://www.tandfonline.com/doi/pdf/10.1081/PFC-120035925
    Last checked: 10/09/2015
    Requires: PDF Reader
    Access conditions: Item is within a limited-access website
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MSU catalog number: QH 545 .P4 J6
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