Full TGIF Record # 115024
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Web URL(s):http://www.tandfonline.com/doi/pdf/10.1080/03601239909373209
    Last checked: 10/09/2015
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Publication Type:
i
Report
Author(s):Harrison, S. K.; Venkatesh, R.
Author Affiliation:Department of Horticulture and Crop Science, College of Food, Agricultural and Environmental Sciences, Ohio State University, Columbus, Ohio
Title:Light regime, riboflavin, and pH effects on 2,4-D photodegradation in water
Source:Journal of Environmental Science and Health: Part B: Pesticides, Food Contaminants, and Agricultural Wastes. Vol. B34, No. 3, 1999, p. 469-489.
# of Pages:21
Publishing Information:New York: Marcel Dekker
Keywords:TIC Keywords: Riboflavin kinase; 2,4-D; Photodegradation; Ultraviolet radiation; Photolysis; Half-life; Water; Light quality; pH
Abstract/Contents:"A laboratory study was conducted to determine the effects of light regime, riboflavin, and pH on photodegradation of 2,4-D in aqueous solution. In controlled-environment chamber experiments, riboflavin sensitized 2,4-D photolysis in a concentration-dependent manner under both attenuated UV (-UV) and enhanced UV (+UV) light regimes. The photolysis half-life of 2,4-D in solutions containing 10 mg L-1 riboflavin was 9.7 and 12.5 h when exposed to +UV and -UV, respectively, compared to no photolysis in the absence of riboflavin. In contrast, the extrapolated half-life of 2,4-D in solutions containing 2.5 mg L-1 riboflavin was 46 h under +UV and 72 h under -UV. The rate of 2,4-D photolysis in the presence of riboflavin increased under both light regimes as initial pH of the solution was decreased from 7.5 to 4.5. The half-life of 2,4-D in the presence of 10 mg L-1 riboflavin at pH 4.5 and exposed to +UV was 1.6 h. Lumichrome, a principal photoproduct of riboflavin, did not photosensitize 2,4-D. Concentrations of 2,4-dichlorophenol formed as a result of riboflavin-sensitized 2,4-D photolysis were higher under the -UV that the +UV regime. These results indicate that riboflavin concentration, solution pH, and light regime are interacting factors that may be manipulated to enhance rates of aqueous 2,4-D photolysis."
Language:English
References:33
Note:Graphs
See Also:Other items relating to: 2, 4 - D in Turf
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Harrison, S. K., and R. Venkatesh. 1999. Light regime, riboflavin, and pH effects on 2,4-D photodegradation in water. J. Environ. Sci. Health. B34(3):p. 469-489.
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Web URL(s):
http://www.tandfonline.com/doi/pdf/10.1080/03601239909373209
    Last checked: 10/09/2015
    Requires: PDF Reader
    Access conditions: Item is within a limited-access website
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