Publisher : The Korean Society of Environmental Agriculture
DOI : 10.5338/KJEA.2014.33.2.134
Title & Authors
Photodegradation of Butachlor and Pyrazosulfuron-ethyl in Rice Paddy Water under Natural Sunlight Ok, Junghun; Watanabe, Hirozumi; Cho, Junglai; An, Nanhee; Lee, Byungmo;
BACKGROUND: Dissipation of herbicides in paddy water varies significantly, being dependent on environmental conditions such as sunlight. The photodegradation under natural sunlight may be one of natural degradation routes of herbicides dissipation. Therefore, the aim of this study was to monitor the degradation of butachlor and pyrazosulfuron-ethyl in paddy water under natural sunlight. METHODS AND RESULTS: The 12 water sample bottles of treatment were covered by quart glass plates, which allow about 90% of UV radiation (280-2000 nm) to pass through, to minimize the UV attenuation. The other 12 water sample bottles of the control were covered by glass lids and wrapped with aluminum foils to prevent the sunlight. The concentration of butachlor and pyrazosulfuron-ethyl in paddy water samples bottles was monitored under ambient conditions with and without natural sunlight. The concentration of butachlor and pyrazosulfuron-ethyl for treatment decreased from to and from to , respectively, during consecutive 21 days after herbicide application under natural sunlight. CONCLUSION: The concentration of butachlor in paddy water decreased quickly under ambient conditions with natural sunlight. The degradation of butachlor in paddy water was enhanced by the natural sunlight. However, the degradation of pyrazosulfuron-ethyl was insignificant under natural sunlight.
Chen, Y.L., Chen J.S., 1979. Degradation and dissipation of herbicide butachlor in paddy fields, J. Pestic. Sci. 4, 431-438.
Lin, Y.J., Lin, C., Yeh, K.J., Lee, A., 2000. Photodegradation of the herbicides butachlor and ronstar using natural sunlight and diethyamine, Bull. Environ. Contam. Toxicol. 64, 780-785.
Ok, J., Doan, N.H., Watanabe, H., Thuyet, D.Q., Boulange, J., 2012 Behavior of Butachlor and Pyrazosulfuron-ethyl in Paddy Water in Micro Paddy Lysimeter under Different Temperature Conditions in Spring and Summer, Bull. Environ. Contam. Toxicol. 89, 306-311.
Pusino, A., Braschi, I., Petretto, S., Gessa, C., 1999. Photodegradation of herbicide triasulfuron, Pestic. Sci. 55, 479-481.
Samanta, S., Kole, R.K., Chowdnury, A., 1999. Photodegradation of metsulfuron-methyl in aqueous solution, Chemosphere. 39, 873-879.
Sarmah, A.K., Kookana, R.S., Duffy, M.J., Alston, A.M., Harch, B.D., 2000. Hydrolysis of triasulfuron, metsulfuronmethyl and chlorsulfuron in alkaline soil and aqueous solutions, Pest Manage. Sci. 56, 463-471.
Sarmah, A.K., Sabadie, J., 2002. Hydrolysis of sulfonylurea herbicides in soils and aqueous solutions:a Review, J. Agric. Food. Chem. 50, 6253-6265.
Scrano, L., Bufo, S.A., Perucci, P., Meallier, P., Mansour, M., 1999. Photolysis and hydrolysis of rimsulfuron, Pestic. Sci. 55, 955-961.
Vulliet, E., Emmelin, C., Chovelon, J.M., 2004. Influence of pH and irradiation wavelength on the photochemical degradation of sulfonylureas, J. Photochem. Photobiol. A: Chemistry. 163, 69-75.
Zheng, W., Yates, S.R., Papiernik, S.K., 2008. Transformation kinetics and mechanism of the sulfonylurea herbicides pyrazosulfuron-ethyl and halosulfuron-methyl in aqueous solutions, J. Agric. Food. Chem. 56, 7367-7372.