Degradation of sulfosulfuron, a sulfonylurea herbicide, as influenced by abiotic factors.
A laboratory experiment was conducted to study the stability of sulfosulfuron [1-(2-ethylsulfonylimidazo[1,2-a]pyridin-3-ylsulfonyl)-3-(4,6-dimethoxypyrimidin-2yl) urea] in a controlled environment of pH, temperature, solvent, and surface. In another experiment the photostability of sulfosulfuron was studied after irradiation under sunlight. Under alkaline condition, it yielded 1-(2-ethylsulfonylimidazo[1,2-a]pyridin-3-yl-3-(4,6-dimethoxypyrimidin-2-yl) amine, and under acidic condition it degraded to 1-(2-ethylsulfonylimidazo[1,2-a] pyridin)-3-sulfonamide and 4,6-dimethoxy-2-aminopyrimidine. Photodegradation included breaking of a sulfonylurea bridge, as in the case of acidic hydrolysis and contraction of the sulfonylurea bridge was the major pathway of alkaline hydrolysis.
Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi 110012, India.
Supradip
S
Saha
Gita
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Kulshrestha
D004355:Drug Stability; D006540:Herbicides / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D007700:Kinetics; D010777:Photochemistry; D011743:Pyrimidines / Q000737:chemistry*; D012997:Solvents; D013449:Sulfonamides / Q000737:chemistry*; D013472:Sunlight; D013696:Temperature
D006540:Herbicides; D011743:Pyrimidines; D012997:Solvents; D013449:Sulfonamides; C439268:sulfosulfuron