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.
Saha
Supradip
S
Division of Agricultural Chemicals, Indian Agricultural Research Institute, New Delhi 110012, India.
Kulshrestha
Gita
G
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