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Chemical Identification
Common Name
Trifloxysulfuron
中文通用名
三氟啶磺隆
IUPAC
1-(4,6-dimethoxypyrimidin-2-yl)-3-[3-(2,2,2-trifluoroethoxy)-2-pyridylsulfonyl]urea
CAS
N-[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]-3-(2,2,2-trifluoroethoxy)-2-pyridinesulfonamide
CAS No.
145099-21-4,199119-58-9
Molecular Formula
C14H14F3N5O6S
Molecular Structure
Physical Properties
Molecular weight:459.3 (sodium salt); 437.4 (acid); Physical form:Odourless, white to off-white powder. Density:1.63 g/cm3 (21 °C); Melting point:170.2-177.7 °C; Vapour pressure:<0.01 mPa (25 °C); Henry constant:2.6 ×10-5 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP = -0.43 ( pH 7, 25 °C); pKa:4.76 (20 °C); Solubility:In water 5016 mg/l ( pH 7, 25 °C).; Stability:Hydrolysis DT50 20 d (pH 7, 25 °C); photolysis DT50 7 h (25 °C).;
Toxicology
Oral:Acute oral LD50 for rats >5000 mg/kg. Percutaneous:Acute percutaneous LD50 for rats >2000 mg/kg. Non-irritating to skin and eyes (rabbits). Not a skin sensitiser (guinea pigs). Inhalation: LC50 for rats (4 h) >5.03 mg/l.
Environmental Profile
Ecotoxicology: 
Algae: IC50 (120 h) for Navicula >150, Skeletonema 80, Anabaena 0.28, Selenastrum 0.0065 mg/l.Bees:LD50 (48 h) (oral and contact) >25 µg/bee.Birds: LD50 for mallard ducks >2000, bobwhite quail >2250 mg/kg. Dietary NOEC for mallard ducks and bobwhite quail 5620 ppm.Daphnia: EC50 (48 h) >108 mg/l.Fish: LC50 (96 h) for rainbow trout and bluegill sunfish >103 mg/l.Worms:Acute LC50 (14 d) >1000 mg/kg soil.Other aquatic spp.: EC50 (96 h) for Eastern oyster >103 mg/l.Other beneficial spp.:Not harmful to Typhlodromus, Aphidius, Poecilus; no effect on soil microbes (respiration, nitrification) or on activated sewage sludge. 

Environmental fate: 
Trifloxysulfuron is rapidly absorbed and degraded, and shows no tendency to accumulate in organisms or the environment.Animals:Rapidly absorbed and excreted (c. 70% via urine, 6% via faeces); after 7 d, remaining residues were <0.3% of dose; metabolism is via O-demethylation, bridge cleavage, glucuronide conjugation.Soil:Soil adsorption Koc 29-584 ml/cm3 depending on soil type and pH; increasing adsorption over time; DT50 (20 °C, 40% MWC; various soils) 49-78 d. Aqueous
Transport Information
Hazard Class:III(Slightly hazardous)

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