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Chemical Identification
Common Name
Diflufenzopyr
中文通用名
氟吡草腙
IUPAC
2-{(EZ)-1-[4-(3,5-difluorophenyl)semicarbazono]ethyl}nicotinic acid
CAS
2-[1-[[[(3,5-difluorophenyl)amino]carbonyl]hydrazono]ethyl]-3-pyridinecarboxylic acid
CAS No.
109293-97-2
Molecular Formula
C15H12F2N4O3
Molecular Structure
Category
Activity
Herbicide
Premix
Nicosulfuron+dicamba+diflufenzopyr
Wettable granular. Premix Parters: clomazone napropamide.
Physical Properties
Molecular weight:334.3. Physical form:Off-white, odourless solid. Density:0.24 (25 °C); Melting point:135.5 °C; Vapour pressure:1.0×10-1 mPa (20, 25 °C); Henry constant:<7×10-5 Pa m3 mol-1 (20 °C); Partition coefficient(n-octanol and water):logP = 0.037 ( pH 7); pKa:3.18; Solubility:In water 63 ( pH 5), 5850 ( pH 7), 10 546 ( pH 9) ppm (25 °C).; Stability:Hydrolysis DT50 13 d ( pH 5), 24 d ( pH 7), 26 d ( pH 9); aqueous photolysis DT50 7 d ( pH 5), 17 d ( pH 7).
Toxicology
Oral:Acute oral LD50 for male and female rats >5.0 g/ kg. Percutaneous:Acute percutaneous LD50 for male and female rabbits >5.0 g/kg. Mild eye irritant; not a skin irritant (rabbits). Inhalation: LC50 >2.93 mg/l.
Environmental Profile
Ecotoxicology: 
Algae: EC50 (5 d) for Selenastrum 0.11 mg/l.Bees: LD50 (contact) >90 µg/bee.Birds: LD50 for bobwhite quail >2250 mg/kg. LC50 for bobwhite quail and mallard ducks >5620 ppm.Daphnia: EC50 (48 h) 15 mg/l.Fish: LC50 (96 h) for bluegill sunfish >135 ppm, rainbow trout 106 mg/l. 
Environmental fate: 
Animals:Following oral administration, diflufenzopyr was partially absorbed and rapidly eliminated; 20-44 % of the dose was eliminated in urine and 49-79 % in faeces. By contrast, intravenously dosed rats excreted 61-89% of the dose in urine. Soil:DT50 for photolysis on soil 14 d, for aerobic soil metabolism (lab.) 8-10 d, for aerobic aquatic metabolism 20-26 d. Average DT50 in field soil 4.5 d. 
WATER SOLUBILITY: Soluble at 63 ppm
Transport Information
Hazard Class:O (Obsolete as pesticide, not classified)

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