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Chemical Identification
Common Name
Picolinafen
中文通用名
氟吡酰草胺
IUPAC
4′-fluoro-6-(α,α,α-trifluoro-m-tolyloxy)pyridine-2-carboxanilide
CAS
N-(4-fluorophenyl)-6-[3-(trifluoromethyl)phenoxy]-2-pyridinecarboxamide
CAS No.
137641-05-5
Molecular Formula
C19H12F4N2O2
Molecular Structure
Category
Activity
Herbicide
Premix
Pendimethalin+picolinafen
Premix Parters: phosalone;
Physical Properties
Molecular weight:376.3; Physical form:White, finely crystalline solid, with a musty, phenolic odour. Density:1.45; Melting point:107.2-107.6 °C; Flash point:>180 °C; Vapour pressure:1.66 × 10-7 mPa ( est., 20 °C); Henry constant:1.6 × 10-3 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP = 5.37; Solubility:In water 3.9 × 10-5 g/l (distilled water, 20 °C); 4.7 × 10-5 g/l ( pH 7, 20 °C). In acetone 55.7, dichloromethane 76.4, ethyl acetate 46.4, methanol 3.04 (all in g/100 ml).; Stability:Stable to hydrolysis at pH 4, 7 and 9 over 5 d (50 °C). Photodegradation DT50 24.8 d ( pH 5), 31.4 d ( pH 7), 22.6 d ( pH 9).
Toxicology
percutaneous LD50 for male and female rats >4000 mg/kg. Non-irritating to skin and eyes (rabbits); not a skin sensitiser (guinea pigs). Inhalation: LC50 (4 h) for male and female rats >5.9 mg/l. ADI:0.2 mg/ kg.
Environmental Profile
Ecotoxicology:
 Algae: EC50 for Anabaena 0.12 mg/l.Bees: LD50 (oral and dermal) >200µg/bee.Birds:Acute oral LD50 for bobwhite quail and mallard ducks >2250 mg/kg. Dietary LC50 for bobwhite quail and mallard ducks >5314 ppm in diet.Daphnia: EC50 (48 h) 0.612 mg/l.Fish: LC50 (96 h) for rainbow trout 0.281, bluegill sunfish >0.57 mg/l.Worms: LC50 (14 d) for earthworms >1000 mg/ kg. 

Environmental fate: 
Animals:Rapidly metabolised by hydrolytic cleavage of the amide bond, to yield the substituted picolinic acid and p-fluoroaniline.Soil:Hydrolytically stable, but photochemically degraded, DT50 23-31 d. Average field DT50 1 mo, DT90 <4 mo. Bound to soil, Koc (four soil types) 17 1Plant:Slowly metabolised in wheat with little translocation of parent or metabolites. Metabolism proceeds via cleavage of the amide bond. WATER SOLUBILITY: 0.000039 g/l at 20° C
Transport Information
Hazard Class:O (Obsolete as pesticide, not classified)

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