Common name: Bifenthrin
IUPAC name:
2-methylbiphenyl-3-ylmethyl (Z)-(1RS,3RS)-3-(2-chloro-3,3,3-trifluoroprop-1-enyl)-2,2-dimethylcyclopropanecarboxylate
Chemical Abstracts name:
(2-methyl[1,1'-biphenyl]-3-yl)methyl 3-(2-chloro-3,3,3-trifluoro-1-propenyl)-2,2-dimethylcyclopropanecarboxylate
CAS RN: [82657-04-3]
PHYSICAL CHEMISTRY
Mol. wt.: 422.9
Form:Viscous liquid; crystalline or waxy solid.
M.p.: 68-70.6 °C
V.p.: 0.024 mPa (25 ºC)
Kow logP >6
Henry:1.02×102 Pa m3 mol-1 (calc.)
S.g./density: 1.210 (25 ºC)
Solubility In water <1 mg/l. Soluble in acetone, chloroform, dichloromethane, diethyl ether, and toluene. Slightly soluble in heptane and methanol.
Stability Stable for 2 y at 25 ºC and 50 ºC (tech.). In natural daylight, DT50 255 d; stable 21 d at pH 5-9 (21 ºC).
TOXICOLOGY
Oral Acute oral LD50 for rats 54.5 mg/kg.
Skin and eye Acute percutaneous LD50 for rabbits >2000 mg/kg. Non-irritant to skin; virtually non-irritating to eyes (rabbits). No skin sensitisation (guinea pigs).
NOEL (1 y) for dogs 1.5 mg/kg daily. Non-teratogenic in rats (£2 mg/kg daily) and rabbits (8 mg/kg daily).
ADI (JMPR) 0.02 mg/kg
Toxicity class WHO (a.i.) II
EPA (formulation) II
ECOTOXICOLOGY
Birds Acute oral LD50 for bobwhite quail 1800, mallard ducks 2150 mg/kg. Dietary LC50 (8 d) for bobwhite quail 4450, mallard ducks 1280 mg/kg diet.
Fish LC50 (96 h) for bluegill sunfish 0.00035, rainbow trout 0.00015 mg/l.
Daphnia LC50 (48 h) 0.00016 mg/l. Low solubility in water and high affinity for soil contribute to produce little impact in aquatic systems under field conditions.
Bees LD50 (oral) 0.1 mg/bee; (contact) 0.01462 mg/bee.
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