Chemical Identification
Common Name
Tefluthrin
中文通用名
七氟菊酯
IUPAC
2,3,5,6-tetrafluoro-4-methylbenzyl (1RS,3RS)-3-[(Z)-2-chloro-3,3,3-trifluoroprop-1-enyl]-2,2-dimethylcyclopropanecarboxylate
or
2,3,5,6-tetrafluoro-4-methylbenzyl (1RS)-cis-3-[(Z)-2-chloro-3,3,3-trifluoroprop-1-enyl]-2,2-dimethylcyclopropanecarboxylate
CAS
(2,3,5,6-tetrafluoro-4-methylphenyl)methyl (1R,3R)-rel-3-[(1Z)-2-chloro-3,3,3-trifluoro-1-propenyl]-2,2-dimethylcyclopropanecarboxylate
CAS No.
79538-32-2
Molecular Formula
C17H14ClF7O2
Molecular Structure
Category
Activity
An insecticide used to control a wide range of soil pests including Coleoptera, Lepidoptera and Diptera
CropUse
maize, sugar beet, corn, grains, and other crops
Pest Spectrum
Coleoptera, Lepidoptera and Diptera
Formulation
CS = Capsule suspension
GR = Granule
SC = Suspension concentrate (=flowable concentrate)
Premix
Thiamethoxam+tefluthrin
Physical Properties
Molecular weight:418.7; Physical form:Colourless solid; ( tech., off-white). Density:1.48 g/ml (25 °C); Composition:Tech. material is c. 92% pure. Melting point:44.6 °C; ( tech., 39-43 °C); Flash point:124 °C; Vapour pressure:8.4 mPa (20 °C); 50 mPa (40 °C); Henry constant:2 ×102 Pa m3 mol-1 (calc.); Partition coefficient(n-octanol and water):logP = 6.4 (20 °C); pKa:>9 (hydrolysis prevents measurement); Solubility:In water 0.02 mg/l (purified and buffered, pH 5 and 9, 20 °C). In acetone, hexane, toluene, dichloromethane, ethyl acetate >500, methanol 263 (all in g/l, 21 °C).; Stability:Stable for at least 9 months at 15-25 °C. Stable for >84 days at 50 °C. Stable to hydrolysis at pH 5-7 for >30 days. At pH 9, 7% hydrolysis in 30 days. At pH 7, 27-30% loss in aqueous solution exposed to ;
Toxicology
Oral:Oral and percutaneous LD50 values of tefluthrin depend on such factors as carrier, the test species, its sex, age and degree of fasting; values reported sometimes differ markedly. Acute oral LD50 for Percutaneous:Acute percutaneous LD50 for male rats 316, female rats 177 mg/kg. Slight eye and skin irritation (rabbits). No skin sensitisation (guinea pigs). Inhalation: LC50 (4 h) for male rats 0.05, female rats 0.04 mg/l. ADI:( JMPR) 0.01 mg/kg b.w.
Environmental Profile
Ecotoxicology:
 Algae:>1.05 mg/l.Bees: LD50 (contact) 280 ng/bee; (oral) 1880 ng/bee.Birds:Acute oral LD50 for mallard ducks 4190, bobwhite quail 730 mg/kg. Sub-acute dietary LC50 (5 d) for mallard ducks 2317, bobwhite quail 15 000 mg/kg.Daphnia: EC50 (48 h) 70 ng/l.Fish:LC50 (96 h) for rainbow trout 60, bluegill sunfish 130 ng/l. Under field conditions, adsorption of tefluthrin on bottom and suspended sediments should prevent any hazard.Worms:0.32 mg/kg soil. 

Environmental fate: 
Animals:For a study of the metabolism of tefluthrin in the goat, see Pestic. Sci., 1989, 25, 375.Soil:DT50 in soil 150 d (5 °C), 24 d (20 °C), 17 d (30 °C), partly due to loss by volatilisation. At normal application rates, there was no effect on soil microflora or earthworms.Plant:No residues have been found on major crops treated at recommended rates (limit of detection 0.01 mg/kg).
Transport Information
Hazard Class:Ib(Highly hazardous)

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