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Physical Properties
Molecular weight:276.9; Physical form:Colourless solid. Composition:Tech. grade is c. 95% pure. Melting point:194-195 °C (sublimes at 135 °C/0.15 mmHg); ( tech., 183-192 °C); Vapour pressure:6.3 × 10-3 mPa (20 °C); Henry constant:1.34 ×10-5 Pa m3 mol-1 (calc.); Partition coefficient(n-octanol and water):logP = 2.8 (unionised); pKa:3.86; Solubility:In water 130 mg/l (20 °C). In dimethylformamide 610, tetrahydrofuran 410, acetone, cyclohexanone 170, methanol 90, ethanol 70, mineral oils <20, benzene 10 (all in g/l, 25 °C).; Stability:Very stable to dilute alkalis and acids. Stable to u.v. light. Thermally stable below the melting point.;
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Toxicology
Oral:Acute oral LD50 for rats 190, mice 110, rabbits 260, dogs c. 100 mg/kg. Percutaneous:Acute percutaneous LD50 for rats >2000, rabbits 3660 mg/kg. Mild eye irritant; non-irritating to skin (rabbits). Not a skin sensitiser (guinea pigs). Inhalation: LC50 (4 h) for rats 0.41 mg/ml. ADI:( JMPR) 0.03 mg/kg b.w. [1993].
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Environmental Profile
Ecotoxicology: Algae:EC50(72 h) for Scenedesmus subspicatus 140 mg/l.Bees: LD50(48 h, oral) 4 mg/bee; harmful to bees.Birds:Acute oral LD50 for pheasants 50, hens 240, quail 100-125, mallard ducks 200 mg/kg. Sub-acute oral LC50 (21 d) for pheasants 4000 ppm diet.Daphnia: LC50(48 h) 12.5 mg/l.Fish:LC50 (48 h) for goldfish 0.46, catfish 0.063 mg/l. Environmental fate: Animals:See plants.Soil:In soil, DT50 c. 10 d. Degraded by hydrolysis and debromination to less toxic substances such as hydroxybenzoic acid. For persistence in soil, see Pestic. Sci., 1980, 11, 341.Plant:Metabolism in plants and animals is by hydrolysis of the ester and nitrile groups, with some debromination occurring (J. H. Buckland, Pestic. Sci., 1973, 4, 149, 689).
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Transport Information
Signal Word:WARNING; Hazard Class:II(Moderately hazardous)