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Physical Properties
Molecular weight:292.3; Physical form:Colourless crystals; (tech., yellowish crystals). Melting point:172-176 °C; (tech., 166-172 °C); Vapour pressure:8.5×10-6 mPa (20 °C); Henry constant:1×10-7 Pa m3 mol-1 (pH 5, 20 °C); Partition coefficient(n-octanol and water):logP = 3.46; pKa:4.5-5.0; Solubility:In water 4 (pH 4.2), 20 (pH 5), 425 (pH 7) (all in mg/l, 20 °C), 100-200 g/l (pH 9, 20 °C). Readily soluble in dimethylformamide. Soluble in alcohols and acetone. Slightl; Stability:Thermally stable up to at least 150 °C. Not hydrolysed by water over 5 d (25 °C); DT50 >1 y (pH 4-9). Rapidly decomposed in aqueous solutions exposed to sunlight or u.v. light. Soluble in dichloromethane, 2-propanol; hardly soluble in toluene; nearly insoluble in n-hexane.
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Toxicology
Oral:Acute oral LD50 for rats 16.5, mice >1000, rabbits >500 mg/kg. Sub-chronic oral LD50 (5 d) for rats 0.3 mg/kg/day. Percutaneous:Acute percutaneous LD50 for rats 100-500 mg/kg. Inhalation:LC50 (4 h) for rats 39, mice 54 mg/m3. ADI:(JMPR) No ADI [1990]; for 'Perizin' 0.035 mg/kg.
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Environmental Profile
Ecotoxicology:
Algae:ErC50 >18 mg/l, EbC50 (72 h) 15.2 mg/l.Birds:Acute oral LD50 for Japanese quail >2000 mg/kg b.w. Dietary LC50 (8 d) for hens >50 mg/kg daily.Daphnia:LC50 (48 h) >14 mg/l.Fish:LC50 (96 h) for guppies c. 1000, rainbow trout 48, golden orfe 67 mg/l. Environmental fate:
Soil:BBA-standard soil 2.2 (aerobic conditions); 51% mineralisation in 90 days.
WATER SOLUBILITY: 20 mg/l at 20° C (pH 5)
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Transport Information
Signal Word:DANGER; Hazard Class:Ib (Highly hazardous)