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Chemical Identification
Common Name
Methyl isothiocyanate
methyl isothiocyanate
Molecular Formula
Molecular Structure
Physical Properties
Molecular weight:73.1; Physical form:Colourless crystals, with a horseradish-like odour. Density:1.069 (37 °C); (, 1.0537) (40 °C); Composition:Tech. is >94.5% pure. Melting point:35-36 °C; (, 25.3-27.6 °C); Flash point:26.9 °C; Vapour pressure:2.13 (25 °C); Partition coefficient(n-octanol and water):logP = 1.37 ; pKa:12.3; Solubility:In water 8.2 g/l (20 °C). Readily soluble in common organic solvents, such as ethanol, methanol, acetone, cyclohexanone, dichloromethane, chloroform, carbon tetrachloride, benzene, xylene, petroleum ether, and mineral oils.; Stability:Unstable and reactive. Rapidly hydrolysed by alkalis, more slowly in acidic and neutral solutions, 50 85 h ( 5), 490 h ( 7), 110 h ( 9) (25 °C). Sensitive to oxygen and ;
Oral:Acute oral 50 for rats 72-220, mice 90-104 /. Percutaneous:Acute percutaneous 50 for rats 2780, male mice 1870, rabbits 263 /kg. Strongly irritating to eyes and skin (rabbits). Inhalation:50 (1 h) for rats 1.9 /l air. Phytotoxicity:Phytotoxic to all green plants.
Environmental Profile
Algae:50 (96 h) 0.248 /l; (96 h) 0.125 /l.Bees:Not hazardous to bees when used as directed.Birds:Acute oral 50 for mallard ducks 136 /kg. Dietary 50 (5 d) for mallard ducks 10 936, pheasants >5000 / diet.Daphnia:50 (48 h) 0.055/l.Fish:50 (96 h) for bluegill sunfish 0.14, rainbow trout 0.09, mirror carp 0.37-0.57 /l. 

Environmental fate: 
Soil:In damp soil, degradation and evaporation of the bulk of the substance occurs within 3 weeks at 18-20 °C soil temperature, 4 weeks at 6-12 °C, and 8 weeks at 0-6 °C. At the lower temperatures, leaching is more significant and is dependent on soil moisture
Transport Information
Signal Word:DANGER-POISON; Hazard Class:Ia(Extremely hazardous)

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