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Chemical Identification
Common Name
Methyl bromide
中文通用名
溴甲烷
IUPAC
methyl bromide
or
bromomethane
CAS
bromomethane
CAS No.
[74-83-9]
Molecular Formula
CH3Br
Molecular Structure
Physical Properties
Molecular weight:94.9; Physical form:Colourless, odourless gas at room temperature. Chloroform-like odour at high concentrations. Density:1.732 (0 °C); Melting point:-93 °C; Flash point:Non-flammable; Vapour pressure:190 (20 °C); Henry constant:1.03 × 103 Pa m3 mol-1 ; Solubility:In water 17.5 g/l (20 °C); it forms a crystalline hydrate with ice-water. Readily soluble in most organic solvents, e.g. lower alcohols, ethers, esters, ketones, aromatic hydrocarbons, halogenated hydrocarbons, and carbon disulfide.; Stability:Hydrolysed very slowly in water, and more rapidly in alkaline media.;
Toxicology
(Rat): Oral LD50 100 mg/kg. Inhalation LC100 0.063 mg/l (15 min.); 302 ppm (8 h). Methyl bromide is a poison and can cause respiratory distress, cardiac arrest, and central nervous system effects. Overexposure may cause neurotoxic effects from which recovery may be slow. Methyl bromide demonstrates genotoxicity in several test systems at levels above the TLV. In 2 year inhalation cancer bioassay with rats at 3, 30, 90 ppm, no tumors observed. In 2 generation inhalation repr
Environmental Profile
Ecotoxicology: 
Bees:Not hazardous to bees when used as directed.Birds:Acute oral 50 for bobwhite quail 73 /.Daphnia:50 (48 h) 2.6 /l.Fish:50 (96 h) 3.9 /l. 

Environmental fate: 
Animals:Metabolism not totally elucidated; inorganic bromide ion is formed.Soil:Residues of bromide ion and methyl bromide in soils fumigated with the latter, and their effects were reviewed by G. A. Maw & R. J. Kempton (Soils Fert., 1973, 36, 41).Plant:Metabolism not totally elucidated; inorganic bromide ion is formed.WATER SOLUBILITY: 1.75 g/100g at 20°C
Transport Information
Signal Word:DANGER; Hazard Class:Ib(Highly hazardous)

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