GB
CAS No. 61562, 75-25-2
Molecular Formula CHBr₃
molecular 252.77

colorless liquid quality, taste like chloroform; vapor pressure of 2.67 kPa (48 ° C); melting point 6 to 7 ° C; boiling point of 149.5 ° C; solubility : Micro-insoluble in water, soluble in alcohol, ether, chloroform, benzene; densities right density (water = 1) 2.89; Stability : stability; risk Marker 14 (drugs); the main purposes : as solvents and organic synthesis intermediate

2, the impact on the environment :
case of alkali decomposition, but the water is highly persistent compounds are not biodegradable. Special drinking water will stay longer, thereby causing harm.

a health hazard

pathways : inhaled, ingested, percutaneous absorption.
health hazards : a narcotic goods and stimulate the role of a certain liver damage. A mild poisoning tears, itchy throat, dizziness, headache, inability. Severe nausea, vomiting, coma, convulsions, etc.. They can be deadly.

two, toxicology information and environmental behavior

toxicity : three with the toxicity of methyl bromide dichloromethane similar, but toxic than dichloromethane great intensity. It through the respiratory tract, oral serious harm to the human body, can also by the mucous membrane and eye to human skin or even serious toxic effects.
subacute and chronic toxicity : rats inhaled 0.25 mg / L, 4 hours / day, 2 months, liver and kidney dysfunction.
Mutagenicity : microbial mutagenicity : Salmonella typhimurium 50ul / plate.

pollution sources : three organic methyl bromide used for the synthesis of intermediates and drug manufacture. Use of methyl bromide as disinfectants, analgesics, refrigerant, fire chemicals businesses. More factories and businesses in the production and use of methyl bromide and three in the process of storage and transportation accidents are environmental hazards.

metabolism and degradation : Lucas in the rabbit test confirmed that the rectum or through inhalation of methyl bromide to give three, some in the liver was divided into metabolites, and then the rabbit's organizations and from the urine detection of inorganic bromides. Use of methyl bromide for three rectum anesthesia, can be recovered from the urine sodium bromide -. 3% -1.2%. The environment encountered three alkali decomposition of methyl bromide, but the water environment is highly persistent compounds are not biodegradable.

hazardous characteristics : Unburning. Heat generated by the decomposition of the toxic gas bromide. And lithium, potassium sodium alloy contacts violent reaction.
combustion (decomposition) products : carbon monoxide, carbon dioxide, hydrogen bromide.

3 site emergency monitoring methods :
rapid detection tube method; The portable gas chromatography "sudden environmental pollution monitoring and emergency treatment and disposal technologies," 10,000 < too editor / P>

4, laboratory monitoring methods :
monitoring methods source categories
Headspace GC GB/T17130-1997 water
Purge and Trap-GC China Environmental Monitoring Station water
GC "Solid Waste Assessment Test and Analysis Handbook" China Environmental Monitoring terminus translated solid waste
chromatography / mass spectrometry method of France and American EPA525 water

5, environmental standards :
former Soviet air workshop harmful substances maximum allowable concentration 5mg/m3
former Soviet air of harmful substances in the maximum allowable concentration 0.05mg/m3 (days average)
China (GHZB1-1999), surface water quality standard (I, II, Class III waters) 0.04mg / L

6, emergency treatment and disposal methods :

a leakage contingency

rapid withdrawal from air leakage personnel to a safe area, and isolation and strict restrictions on access. Cut off the fire source. A for methyl bromide in three of the soil and water pollution incidents in the light of the disposal technologies for chloroform.

happen on the ground of pollution incidents and disposal technologies are :
â‘?rapidly with soil, sand or other can take the material to build a dam to stop the flow of liquid, and particularly to prevent the flow of water near, the soil used to cover its absorption. Also in its mobile under the direction of a hole dug to its collection in the pit to prevent the proliferation of four, and then to the appropriate liquid collection containers.
â‘?the treatment process should not use wire (such as pig-iron ladles, iron containers, shovels, etc.), it should use other tools, because iron helps generate three decomposition of methyl bromide toxicity greater phosgene. If conditions are mature, operators in the treatment process should wear gas masks, or other protective equipment.
â‘?contaminated soil removal After stripping concentrate for processing. Operators should avoid light conditions.

2 when CHBr3 liquid water, should seek to block contaminated waters and other waters of the channel, its methodology for building dams to stop it flows; Ditching it flows to another body of water (such as the outfall) and so on. Methyl bromide is due to three volatile category halohydrocarbon of contaminated water to deal with the most convenient method is to use aeration (including deep into the aeration), it rapidly from the water dispersion of the atmosphere. In addition, several soil treatment method can also be used, where appropriate.

two protective measures

respiratory protection : concentration in air overweight, should choose to wear self-absorption filter respirators (half-mask). Emergency rescue or evacuation, wearing oxygen respirator.
eye protection : Most do not need special protection, high concentrations can be contacted wearing protective glasses.
physical protection : gas-penetrating protective clothing.
hand protection : Wear gloves against chemicals.
other : work site prohibit smoking, eating and drinking. Work completed, take a bath. Separate storage of toxic pollution were the clothes. Washed standby.

three, and emergency measures

contact with the skin : stripped of contaminated clothing, use soap and water thoroughly washed skin.
eye contact : Did eyelid, mobile or saline irrigation water and medical treatment.
Inhalation : rapidly from the scene to fresh air. To keep the airway patency. If breathing is difficult, give oxygen. If breathing stop immediately mouth. Medical treatment. Fresh into
: warm water to drink enough, the symptoms and to seek medical treatment.

fire fighting methods : firefighters are required to wear gas masks, body wear firefighting suits. Extinguishant : foam, powder, CO2, sand.