GB No. 31012
CAS No. 78-75-9
Molecular Formula C₅H₈; CH₂ CHC = = (CH₃) CH₂
molecular 68.11
a colorless and volatile liquid; vapor pressure 53.32kPa/15.4 ° Cflash point : -54 ° C; boiling point -146.7 ° C temperature : 34.0 ° C; do not dissolve in water, soluble in alcohol, ether, etc. Most organic solvents; the relative density (water = 1 ) 0.68; the relative density (Air = 1) 2.35; Stability : stability; hazard markers : 7 (low flash point flammable liquids); the main purposes : the organic chemicals, used for synthetic rubber, butyl rubber monomer

2. The impact on the environment :
a health hazard

pathways : inhaled, ingested, percutaneous absorption.
health hazards : a narcotic goods and stimulating effect.
acute poisoning : a high-concentration inhaled, can quickly headache, dizziness, disorientation, weakness, nausea, eye pain, the tears, sneezing, sore throat, cough, chest tightness or difficulty breathing. There central nervous system shortly before anesthesia excited symptoms, such as irritability, crying loudly, muscle twitch, tremor; Serious coma. Normally after a few hours gradually clear. Usually without sequelae. The onset of skin edema and hyperemia, and thereafter a mild exfoliation. To be absorbed by the skin integrity.

two, toxicology information and environmental behavior

toxicity : is low toxicity category.
acute toxicity : LC₅₀180000mg/m3, 4 hours (rat inhalation)
subacute and chronic toxicity : rats, mice, rabbits chronic toxicity manifested as : changes in the central nervous system , liver function changes. Animals were killed autopsy found a card he exfoliative bronchitis, some of purulent bronchitis. Rats hyperthyroidism reaction.
Mutagenicity : micronucleus test : mice inhaled 438ppm (6 hours), 12 days (consecutive). Sister chromatid exchange : mouse inhalation 438ppm (6 hours), 12 days (consecutive).

hazardous characteristics : its vapor and air can form explosive mixtures. Case of fire, explosion fever burns easily. With oxidants, fuming sulfuric acid, nitric acid, sulfuric acid, chlorosulfonic acid reaction intense contacts. In case of high fever, can occur polymerization reaction and emit heat and large containers ruptured and caused the explosion. Its vapor is heavier than air, will spread to the lower Department of considerable local and met the fire will generate a return to burning.
combustion (decomposition) products : carbon monoxide, carbon dioxide.

3. Emergency Monitoring Methods :

4. Laboratory monitoring methods :
chromatography-mass spectrometry
GC, in the light "Manual of Analytical Chemistry" ( the fourth division, chromatography analysis), the chemical industry publishers

5. Environmental standards :
former Soviet air workshop harmful substances maximum allowable concentration 40mg/m3
the former Soviet Union (1975) Harmful Substances in Water maximum allowable concentration of 0.005 mg / L
olfactory threshold concentration 10mg/m3

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. Recommended emergency personnel wearing respirators-positive pressure self-sufficiency, wearing fire protective clothing. As far as possible, cut off the source of leakage. Preventing access to sewers, flood discharge trench so restrictive space. A small leak : activated carbon or other inert materials to absorb. We could also use non-flammable dispersant made of latex, wash, lotion diluted Add to the wastewater system. Large leak : to build a causeway or trenching asylum; Foam coverage, lower vapor disasters. Ex pump used to transfer tankers or exclusive collector, recycling or shipped to the disposal of waste disposal sites.

two protective measures

respiratory protection : concentration in air overweight, wearing a gas mask filter type (half-mask).
eye protection : when necessary, wearing chemical protective safety glasses.
physical protection : antistatic wear uniforms.
hand protection : Wear rubber gloves.
other : no smoking scene work. To avoid long-term repeated exposure.

three, and emergency measures

contact with the skin : stripped of contaminated clothing and spend a lot of flushing water flow at least 15 minutes. Medical treatment.
eye contact : immediately filed eyelid, with a large number of mobile water or saline thoroughly washed at least 15 minutes. 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 : as far as possible to move containers from the scene empty Department. Cooling water containers inside until the end of fire. At the scene of containers, if any, change from the pressure relief safety devices have voices must evacuate immediately. Extinguishant : foam, powder, CO2, sand. Water fire invalid.