CAS No. 21039, Molecular Formula C2H4O
colorless gas; Vapor Pressure : 145.91kPa/20 ° C Flash point : <-17.8 ° C / issuer Cup; Melting point -112.2 ° C; The boiling point of 10.4 ° C; Solubility : soluble in water, the majority organic solvent; density : relative density (water = 1) 0.87; the relative density (Air = 1) 1.52; Stability : unstable; hazard markers : 4 (flammable gases); the main purposes : for the manufacture of ethylene glycol, Surfactant , detergents, plasticizers and resins, etc.
2. The impact on the environment :
a health hazard
pathways : inhalation, skin absorption.
health hazards : a central nervous inhibitors, stimulants and puree poison.
acute poisoning : patients are keen pulsating headache, dizziness, nausea and vomiting, tears, irritating cough, chest tightness, difficulty in breathing; Severe muscle trembling body, speech disorder, ataxia, sweating and confusion, resulting in a coma. Still visible myocardial damage and abnormal liver function. The rescue resumed after a temporary mental disorders, delayed sexual function Aphonia or central hemiplegia. Contact with the skin rapidly swelling, a few hours after the blister, repeated exposure can be sensitized. Spills pleasant to the eye, corneal burns can be.
chronic effects : Few long-term contacts, see a neurasthenic syndrome and autonomic dysfunction.
two, toxicology information and environmental behavior
toxicity : It is a middle class drug.
acute toxicity : LD50330mg/kg (rat oral); LC502631.6mg/m3 × 4 hours (rat inhalation); Inhalation 250ppm × 60 minutes, serious poisoning; inhalation 100ppm, the case of a harmful symptoms; inhalation> 10ppm, insecurity.
irritation : a rabbit eyes : 18 mg (6 hours), moderate stimulus. Percutaneous were : 1%, 7 seconds, skin irritation.
subacute and chronic toxicity : rats inhaled 0.64g/m3, 7 hours / times, seven times after secondary pulmonary infection, causing death. Mice and moderate weight loss, severe lung damage.
mutagenicity microsomal Mutation : Salmonella typhimurium 20ppm, microbial mutagenicity : beer yeast 25mmol / L. Sister chromatid exchange : 4pph human lymphocytes.
reproductive toxicity : rat inhalation poisoning minimum concentration (TCL0) : 3,600 µ g/m3, 24 hours (60 days, male), the impact of testis, epididymis and vas deferens. Pre-implantation induced a high mortality rate. Inhalation poisoning rats minimum concentration (TCL0) : 150ppm (7 hours and progesterone drug 7-16 days), resulting embryo toxicity induced craniofacial abnormalities, cause musculoskeletal abnormalities.
cancer : IARC carcinogens comments : human carcinogen.
hazardous characteristics : its vapor with air to form a broad range of explosive mixture. Case heat and the fire is burning a risk of explosion. In case of high fever can be dramatic decomposition of container rupture or explosion. Contact with alkali metals, hydroxides or high-activity catalyst like iron, tin and aluminum chloride anhydrous aluminum and iron oxides and the extensive heat, and may cause an explosion. Which 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 :
portable gas chromatography; Gas detection tube method
gas velocity measurement tube (Germany Del products)
4. Laboratory monitoring methods : gas chromatography
"air toxic substances Determination" (second edition), edited Hang Shi-ping
Chromotrope colorimetry "air toxic substances Determination" ( the second edition), Hang Shi-ping editor
5. Environmental standards :
China (TJ36-79) Workshop harmful substances in the air that the maximum allowable concentration 5mg/m3
the former Soviet Union (1975) neighborhood atmosphere of harmful substances maximum allowable concentration% / m3 (diurnal average)
6. Emergency treatment and disposal methods :
a leakage contingency
rapid withdrawal of staff from air leakage supremacy wind, and immediately quarantine of 150 meters and strictly restricted. 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. Using industrial coating or adsorption / absorbent cover near the leaking sewer, and other gases to prevent access. A reasonable ventilation, accelerated proliferation. Spray - diluted solution. To build a causeway or trenching asylum produce a lot of wastewater. If possible, use exhaust gas leakage sent an open area for the installation of appropriate nozzle or burned. Leak containers should be properly handled, repair, testing later use.
waste disposal methods : the waste is non-peroxide solution concentrated on the control of the speed of combustion. Peroxide-containing waste by enrichment, in a safe distance from the mouth open burning.
two protective measures
respiratory protection : air concentrations exceeding the recommended wearing self-absorption filter respirators (full cover). Emergency rescue or evacuation, it is recommended to wear air respirators.
eye protection : Respiratory Protection has been protective.
physical protection : antistatic wear uniforms.
hand protection : Wear rubber gloves.
other : no smoking scene work. Work to complete, take a shower. Pay attention to personal hygiene.
three, and emergency measures
contact with the skin : immediately stripped of contaminated clothing, with a large number of mobile wash, 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 the heartbeat stopped breathing, and immediately mouth of thoracic cardiac massage. Fresh into
: coverage immediately mouthwash, or egg white blues. Medical treatment.
fire fighting methods : cut off of gas supply. If not immediately cut off the gas supply, it is not extinguished combustion gases. Cooling water containers, if possible to move containers from the scene empty Department. Extinguishant : mist, anti-insoluble bubble, dry powder, carbon dioxide.
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