GB No. CAS US> No. 7440-59 -7
Molecular Formula He
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odorless and colorless inert gas; Vapor Pressure 202. 64kPa (-268.9 ° C); melting point -272.1 ° C; boiling point -268.9 solubility : not soluble in water, ethanol; density : relative density (water = 1) 0.15 (-271 ° C); the relative density (Air = 1) 0.14; Stability : stability; risk Marker 5 (Unburning gases); the main purposes : for balloons, thermometer, tube, diving suits and other inflatables
2. The impact on the environment :
a health hazard
pathways : inhalation.
health hazards : Cymbalta inert gases, high concentrations can reduce the partial pressure of oxygen and are a choking hazard. When air helium concentration increased, the patient comes first accelerated respiration, distractibility, ataxia; There followed unable to fatigue, irritability, nausea, vomiting, coma, convulsions and even die.
two, toxicology information and environmental behavior
hazardous characteristics : In case of high fever, increased pressure within containers, cracking and the risk of explosion.
3. Emergency Monitoring Methods :
4. laboratory monitoring methods : gas chromatography
reference to the "Handbook of Analytical Chemistry" (fourth volumes, chromatography analysis), the chemical industry publishers
5. Environmental standards :
American plant health standards asphyxiating gas
6. Emergency treatment and disposal methods :
a leakage contingency
rapid withdrawal of staff to leak contaminated areas upwind, isolation and strict restrictions on access. Recommended emergency personnel wearing respirators-positive pressure self-sufficiency, wearing overalls general operations. As far as possible, cut off the source of leakage. A reasonable ventilation, accelerated proliferation. If possible, use immediately. Leak containers should be properly handled, repair, testing later use.
two protective measures
respiratory protection : general need special protection. When air operations oxygen concentrations below 18%, the air must wear respirators, oxygen respirator mask or long pipe.
eye protection : general need special protection.
physical protection : general operating wear uniforms.
hand protection : Wear protective gloves general operations.
other : avoid high concentrations of respirable. Enter cans, or other restrictive space of high concentration operations, someone custody.
three, and emergency measures
Inhalation : rapidly to the scene from the air fresh air. To keep the airway patency. If breathing is difficult, give oxygen. Stop breathing, artificial resuscitation immediately. Medical treatment.
fire fighting methods : This Unburning. Cut off the gas source. Cooling water containers, if possible to move containers from the scene empty Department.
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