GB No. 23020
CAS No. 7783-61-1
Molecular Formula SiF₄
molecular 104.06

2. The impact on the environment :
a health hazard

pathways : inhalation.
health hazards : This eye, skin, mucous membrane and serious respiratory damage. Localized corrosion powerful. Severe poisoning can be induced pneumonia, pulmonary edema.

two, toxicology information and environmental behavior

toxicity : it is a high toxicity.
acute toxicity : LC₅₀1275mg/m3 (rat inhalation)
hazardous characteristics : moist air produced a white corrosive and irritating fumes of hydrogen fluoride. Violent reaction with water to form acid and hydrogen fluoride.
combustion (decomposition) products : hydrogen fluoride.

3. Emergency Monitoring Methods :
speed test tube; Ion selective electrode

4. Laboratory monitoring methods :
ion selective electrode (GB7484-87, water)
membrane fluoride ion selective electrode (GB/T15434-95, air) k

5. Environmental standards :
China (TJ36-79) Workshop harmful substances in the air that the maximum allowable concentration 1mg/m3 [F]
China (TJ36-79) Residential District of harmful substances in the atmosphere the maximum allowable concentration (fluoride) 0.02mg/m3 (a value); 0.007mg/m3 (days average)
China (GB5048-92), irrigation water quality standards (fluoride) 2.0-3.0mg / L (water and dry vegetables)
Chinese (GB11607-89) Fisheries water quality standards 1 mg / L (fluoride)
China (GB5749-85) health standards for drinking water 1.0 mg / L (fluoride)
China (GB/T14848-93) groundwater quality standards (mg / L) Class I 1.0; Type II 1.0; Class III 1.0; category IV 2.0; category V 2 .0 above (fluoride)
China (GHZB1-1999), surface water quality standard (mg / L) of the following Class I 1.0; Type II 1.0; Class III 1.0; category IV 1.5; category V 1.5 (fluoride)
China (GB8978-1996) sewage discharge standards (mg / L), a 10; two 10 ~ 20; three 20 ~ 30 (fluoride)
China ( GB5058.3-1996), solid waste leaching toxic identification standard value of 50 mg / L (fluoride)

6. Emergency treatment and disposal methods :
a leakage contingency

rapid withdrawal of staff from air leakage supremacy wind, and immediately quarantine 450 meters and strictly restricted. Recommended emergency personnel wearing self-Pressurized respirators to wear protective clothing. Upwind from entering the scene. As far as possible, cut off the source of leakage. A reasonable ventilation, accelerated proliferation. Spray-foam or water cooling and dilution steam, the protection of the field. To build a causeway or trenching asylum produce a lot of wastewater. Leak containers should be properly handled, repair, testing later use.

two protective measures

respiratory protection : concentration in air overweight, 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 : wear protective clothing sealed.
hand protection : Wear rubber gloves.
other : no smoking scene work. To maintain good health habits.

three, and emergency measures

contact with the skin : stripped of contaminated clothing, mobile water rinse. 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.

fire fighting methods : fire officers must wear body fire protective clothing. Cut off the gas source. Cooling water containers, if possible to move containers from the scene empty Department. Extinguishant : atomised water, dry, sandy soil.