SULFUR DIOXIDE
SYNONYMS:
BISULFITE;
DIOXIDO de AZUFE (Spanish); EINECS No. 231-195-2; FERMENICIDE; SCHWEFELDDIOXYD
(German); STCC 4904290; SULFUROUS ACID ANHYDRIDE; SULFUROUS ANHYDRIDE; SULFUR
OXIDE; SULFUROUS OXIDE; SULPHUR DIOXIDE; SULPHUROUS ACID ANHYDRIDE; SULPHUROUS
ANHYDRIDE; SULPHUROUS OXIDE
IDENTIFICATION:
CAS:
7446-09-5
DOT ID:
UN1079
Hazard Class or Division:
2.3 (POISONOUS GAS)
ERG Guide:
125
Formula:
O2S
RTECS No:
WS4550000
Properties:
Nonflammable,
colorless, poisonous gas or compressed liquid [A liquid below 14°F (
!
10°C)].
Irritating, suffocating, pungent odor. Partly soluble in water forming
corrosive and toxic sulfurous acid. Vapors are heavier than air; will collect
in low areas.
Uses:
Sulfonation
of oils; in magnesium casting; solvent extraction of lubricating oils; cleaning
agent of metallic oxides; oxidizing agent in lithium primary batteries; leak
detector; metal mining/refining.
HEALTH & SAFETY INFORMATION
• IDLH:
100
ppm
•
OSHA Table Z-1 Air Contaminant
•
OSHA Process Safety Management of Highly Hazardous Chemicals (29CFR 1910.119,
Appendix A), Threshold Quantity: 1000 pounds
•
Poisonous. The gas causes severe irritation to the eyes, skin, and respiratory
tract. Skin and eye contact causes severe burns and blindness. Inhalation may
cause lung edema; the effects may be delayed. Rapid evaporation of the liquid
may cause frostbite. Exposure may affect the respiratory tract, causing
asthma-like reactions, reflex spasm of the larynx, respiratory arrest, and
death. Chronic inhalation exposure may cause asthma.
Exposure Limits:
•
ACGIH TLV: 2 ppm TWA; 5 ppm STEL
•
OSHA PEL: 5 ppm/13 mg/m3
•
NIOSH REL: 2 ppm/5 mg/m3 TWA; 5 ppm/13 mg/m3 STEL
•
DFG MAK: 0.5 ppm/1.3 mg/m3
Respirator:
At
any concentrations above the NIOSH REL, or where there is no REL, at any
detectable concentration:
SCBAF:PD,PP
(any self-contained breathing apparatus that has a full facepiece and is
operated in a pressure-demand or other positivepressure mode) SAF:PD,PP:ASCBA
(any suppliedair respirator that has a full facepiece and is operated in a
pressure-demand or other positive-pressure mode in combination with an
auxiliary self-contained breathing apparatus operated in a pressure-demand or
other positive-pressure mode).
Escape:
GMFOV
[any airpurifying, full-facepiece respirator (gas mask) with a chin-style,
front-or back-,mounted organic vapor canister] SCBAE (any appropriate
escape-type, selfcontained breathing apparatus).
Reactivity:
Contact
with water forms sulfurous acid; violent reaction with caustics, anhydrous
ammonia, and alcohols. Incompatible with aliphatic amines, alknolamines,
aromatic amines, amides, organic anhydrides, isocyanates, vinyl acetate,
alkylene oxides, and epichlorohydrin. Contact with copper, bronze, or alkali
metals may cause fire and explosions. Decomposes above 140°F (60°C), forming
toxic and corrosive oxides of sulfur. Aqueous solution attacks some plastics,
rubber, and coatings. Reacts with aluminum.
FIRE INFORMATION:
Fire fighting gear, including SCBA, does not provide adequate
protection. If exposure occurs, remove and isolate gear immediately and
thoroughly decontaminate personnel. Containers may explode in fire. If material
or contaminated runoff enters waterways, notify downstream users of potentially
contaminated water.
Hazard Classifications:
Health Hazard (Blue)
. . . . . . . . . . . . . . 3
Flammability (Red)
. . . . . . . . . . . . . . . 0
Reactivity (Yellow)
. . . . . . . . . . . . . . . . 0
FIRST AID:
Move
victim to fresh air. Call emergency medical care. Apply artificial respiration
if victim is not breathing. Do not use mouth-to-mouth method if victim ingested
or inhaled the substance; induce artificial respiration with the aid of a
pocket mask equipped with a one–way valve or other proper respiratory medical
device. Administer oxygen if breathing is difficult. Remove and isolate
contaminated clothing and shoes. In case of contact with liquefied gas, thaw
frosted parts with lukewarm water. Keep victim warm and quiet. Keep victim
under observation. Effects of contact or inhalation may be delayed. Ensure that
medical personnel are aware of the material(s) involved, and take precautions
to protect themselves.
ENVIRONMENTAL REGULATIONS
•
Clean Air Act: Accidental Release Prevention/Flammable substances, (Section 112[r],
Table 3), TQ = 5000 lb (2270 kg).
•
EPCRA Section 302 Extremely Hazardous Substances: TPQ = 500 lb (227 kg).
•
EPCRA Section 304: Reportable Quantity (RQ): EHS, 1 lb (0.454 kg).
•
DOT Inhalation Hazard
•
California LOL: ELMNP
•
WHMIS, Ingredients Disclosure List (Canada): 0.1%