Supplier Product Identification Physical and Chemical Properties First Aid Measures Handling and Storage Hazards Identification Exposure Controls/Personal Protection Fire Fighting Measures Accidental Release Measures Stability and Reactivity Transport Information
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Sulfur dioxide(7446-09-5)

Supplier Product Identification Physical and Chemical Properties First Aid Measures Handling and Storage Hazards Identification Exposure Controls/Personal Protection Fire Fighting Measures Accidental Release Measures Stability and Reactivity Transport Information

Product Identification

Product Name
Sulfur dioxide
Synonyms
Sulfur oxide
Sulfurous anhydride
CAS
7446-09-5
Formula
O2(32)S
Molecular Weight
64.05
EINECS
231-195-2
RTECS
WS4550000
RTECS Class
Agricultural Chemical and Pesticide; Tumorigen; Mutagen; Reproductive Effector; Human Data; Primary Irritant
Merck
12,9144
Beilstein/Gmelin
1443 (G)
EC Index Number
016-011-00-9
EC Class
Toxic; Corrosive

Physical and Chemical Properties

Appearance
A colorless gas with a choking or suffocating odor.
Solubility in water
8.5 g/100 mL (20 C)
Melting Point
-75.7
Boiling Point
-10.3
Vapor Pressure
43.7 (-60 C)
Density
1.434 g/cm3 (20 C)
Heat Of Vaporization
25.4 kJ/mol
Usage
Preserving fruits, disinfectant in breweries & food factories.
Vapor Density
2.2
Odor threshold
0.47 ppm
Refractive Index
1.3047 (20 C)

First Aid Measures

Ingestion
Seek medical assistance.
Inhalation
Move victim to fresh air. 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. Effects may be delayed.
Skin
Rewarming and a variety of topical treatments are indicated for frostbite injury. See main treatment section for more information.
Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Handling and Storage

Storage
Protect against physical damage, store outdoors or in a well ventilated area of noncombustible construction.
Handling
Containers of this material may be hazardous when emptied. Since emptied containers retain product residues (vapor, liquid, and/or solid), all hazard precautions given in the data sheet must be observed.

Hazards Identification

Inhalation
Vapors are extremely irritating and corrosive.
Skin
Direct contact with liquefied sulfur dioxide could cause frostbite injury.
Eyes
See Skin.
Ingestion
Nausea, vomiting, and abdominal pain have been reported.
Hazards
Containers may explode in heat of fire or they may rupture and release irritating toxic sulfur dioxide. Sulfur dioxide has explosive properties when it comes in contact with sodium hydride; potassium chlorate at elevated temperatures; ethanol; ether; zinc ethylsulfurinate at very cool temperatures (-15C); fluorine; chlorine trifluoride and chlorates. It will react with water or steam to produce toxic and corrosive fumes. When the liquid is heated it may release irritating, toxic sulfur dioxide gas.
UN (DOT)
1079

Exposure Controls/Personal Protection

Personal Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Exposure Effects
Maternal toxicity and embryotoxicity have been observed.
Exposure limit(s)
OSHA PEL: TWA 5 ppm (13 mg/m3) NIOSH REL: TWA 2 ppm (5 mg/m3) ST 5 ppm (13 mg/m3) NIOSH IDLH: 100 ppm
Poison Class
3

Fire Fighting Measures

Fire Fighting
Wear self-contained breathing apparatus and full protective clothing. Move container from fire area. Stay away from ends of tanks. Cool containers that are exposed to flames with water from the side until well after the fire is out. Isolate area until gas has dispersed. Keep unnecessary people away.Not flammable. Extinguish fires with dry chemical, carbon dioxide, water spray, fog or foam.
Fire Potential
Nonflammable.

Accidental Release Measures

Small spills/leaks
Keep material out of water sources and sewers. Attempt to stop leak if without undue personnel hazard. Use water spray to knock-down vapors. Neutralize spilled material with crushed limestone, soda ash, or lime. Do not use water on material itself.

Stability and Reactivity

Incompatibilities
Reacts exothermically with bases such as amines, amides, metal oxides, and hydroxides Reacts explosively with fluorine. Avoid ammonia, monocesium or monopotassium acetylide; dicesium monoxide; iron (II) oxide; tin oxide; lead (IV) oxide; chromium; manganese; molten sodium, powder aluminum and rubidium. Sulfur dioxide has explosive properties when it comes in contact with sodium hydride; potassium chlorate at elevated temperatures; ethanol; ether; zinc ethylsulfurinate at very cool temperatures (-15C); fluorine; chlorine trifluoride and chlorates. It will react with water or steam to produce toxic and corrosive fumes.
Stability
Stable.
Decomposition
Sulfur compounds.

Transport Information

UN Number
1079
Hazard Class
2.3
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