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Sulfur dioxide(7446-09-5)

Sulfur dioxide(7446-09-5)
Product IdentificationBack to Contents
【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 PropertiesBack to Contents
【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 MeasuresBack to Contents
【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 StorageBack to Contents
【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 IdentificationBack to Contents
【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 ProtectionBack to Contents
【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 MeasuresBack to Contents
【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 MeasuresBack to Contents
【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 ReactivityBack to Contents
【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 InformationBack to Contents
【UN Number】

1079
【Hazard Class】

2.3
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