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Sulfur dioxide Structure

Sulfur dioxide

Chemical Properties

Melting point -73 °C (lit.)
Boiling point -10 °C (lit.)
Density  1.25 g/mL at 25 °C (lit.)
vapor density  2.26 (21 °C, vs air)
vapor pressure  1779 mm Hg ( 21 °C)
form  colorless gas
Odor Pungent odor detectable at 0.3 to 5 ppm
Odor Threshold 0.87ppm
Water Solubility  %H2O: 17.7 (0°C), 11.9 (15°C), 8.5 (25°C), 6.4 (35°C); % other solvents: 25, alcohol; 32, methanol [MER06]
Merck  13,9061
BRN  3535237
Exposure limits TLV-TWA 2 ppm (~5 mg/m3) (ACGIH), 5 ppm (OSHA and MSHA); IDLH 100 ppm (NIOSH).
Stability Stable. Non-corrosive when dry to common materials except zinc; corrosive when wet. Incompatible with strong reducing or oxidizing agents, moisture, zinc and its alloys.
Substances Added to Food (formerly EAFUS) SULFUR DIOXIDE
FDA 21 CFR 182.3862; 582.3862
CAS DataBase Reference 7446-09-5(CAS DataBase Reference)
SCOGS (Select Committee on GRAS Substances) Sulfur dioxide
EWG's Food Scores 1-2
IARC 3 (Vol. 54) 1992
Proposition 65 List Sulfur Dioxide
NIST Chemistry Reference Sulfur dioxide(7446-09-5)
Pesticides Freedom of Information Act (FOIA) Sulfur dioxide
EPA Substance Registry System Sulfur dioxide (7446-09-5)


Signal wordDanger
Hazard statements H280-H314-H331
Precautionary statements P260-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338-P410+P403
Hazard Codes  T
Risk Statements  23-34
Safety Statements  9-26-36/37/39-45
RIDADR  UN 2037 2.3
WGK Germany  1
RTECS  WS4550000
DOT Classification 2.3, Hazard Zone C (Gas poisonous by inhalation)
HazardClass  2.3
Hazardous Substances Data 7446-09-5(Hazardous Substances Data)
Toxicity LC50 inhal (rat) 2520 ppm (6590 mg/m3; 1 h)
LCLO inhal (human) 1000 ppm (2600 mg/m3; 10 min)
PEL (OSHA) 5 ppm (13 mg/m3)
TLV-TWA (ACGIH) 2 ppm (5.2 mg/m3)
STEL (ACGIH) 5 ppm (13 mg/m3)
IDLA 100 ppm
NFPA 704:
3 0

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