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Sulfur Dioxide

Gas Name:

Sulfur Dioxide

Chemical Formula:

SO₂

Synonyms:

Sulfurous Acid Anhydride, E220

Product Uses, Sources & Applications

Sulfur dioxide is a gas which is used in a number of applications including:

Preservative – particularly for dried fruits
Anti-microbial and antioxidant in winemaking
Bleaching agent for paper and textiles
Neutralizing agent for chlorine in water and waste water facilities
Until the development of HFCs and CFCs, sulfur dioxide was used extensively as a refrigerant, particularly in home refrigerators

Hazards

Toxicity

Short Term (15-minute STEL*):

5

ppm

Long-term (8-hr TWA*):

3

ppm

*Based on OSHA regulation. Always consult local regulations directly.

Flammability

Lower Explosive Limit (LEL):

n/a

NIOSH Pocket Guide:

View pocket guide

Physical Properties

Appearance and Odor:

Colorless gas with an irritating, pungent odor

Relative Density (air = 1.0):

2.263

Recommendations

Sensor Type:

Electrochemical Diffusion Type

Standard Range:

0-10 ppm

Standard Trip Points:

3 ppm, 5 ppm

Recommended Sensor Mounting Height:

12 – 18 inches AFF.

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