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Wi.Tec-Sensorik · The Gas Measurement Company
SO₂ – General Information, SO₂ Gas Sensors & Relevant Applications
Sulfur dioxide (SO2) is a colorless, mucous membrane-irritating, pungent-smelling and sour-tasting toxic gas. Discover all the info about this gas and about the SO2 sensors from Wi.Tec-Sensorik ...
General information on SO₂ / Sulfur dioxide
Sulphur dioxide (SO₂) is a colorless, pungent smelling gas consisting of sulphur and oxygen. It is mainly produced during the combustion of sulphur-containing fossil fuels such as coal and oil, as well as during volcanic activity. In the atmosphere, SO₂ can contribute to acid rain as it can convert to sulphuric acid with water. It is also known as an air pollutant that can cause respiratory illnesses and plays a significant role in air pollution.
Properties of sulphur dioxide (SO₂)
Please note that these properties can change depending on pressure and temperature.
- Molecular weight: The molecular weight of SO₂ is about 64.07 g/mol.
- Boiling point: The boiling point of SO₂ is -10.02 degrees Celsius (14 degrees Fahrenheit) under normal pressure.
- Melting point: The melting point is -72.7 degrees Celsius (-98.9 degrees Fahrenheit) at a pressure of 1 atmosphere.
- Density: The density of SO₂ varies with pressure and temperature. At room temperature and normal pressure, the density is approximately 2.63 kg/m³.
- Physical state: SO₂ is a gas at room temperature and normal pressure.
- Solubility in water: SO₂ is very soluble in water, about 11.3 g/l at 0 degrees Celsius and about 7.8 g/l at 20 degrees Celsius.
- Odor and taste: SO₂ has a pungent, irritating odor; it is not suitable for consumption.
- Thermal conductivity: The thermal conductivity of SO₂ is about 0.0103 W/(m-K) at 25 degrees Celsius.
- Critical point: The critical point of SO₂ is at a temperature of 157.2 degrees Celsius and a pressure of 7.88 MPa.
Application examples for SO₂
- Food industry: Sulphur dioxide is used as a preservative (E220) in dried fruit, wine and other foods to prevent the growth of bacteria and mold.
- Paper and textile industry: SO₂ is used as a bleaching agent to brighten textiles and paper.
- Chemical industry: SO₂ is used as a starting material for the production of sulphuric acid (H₂SO₄), one of the most important industrial chemicals.
- Environmental technology: It is used in flue gas cleaning to remove sulphur compounds from exhaust gases and thus reduce air pollution.
- Wine production: SO₂ is used as an antioxidant and to sterilize wine barrels and bottles to protect the wine from oxidation and microbial damage.
- Refrigeration industry: Sulphur dioxide was previously used as a refrigerant before being replaced by safer alternatives.
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Gas sensors from Wi.Tec-Sensorik for the precise measurement of SO₂
Overview Products and Measurement Ranges
| Measuring range (*) | |||||||||||
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| 100 Vol.% | 30 Vol.% | 10 Vol.% | 5 Vol.% | 1 Vol.% | 5,000 ppm | 1,000 ppm | 500 ppm | 100 ppm | 50 ppm | 1 ppm | |
| SO₂ | No items found | No items found |
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Some relevant Applications to SO₂
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