Detecting Sulphur Dioxide

Detecting Sulphur Dioxide


Sulphur Dioxide

Formula: SO₂


CAS Number: 7446-09-5



Sulphur Dioxide (SO₂) is a colourless gas with a pungent odour, often described as resembling the smell of burnt matches. It is produced through both natural processes, such as volcanic eruptions and the decay of organic matter, and human activities, primarily combustion of sulphur-containing fuels and industrial processes. SO₂ has diverse industrial applications but is also a significant air pollutant with environmental and health implications.


This toxic gas is primarily produced through the combustion of sulphur-containing fuels, such as coal and oil, in industrial processes like power generation and metal smelting. It is also generated during the roasting of sulphide ores and the production of sulphuric acid. Additionally, volcanic eruptions and natural decomposition processes release SO₂ into the atmosphere.


In the chemical industry, SO₂ is an important precursor for making sulphuric acid (H2SO4), which is a commonly used industrial chemical. Sulphuric acid has diverse applications, including in fertilisers, chemical synthesis, and battery manufacturing.

Food Industry:

Sulphur Dioxide is used as a preservative in the food industry to inhibit microbial growth, prevent spoilage, and maintain the colour and flavour of certain foods, such as dried fruits and wine.

Water Treatment:

Employed in water treatment processes, SO₂ is used to remove excess chlorine and chlorine dioxide, as well as to control pH levels.


Sulphur Dioxide is a useful gas in industry, but it can harm people and the environment when released into the air. Sustainable management practices, technological innovations, and regulatory measures are essential to minimise sulphur dioxide emissions and mitigate their impact on air quality and ecosystems.


Recommend Products for Sulphur Dioxide


Midas S2 Fixed Gas Detector

The Midas S2 has a compact form factor that is suitable for use in tight spaces. The highly modular design enables easy, trouble-free installs and servicing.

Additionally, the Midas is also a gas detector that can be fixed in one place. It works by drawing a sample of gas from a nearby or remote location to a sensor cartridge.

For more information on Midas S2 Fixed Gas Detector, click here: Midas S2 Fixed Gas Detector | Gas Detection Systems (


BW Solo Single Gas Detector

The Honeywell BW Solo is a portable, single-gas detector designed to keep workers safe in hazardous environments. It is easy to use, works well, and is simple to maintain, making it useful for many different industries.” You can download data onto your PC and manage it using Honeywell software, which is designed to automate important compliance tasks. Expertly designed to accommodate 14 distinctly different gas types including ammonia.

For more information on the BW Solo Single Gas Detector, click here:

BW Solo Single Gas Detector | Honeywell Gas Detector with connectivity. (


Crowcon XgardIQ Fixed Gas Detector Transmitter

The Crowcon XgardIQ Fixed Gas Detector is designed to decrease the amount of time users are in hazardous areas. It offers a new safety solution.

This intelligent fixed-point gas detector is compatible with the full range of Crowcon sensor technologies. The device uses sensor modules that are easy to change, test, and adjust quickly, saving the user time in dangerous situations.

This device has a bright screen that shows information, and bright lights show status quickly.” If the system detects any abnormal conditions, it will flash the LEDs and display a warning message. For more information on the Crowcon XgardIQ Fixed Gas Detector Transmitter, click here: Crowcon XgardIQ Fixed Gas Detector – (S1/S2) | Rockall Safety




For more information on Sulphur Dioxide, download the gas fact sheet here: Detecting Sulphur Dioxide


Written by Rhys Redrup

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