Hydrogen Sulphide (H2S)

Pollutants - Other - H2S



AirQuality Limited can offer three options for the monitoring of ammonia including:

  • Electrochemical monitoring
  • Heated metal oxide (HMO) sensor technology
  • Canister sampling

More detail on each of these options is shown below:

Electrochemical Monitoring

These cost-effective instruments use electrochemical sensors to detect hydrogen sulphide and can reliably measure down to around 10ppb. Our monitors are configured to send the information to either a secure on-line database where the data and diagnostic information can be displayed or the clients own database for in-house reporting purposes.

Heated Metal Oxide Sensors

These instruments measure total reduced sulphide concentration including hydrogen sulphide and is calibrated down to 3ppb. Airquality produces a combined device which includes both HMO and EC sensors to detect H2S and TRS and is very useful for assessing odour from water treatment plants as it can distinguish between and very selective and does not suffer from the cross sensitivity that The monitor can be configured to The results can be displayed.


Pricing is dependent upon:

  • The length of time you wish to monitor for
  • The type of equipment you wish to use
  • Whether you wish to purchase or rent the monitoring instrumentation
  • The level of data validation and reporting
  • Whether an instrument enclosure is required
  • Whether mains or solar powered options are required
  • Whether meteorological monitoring is also required

Our clients tell us that we offer very competitive quotes for both the supply and operation of these instruments.

Contact us today for an obligation free quote!


Hydrogen sulfide (British English: hydrogen sulphide, but this spelling is not recommended by the International Union of Pure and Applied Chemistrynor the Royal Society of Chemistry) is the chemical compound with the formula H2S. It is a colorless gas with the characteristic foul odor of rotten eggs; it is heavier than air, very poisonous, corrosive, flammable and explosive.

Hydrogen sulfide often results from the bacterial breakdown of organic matter in the absence of oxygen, such as in swamps and sewers; this process is commonly known as anaerobic digestion. H2S also occurs in volcanic gases, natural gas, and some well waters. The human body produces small amounts of H2S and uses it as a signaling molecule.

Dissolved in water, hydrogen sulfide is known as hydrosulfuric acid or sulfhydric acid, a weak acid.

Swedish chemist Carl Wilhelm Scheele is credited with having discovered hydrogen sulfide in 1777.