Nitric acid is manufactured from ammonia and is a key chemical in the manufacture of fertilizers. This is the main reason why nitric acid is produced in such large quantities. The production process of nitric acid produces nitrogen oxides (NOx), ammonia (NH3) and nitrous oxide N2O emissions. Read about our solutions to the chemical industry!

NOx, NH3 and N2O emissions

Nitric acid is most commonly produced by Ostwald process. The process converts ammonia to nitric acid in two steps. During the first step ammonia is oxidized to form nitric oxide (NO) and nitrogen dioxide (NO2). During the second step, the nitrogen dioxide that was formed is absorbed in water. This, in turn, forms nitric acid. During this process NOx, NH3 and N2O emissions are produced.

Nitrogen oxides and ammonia are harmful to the environment and toxic to humans. Nitrogen oxides are a group of seven gases and compounds composed of nitrogen and oxygen. The two most common and hazardous nitrogen oxides are nitric oxide and nitrogen dioxide. Ammonia on the other hand is a compound of nitrogen and hydrogen.

Nitrous oxide, commonly called laughing gas, is a strong greenhouse gas that contributes to climate change.

Emission Abatement

The ability to detect and measure almost any gas (including NOx, NH3 and N2O), combined with the robustness and reliability of the technology, makes Fourier Transform Infrared (FTIR) spectroscopy ideal for the continuous measurement of these emissions.

These measurements can be used to control and develop processes and emissions abatement systems. An example of a process that can be developed is the process of NOx reduction, or DeNOx. Through more efficient processes and optimally operating emissions abatement systems harmful emissions and greenhouse gases can be reduced.

Our Solutions: Continuous Monitoring System and Portable Gas Analyzer

Gasmet manufactures portable FTIR gas analyzers and stationary FTIR emissions monitoring systems. An FTIR analyzer works by simultaneously scanning an entire infrared spectrum. Our Calcmet software then calculates the concentrations of each gas in the sample based on the characteristic absorption. All the gases in the sample can be measured simultaneously because the entire infrared spectrum is scanned at once. This allows for very quick multicomponent measurements and for compensation for any cross-interference.

The Continuous Emissions Monitoring System CEMS II e offers TÜV and MCERTS certified solution (QAL1) for a wide range of demanding emission monitoring applications. The CEMS II e system utilizes Fourier Transform Infrared Spectroscopy FTIR technology.

The Gasmet DX4000 can be used when you need a portable gas analyzer solution instead of continuous gas monitoring. It is portable FTIR gas analyzer for applications where multiple gas compounds need to be accurately monitored in hot & humid sample gas. Gasmet DX4000 is the world’s smallest FTIR emissions monitoring system.

Why choose Gasmet as your FTIR partner?

Gasmet is an ideal partner for the chemical industry. Here are the top 5 reasons why you should choose us as your FTIR partner:

  • Multicomponent capability – measure multiple gases simultaneously
  • Adding new gases is easy – no need for hardware changes
  • FTIR emission monitoring systems are available with performance approvals (TÜV, MCERTS)
  • A portable FTIR analyzer allows you to take the lab to the site
  • Simple and low-cost calibration – Gasmet’s FTIR analyzers do not need any span or re-calibrations, only zero calibration with nitrogen needed

What you need to know about emissions monitoring

In this guide we will introduce you to Emissions Monitoring and FTIR (Fourier Transform Infrared) in emissions monitoring. We will also explain what needs to be taken into consideration in an effective set-up for emissions monitoring and present real-life example data measured with Gasmet CEMS II e and CMM. Increase your Emissions Monitoring knowledge by downloading the guide free of charge!


Case: Thetford Power Station

“The system has performed very well, with very little maintenance required. Zero point calibration with nitrogen (background) just takes a few minutes each day and is fully automated. Water vapour calibration is conducted at least once per year, but under normal circumstances no other calibration is necessary.” says Operations Team Leader Richard Bloomfield

Read full case study ❯

See also

Waste Incineration
Power Plants
Cement Production
Raw Gas Measurements
Compliance Measurements
Aluminum Production