Conversion of carbon eq. measured by FID in real VOC eq.

Calculation definition   Launch calculation

Atmospheric emissions from canalised outputs are determined by measurements (usually done every year).

VOC concentration is often measured using FID method (Flame Ionisation Detector) which gives results in carbon equivalent (concentration in mgC/Nm3 for example).

The graph shown below illustrates FID measurements on a canalised output.


FID conversion tool can be used to convert FID concentration measurements to real solvent concentrations. Thus a real emissions balance can be produced for an industrial site.

This tool (working with mono or multi solvents) uses carbon atoms response factor of chemical compounds contained in output emissions to atmosphere. These response factors can be obtained as follows:

  • From the company that does the measurements,
  • From the FID analyser manufacturer,
  • From theoretical calculations based on chemical's formula (case of some response factors defined in Envmodels products database).

Calculation Example:

Average concentration measured on a canalised output is 230 mgC/Nm3. Solvent composition is:

  • Xylène : 50%,
  • Toluène : 50%.

Real VOC concentration for this measurement is 263.5 mgCOV/Nm3.

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