ISO DIS 20264

Description / Abstract: This international standard specifies the use of FTIR spectrometry for determining the concentrations of individual volatile organic compound (VOC) in waste gases from non-combustion processes. The method can be employed to continuously analyse sample gas which is extracted from ducts and other sources. A bag sampling method may also be applied, if the compounds do not adsorb on the bag material. This would only be used in cases where it is difficult or impossible to obtain a direct extractive sample.

The principle, sampling procedure, IR spectral measurement and analysis, calibration, handling interference, QA/QC procedures and some essential performance criteria for measurement of individual VOCs are described in this standard.

Note 1 The practical minimum detectable concentration of this method depends on the FTIR instrument (i.e. gas cell path length, resolution, instrumental noise and analytical algorithm used), compounds, and interference specific (e.g. water and CO₂).