EMPIR Heroes Project Deliverable D4, Summary report on the scientific evidence base used to derive recommended uncertainty requirements to extend the application of EN1911 to low HCl emitting processes regulated via BAT conclusions

The objective of the HEROES study was to assess whether the standardized reference method, used for periodic HCl monitoring at industrial installations, as well as for calibrating continuous monitoring systems for this compound (reference method described in standard EN 1911), remains fit for purpose as emission limit values - and therefore emitted concentrations - continue to decrease.
The reference method is described in standard EN 1911.
EN 1911 is a manual method that involves a on-site sampling phase on site, followed by laboratory analysisof the samples (absorption solutions). During the EMPIR HEROES project different actions were proposed by the partners, in order to identify the factors likely to affect the measurement results and their associated uncertainty. This study also examined wether the method could respect the uncertainty criterion set out in the standard, when applied at low concentration levels.
The tests led to the identification of different limitations of the method, and to the formulation of recommendations or requirements for the revision of the standard with a view to improving the performance of the method and to adapting it for future ELVs.
The report presents the work done carried out and highlights the main conclusions. These resulting  data have been compiled in order to make them available to the community through a data sharing platform.