Literature review on the performance of diffusive samplers for the measurement of ammonia in ambient air and emissions to air
Résumé
The information in this document has formed the basis from which a new standard on
measurements employing ammonia diffusive samplers by CEN TC264 WG11 'Ambient air
- Diffusive samplers' is being developed and provides an open reference document for the
ammonia passive sampling techniques.
This document briefly summarises the importance of ammonia as a key atmospheric
pollutant, together with information on relevant EU and other international legislation and
protocols that are in place to regulate its concentration.
An extensive review of the technology that is currently employed to monitor this molecule
is presented. Denuders, which are considered the unofficial international reference
method are described and other technologies outlined.
The report summarises information on ammonia diffusive samplers from different
manufacturers that are currently available in the market and presented an extensive
literature summary of quality assurance and calibration which has been carried out both
by manufacturers and sampler users.
Results are provided from a recent European study (“Metrology for ammonia in ambient
air (MetNH3)”), which targeted improvements in traceability and accuracy of ambient
ammonia diffusive samplers. New traceable measurements of the ammonia diffusive
sampling rates for passive samplers in common use are presented, and an evaluation of
the expanded measurement uncertainty for the calculations of ambient ammonia
concentrations.
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