Diffusion Scrubber Tech¬nique used for Measurements of Atmospheric Ammonia

Lise Lotte Sørensen, Kit Granby, Hans Nielsen, Willem A. H. Asman

Research output: Contribution to journalJournal articleResearchpeer-review


A diffusion scrubber (DS) was developed to measure trace levels of gaseous ammonia in ambient air. The sampling resolution time for this method is 10 min and the detection limit is estimated to be 0.01 ppbv. The response to the NH3 concentrations is found to be dependent on the relative humidity in the ambient air and the temperature. The method is calibrated by using a diluted NH3 cylinder gas, and the concentrations of the calibration gas were in the range 0.02-2 ppbv during the test. Sampling performed with the DS-method is compared to sampling performed by a filter pack and a continuous flow denuder (AMANDA). The DS-method shows good agreement with the continuous flow denuder and the filter pack.
Original languageEnglish
JournalAtmospheric Environment
Issue number22
Pages (from-to)3637-3645
Publication statusPublished - 1994
Externally publishedYes


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