A continuous-flow denuder for the measurement of ambient concentrations and surface-exchange fluxes of ammonia |
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| Institution: | 1. Key Lab of Aerosol Chemistry & Physics, SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an 710061, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Department of Atmospheric Science, National Taiwan University, Taipei 10617, Taiwan;4. National Center for Atmospheric Research, Boulder, CO 80303, USA;5. Institute of Global Environmental Change, Xi''an Jiaotong University, Xi''an 710049, China;6. Laboratory of Atmospheric Chemistry, Paul Scherrer Institute (PSI), 5232 Villigen, Switzerland;7. College of Urban and Environmental Sciences, Northwest University, Xian 710127, China |
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| Abstract: | A new diffusion denuder is described for the continuous measurement of atmospheric ammonia. Ammonia is collected in an absorption solution in a rotating denuder, separated from interfering compounds by diffusion through a semi-permeable membrane and detected by conductometry. The method is free from interferences by other atmospheric gases, with the exception of volatile amines. The detection limit is 6 ng m−3 for a 30-min integration time. This compact instrument is fully automated and suited for routine deployment in field studies. The precision is sufficiently high for micrometeorological studies of air-surface exchange of ammonia. |
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