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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2018-377
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2018-377
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 29 Nov 2018

Research article | 29 Nov 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Negligible influence of livestock contaminants and sampling system on ammonia measurements with cavity ring-down spectroscopy

Jesper Nørlem Kamp1,2, Albarune Chowdhury1, Anders Peter S. Adamsen3, and Anders Feilberg1 Jesper Nørlem Kamp et al.
  • 1Department of Engineering, Aarhus University, Aarhus, 8000, Denmark
  • 2Arctic Research Centre, Aarhus University, 8000 Aarhus, Denmark
  • 3SEGES, 8200 Aarhus N, Denmark

Abstract. Pollution from ammonia (NH3) is a widespread problem due to the effects on the environment and human health. The agricultural sector accounts for nearly all NH3 emissions in Europe; thus, focus has especially been on NH3 emissions from this sector in recent years. We need abatement techniques to reduce NH3 emissions, and in order to evaluate the techniques, there is a strong need for reliable NH3 measurement methods. Photoacoustic spectroscopy (PAS) is often used to measure NH3 concentrations, but recent discoveries show interference from compounds typically present in livestock production and during agricultural activities. We tested the performance of the Cavity Ring-Down Spectroscopy (CRDS) from Picarro for filter effects and laboratory and field calibrations with standard gasses. Furthermore, concentrations of ten volatile organic compounds (VOCs) where determined by Proton-Transfer-Reaction Mass Spectrometry (PTR-MS) to test the potential interference of these VOCs. Both laboratory and field calibrations show excellent linearity over a large dynamic range of NH3 concentrations. The analyzer shows a small humidity effect of up to a few ppb in the extreme case of a nearly water saturated air stream. Besides, from the negligible humidity dependence, there is no interference from the tested VOCs. Overall, the system performs well with only negligible influences from other compounds.

Jesper Nørlem Kamp et al.
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Jesper Nørlem Kamp et al.
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Short summary
We tested the performance of the a Cavity Ring-Down Spectroscopy from Picarro to measure ammonia. Interference tests with ten volatile organic compounds (VOCs) were conducted to find potential interference of these VOCs. Calibrations show excellent linearity over a large dynamic range of NH3 concentrations. Besides, from a negligible humidity dependence, there is no interference from the tested VOCs. Overall, the CRDS system performs well with only negligible influences from other compounds.
We tested the performance of the a Cavity Ring-Down Spectroscopy from Picarro to measure ...
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