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Article Abstract
Novel traceable analytical methods and reference gas standards were developed for the detection of trace-level ammonia in biogas and biomethane. This work focused on an ammonia amount fraction at an upper limit level of 10 mg m (corresponding to approximately 14 μmol mol) specified in EN 16723-1:2016. The application of spectroscopic analytical methods, such as Fourier transform infrared spectroscopy, cavity ring-down spectroscopy, and optical feedback cavity-enhanced absorption spectroscopy, was investigated. These techniques all exhibited the necessary ammonia sensitivity at the required 14 μmol mol amount fraction. A 29-month stability study of reference gas mixtures of 10 μmol mol ammonia in methane and synthetic biogas is also reported.
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| http://dx.doi.org/10.1021/acs.analchem.2c01951 | DOI Listing |
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