Culleton, L P; Amico di Meane, E; Ward, M K M; Ferracci, V; Persijn, S; Holmqvist, A; Arrhenius, K; Murugan, A; Brewer, P J (2022) Characterization of Fourier Transform Infrared, Cavity Ring-down Spectroscopy and Optical Feedback Cavity-enhanced Absorption SPectroscopy Instruments for the Analysis of Ammonia in Biogas and Biomethane. Analytical Chemistry, 94 (44). pp. 15207-15214.

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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 the upper limit level of 10 mg m−3 (corresponding to approximately 14 μmol mol-1) specified in EN 16723-1:2016. The application of spectroscopic analytical methods such as Fourier-transform infrared (FTIR) spectroscopy, cavity ring-down spectroscopy (CRDS) and optical feedback cavity enhanced absorption spectroscopy (OFCEAS), was investigated. These techniques all exhibited the necessary ammonia sensitivity at the required 14 μmol mol-1 amount fraction. A 29-month stability study of reference gas mixtures of 10 µmol mol-1 ammonia in methane and synthetic biogas, is also reported.

Item Type:	Article
Keywords:	Biogas ammonia spectroscopy FTIR CRDS OFCEAS biomethane
Subjects:	Analytical Science > Gas Standards
Divisions:	Atmospheric Environmental Sciences
Identification number/DOI:	10.1021/acs.analchem.2c01951
Last Modified:	05 May 2023 13:58
URI:	https://eprintspublications.npl.co.uk/id/eprint/9704