Articles | Volume 12, issue 5
Research article
20 May 2019
Research article |  | 20 May 2019

High-precision measurements of nitrous oxide and methane in air with cavity ring-down spectroscopy at 7.6 µm

Jing Tang, Bincheng Li, and Jing Wang

Related subject area

Subject: Gases | Technique: Laboratory Measurement | Topic: Data Processing and Information Retrieval
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Cited articles

Banik, G. D., Som, S., Maity, A., Pal, M., Maithani, S., Mandal, S., and Pradhan, M.: An EC-QCL based N2O sensor at 5.2 µm using cavity ring-down spectroscopy for environmental applications, Anal. Methods-UK, 9, 2315–2320,, 2017. 
Bleakley, B. H. and Tiedje, J. M.: Nitrous-oxide production by organisms other than nitrifiers or denitrifiers, Appl. Environ. Microbiol., 44, 1342–1348, 1982. 
Botez, D., Kirch, J. D., Boyle, C., Oresick, K. M., Sigler, C., Kim, H., Knipfer, B. B., Ryu, J. H., Lindberg, D., Earles, T., Mawst, L. J., and Flores, Y. V: High-efficiency, high-power mid-infrared quantum cascade lasers, Opt. Mater. Express, 8, 1378–1398,, 2018. 
Boucher, O., Friedlingstein, P., Collins, B., and Shine, K. P.: The indirect global warming potential and global temperature change potential due to methane oxidation, Environ. Res. Lett., 4, 044007,, 2009. 
Brubaker, P. H.: Use of exhaled nitric oxide measurements to guide treatment in chronic asthma, J. Cardiopulm. Rehabil. Prev., 36, 140–141,, 2016. 
Short summary
A high-sensitivity CH4 and N2O sensor based on mid-IR (7.6 µm) cavity ring-down spectroscopy was developed. The effect of temperature fluctuation on measurement sensitivity was analyzed and corrected, and detection limits of 5 pptv for CH4 and 9 pptv for N2O were experimentally achieved. Separate and continuous measurements of CH4 and N2O concentrations of indoor and outdoor air at different locations showed the spatial and temporal concentration variations of CH4 and N2O in air.