Dr. Gerald Hörner Profile

Dr. Gerald Hörner

at Univ Potsdam

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Proceedings Article | 9 November 2004 Paper

NIR-diode laser spectroscopy for isotope-selective sensing of soil-respired carbon dioxide

Gerald Hoerner, Steffen Lau, Hans-Gerd Loehmannsroeben

Proceedings Volume 5544, (2004) https://doi.org/10.1117/12.559551

KEYWORDS: Carbon monoxide, Spectroscopy, Soil science, Absorption, Modulation, Laser spectroscopy, Gases, Calibration, Sensors, Optical fiber cables

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The performance of a home-built tunable diode laser (TDL) spectrometer has been optimized regarding multi-line detection of carbon dioxide in natural gases. In the regime of the (30⁰1)_III;←(000) band of ¹²CO₂ around 1.6 μm, the dominating isotope species ¹²CO₂, ¹³CO₂, and¹²C¹⁸O¹⁶O were detected simultaneously. In contrast to most established techniques, selective measurements are performed without any sample preparation. This is possible since the CO₂ detection is free of interference from water, ubiquitous in natural gases. Detection limits in the range of a few ppmv were obtained for each species utilizing wavelength modulation (WM) spectroscopy with balanced detection in a long-path absorption cell set-up. Linear calibration plots cover a dynamic range of four orders of magnitude, allowing for quantitative CO₂ detection in various samples, like soil and breath gas. High isotopic resolution enables the excellent selectivity, sensitivity, and stability of the chosen analytical concept. The obtained isotopic resolution of typically ± 1.0 % and ± 1.5 % (for 3 vol. % and 0.7 vol. % of CO₂, respectively) offers a promising analytical tool for isotope-ratio determination of carbon dioxide in soil gas. Preliminary experiments on soil respiration for the first time combine the on-line quantification of the overall carbon dioxide content with an optode sensor and isotopic determination (TDL system) of natural gas species.

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