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URN: urn:nbn:de:kobv:517-opus-10148
URL: http://opus.kobv.de/ubp/volltexte/2006/1014/


Hörner, Gerald ; Lau, Steffen ; Löhmannsröben, Hans-Gerd

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

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Kurzfassung auf Englisch

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, and 12C18O16O 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.

SWD-Schlagwörter: Kohlendioxid , Isotopenverhältnis
Freie Schlagwörter (deutsch): Bodengas , Diodenlaserspektroskopie
Freie Schlagwörter (englisch): tunable diode laser (TDL) , carbon dioxide , isotope ratios , soil gas
RVK - Regensburger Verbundklassifikation VE 9908
Collection Universität Potsdam / Aufsätze (Pre- und Postprints) / Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie / Physikalische Chemie
Institut: Institut für Chemie
DDC-Sachgruppe: Chemie
Dokumentart: c Postprint
Schriftenreihe: Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe, ISSN 1866-8372
Band Nummer: paper 021
Quelle: Proc. SPIE Vol. 5544 (2004), pp. 47 - 54
Sprache: Englisch
Erstellungsjahr: 2004
Publikationsdatum: 01.11.2006
Bemerkung:
© 2004 Society of Photo-Optical Instrumentation Engineers

This paper was published in:
Remote Sensing and Modeling of Ecosystems for Sustainability / Wei Gao, David R. Shaw (eds.), Proceedings of SPIE, Vol. 5544 (2004), pp. 47-54
ISBN: 0-8194-5482-6
DOI:10.1117/12.559551

It is made available as an electronic reprint with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purpose, or modification of the content of the paper are prohibited.


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