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

被引:4
作者
Hörner, G [1 ]
Lau, S [1 ]
Lömannsröben, HG [1 ]
机构
[1] Univ Potsdam, Inst Chem, D-14476 Potsdam, Germany
来源
REMOTE SENSING AND MODELING OF ECOSYSTEMS FOR SUSTAINABILITY | 2004年 / 5544卷
关键词
tunable diode laser (TDL); carbon dioxide; isotope ratios; soil gas;
D O I
10.1117/12.559551
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
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 (30(0)1)(III) <-- (000) band of (CO2)-C-12 around 1.6 mum, the dominating isotope species (CO2)-C-12, (CO2)-C-13, and (COO)-C-12-O-18-O-16 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 parts per thousand and 1.5 parts per thousand (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.
引用
收藏
页码:47 / 54
页数:8
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