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Isotopes in Environmental and Health Studies Volume 42, 2006 - Issue 1
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Original Articles

Measuring the 13C/12C isotope ratio in atmospheric CO2 by means of laser absorption spectrometry: a new perspective based on a 2.05-μm diode laser

Antonio Castrillo Dipartimento di Scienze Ambientali, Seconda Università di Napoli, Caserta, Italy; CNISM—Unità di Napoli 2, Via Vivaldi 43, 81100, Caserta, Italy
,
Giovanni Casa Dipartimento di Scienze Ambientali, Seconda Università di Napoli, Caserta, Italy; CNISM—Unità di Napoli 2, Via Vivaldi 43, 81100, Caserta, Italy
,
Antonio Palmieri Dipartimento di Scienze Ambientali, Seconda Università di Napoli, Caserta, Italy; CNISM—Unità di Napoli 2, Via Vivaldi 43, 81100, Caserta, Italy
&
Livio Gianfrani Dipartimento di Scienze Ambientali, Seconda Università di Napoli, Caserta, Italy; CNISM—Unità di Napoli 2, Via Vivaldi 43, 81100, Caserta, ItalyCorrespondence[email protected]
Pages 47-56 | Received 25 Oct 2005, Published online: 04 Mar 2011
 
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Abstract

The potential use of high sensitivity laser absorption spectroscopy for measuring the 13C/12C isotope ratio in atmospheric CO2 has been demonstrated, using a GaSb-based diode laser at 2.05 μm. In this spectral region, the overlapping between relatively strong 12CO2 and 13CO2 absorption features gives rise to several line pairs which are well suitable for a spectroscopic determination of the isotope ratio. Preliminary results have demonstrated that a short-term precision better than 1‰ can be easily obtained, for a CO2 concentration of 1000 ppm. We extensively discuss the influence of a possible non-linearity in the detectors' response on the δ-value and suggest an instrumental development that would allow to eliminate this effect.

Acknowledgements

This work was partially funded by MIUR in the framework of PON 2000-2006, project SVISENARIA.

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