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Journal of Spectroscopy
Volume 2018, Article ID 6893454, 5 pages
https://doi.org/10.1155/2018/6893454
Research Article

Application of Combustion Module Coupled with Cavity Ring-Down Spectroscopy for Simultaneous Measurement of SOC and δ13C-SOC

1Department of Agricultural and Forestry Science and Technology, Chongqing Three Gorges Vocational College, Chongqing 404000, China
2School of Hydrology and Water Resources, Nanjing University of Information Science and Technology, Nanjing 210044, China
3Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir, Chongqing Three Gorges University, Chongqing 404100, China

Correspondence should be addressed to Junjie Lin; moc.621@nil_uby

Received 6 October 2017; Accepted 12 December 2017; Published 1 February 2018

Academic Editor: Jau-Wern Chiou

Copyright © 2018 Dan Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Quantifying the decomposition of soil organic carbon (SOC) fractions under climate change is essential to predict carbon-climate feedbacks. The accuracy and utility of a combustion module coupled with cavity ring-down spectroscopy (CM-CRDS) system were assessed for simultaneously determining SOC and δ13C-SOC. Using a range of standard materials as well as soil samples, we compared the results of the CM-CRDS system with those from other systems for determining C content and δ13C value. The CM-CRDS system can determine a vast range of δ13C values from −7.639‰ to −34.318‰. The δ13C values measured at C content > 0.2 mg C, corresponding to 1000 ppmv of CO2, were relatively stable. However, below a content of 0.2 mg C, the δ13C values appeared unsteady and seemed to be affected by background signal. We found that, with the increase of C content, the recovery rates (RRs) for soil samples also increased. On the contrary, the RRs for inorganic materials were much lower than organic material and soil samples. Overall, the CM-CRDS system provides a valid alternative method to determine SOC and δ13C-SOC for a sample simultaneously.