Application of Combustion Module Coupled with Cavity Ring-Down Spectroscopy for Simultaneous Measurement of SOC and delta C-13-SOC

作者：Liu, Dan; Yu, Zhiguo; Lin, Junjie^*

来源：Journal of Spectroscopy, 2018, 2018: 6893454.

DOI：10.1155/2018/6893454

• ORGANIC-MATTER
• SOIL CARBON
• RATIO
• DECOMPOSITION
• SPECTROMETRY
• C-13/C-12

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 delta C-13-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 delta C-13 value. The CM-CRDS system can determine a vast range of delta C-13 values from -7.639% to -34.318%. The delta C-13 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 delta C-13 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 delta C-13-SOC for a sample simultaneously.

• 出版日期2018
• 单位南京信息工程大学; 重庆三峡学院