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首页> 外文期刊>Journal of spectroscopy >Application of Combustion Module Coupled with Cavity Ring-Down Spectroscopy for Simultaneous Measurement of SOC and δ13C-SOC
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Application of Combustion Module Coupled with Cavity Ring-Down Spectroscopy for Simultaneous Measurement of SOC and δ13C-SOC

机译：燃烧模块结合腔衰荡光谱技术同时测量SOC和δ13C-SOC

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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.
机译：量化气候变化下土壤有机碳（SOC）组分的分解对于预测碳气候反馈至关重要。评估了与腔衰荡光谱（CM-CRDS）系统耦合的燃烧模块的准确性和实用性，以便同时确定SOC和δ13C-SOC。我们使用一系列标准材料以及土壤样品，将CM-CRDS系统的结果与其他系统的结果进行了比较，以确定C含量和δ13C值。 CM-CRDS系统可以确定范围从-7.639‰至-34.318‰的δ13C值。在C含量≥0.2mg C时测得的δ13C值相对稳定，相当于1000 ppmv的CO2。但是，低于0.2μmgC时，δ13C值似乎不稳定，似乎受背景信号影响。我们发现，随着C含量的增加，土壤样品的回收率（RRs）也增加。相反，无机材料的RR远低于有机材料和土壤样品的RR。总体而言，CM-CRDS系统提供了一种有效的替代方法来同时确定样品的SOC和δ13C-SOC。

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