Guo Fei, Wu Fengchang, Mu Yunsong, Hu Yan, Zhao Xiaoli, Meng Wei, Giesy John P, Lin Ying
Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, China.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Sci Rep. 2016 Mar 8;6:22877. doi: 10.1038/srep22877.
Organic matter (OM) has been characterized using thermal analysis in O2 atmospheres, but it is not clear if OM can be characterized using slow thermal degradation in N2 atmospheres (STDN). This article presents a new method to estimate the behavior of OM in anaerobic environment. Seventeen different plants from Tai Lake (Ch: Taihu), China were heated to 600 °C at a rate of 10 °C min(-1) in a N2 atmosphere and characterized by use of differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). DSC chromatograms were compared with 9 standard compounds. Seven peaks were observed in DSC chromatograms, 2 main peaks strongly correlated with biochemical indices, and one main peak was a transitional stage. Energy absorbed by a peak at approximately 200 °C and total organic carbon were well correlated, while energy absorbed at approximately 460 °C was negatively correlated with lignin content. Presence of peaks at approximately 350 and 420 °C varied among plant biomass sources, providing potential evidence for biomass identification. Methods of STDN reported here were rapid and accurate ways to quantitatively characterize OM, which may provide useful information for understanding anaerobic behaviors of natural organic matters.
有机物（OM）已在氧气氛围中通过热分析进行了表征，但尚不清楚能否在氮气氛围中的缓慢热降解（STDN）条件下对OM进行表征。本文提出了一种估算OM在厌氧环境中行为的新方法。在中国太湖采集的17种不同植物在氮气氛围中以10 °C min(-1)的升温速率加热至600 °C，并通过差示扫描量热法（DSC）和热重分析（TGA）进行表征。将DSC色谱图与9种标准化合物进行了比较。在DSC色谱图中观察到7个峰，其中2个主峰与生化指标密切相关，1个主峰为过渡阶段。在约200 °C处的峰吸收的能量与总有机碳密切相关，而在约460 °C处吸收的能量与木质素含量呈负相关。在约350和420 °C处峰的出现情况因植物生物质来源而异，为生物质识别提供了潜在证据。本文报道的STDN方法是定量表征OM的快速且准确的方法，可为理解天然有机物的厌氧行为提供有用信息。
