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首页> 外文期刊>Biogeochemistry >Organic matter decomposition: bridging the gap between Rock-Eval pyrolysis and chemical characterization (CPMAS C-13 NMR)
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Organic matter decomposition: bridging the gap between Rock-Eval pyrolysis and chemical characterization (CPMAS C-13 NMR)

机译：有机物分解：弥合Rock-Eval热解和化学表征（CPMAS C-13 NMR）之间的差距

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Organic matter (OM) is a key component of soils but information on its chemistry and behavior in soils is still incomplete. Numerous methods are commonly used to characterize and monitor OM dynamics, but only a few include the qualities required to become routine techniques i.e. simple, rapid, accurate and at low cost. Rock-Eval pyrolysis (RE pyrolysis) is a good candidate, as it provides an overview of OM properties by monitoring four components related to the main major classes of organic constituents (from A1 for the labile biological constituents to A4 for the mature refractory fraction). However, a question is still pending: do these four major classes used in the literature reflect a pertinent compositional chemical counterpart? C-13 Nuclear Magnetic Resonance Spectroscopy in the solid state (C-13 CPMAS NMR) has been used to answer this question by collecting information on structural and conformational characteristics of OM. Moreover, in order to avoid the blurring effect of pedogenesis on OM dynamics, a "less complex OM" source, i.e. compost samples, has been used. Results showed significant and high determination coefficients between classes, indices (of transformation of plant biopolymers, humificationaEuro broken vertical bar) from RE pyrolysis, and the main classes of OM characterized by C-13 NMR, e.g. A1 & A2 with labile/easily degradable components (alkyl C et O-alkyl C), A3 & A4 with humified OM (with aromatic C and phenolic C). The R index (contribution of bio-macromolecules) is correlated with phenolic and aromatic C, whereas the I index (related to immature OM) refers to labile--easily degradable components (alkyl C et O-alkyl C). The results confirm the pertinence of RE pyrolysis to monitor OM dynamics.
机译：有机物（OM）是土壤的关键组成部分，但有关其化学性质和在土壤中的行为的信息仍然不完整。通常使用多种方法来表征和监视OM动态，但是只有少数几种方法包括成为常规技术所需的质量，即简单，快速，准确且成本低廉。 Rock-Eval热解（RE热解）是一个很好的选择，因为它通过监视与主要有机成分的主要主要类别有关的四个成分（从对不稳定生物成分而言为A1到对于成熟耐火成分为A4）提供了OM特性的概述。 。但是，仍然存在一个问题：文献中使用的这四个主要类别是否反映了相关的组成化学对应物？固态C-13核磁共振波谱（C-13 CPMAS NMR）已用于通过收集有关OM的结构和构象特征的信息来回答此问题。此外，为了避免成岩作用对OM动力学的模糊影响，已经使用了“不太复杂的OM”源，即堆肥样品。结果表明，RE热解的类别，指标（植物生物聚合物的转化，腐殖化，欧洲破碎的竖条）和以C-13 NMR为特征的OM的主要类别之间具有显着而高的测定系数。 A1和A2具有不稳定/易于降解的成分（烷基C和O-烷基C），A3和A4具有腐殖化的OM（具有芳族C和酚C）。 R指数（生物大分子的贡献）与酚和芳香族C相关，而I指数（与未成熟的OM相关）指不稳定且易于降解的组分（烷基C和O-烷基C）。结果证实了RE热解监测OM动态的相关性。

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