Abstract Despite the abundance of diagenetically derived organic materials in the environment, the effects of diagenesis on the structure and some of the associated properties (e.g., stability and sorption behavior) of organic matter (OM) remain unclear. Here, subcritical water treatment, suggested previously to mimic the diagenesis process, was chosen to further investigate the impact of diagenesis on OM compositions, stability and sorption of selected hydrophobic organic compounds. Humic acids and biochars were selected as representatives of natural and engineered OM, respectively. To examine the impact of mineral constituents on the diagenesis of OM, de-ashed samples, as well as samples amended with minerals (kaolinite, calcite and calcium dihydrogen phosphate), were included in the diagenesis treatment system. Comparison of OM composition before and after treatment indicated that simulated diagenesis resulted in lower bulk polarity, higher surface polarity and aromaticity and greater microporosity. Thermal analysis and chemical oxidation suggested that as a result of the increase in aromaticity and decrease in O/C ratio of OM, the resistance of OM to thermal and chemical oxidation was enhanced after simulated diagenesis. Moreover, our diagenesis treatment of OM induced stronger sorption nonlinearity and higher sorption capacity, for phenanthrene. Additionally, minerals protected the structure of OM from being changed by simulated diagenesis. Consequently, with regard to the susceptibility of OM to oxidative decay, the presence of minerals mitigated the increase in chemical stability imparted by simulated diagenesis but, on the other hand, protected OM from degradation.

中文翻译：

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模拟成岩作用对不同矿物含量天然和工程有机质组成、化学稳定性和吸附特性的影响

摘要 尽管环境中存在大量成岩衍生的有机物质，但成岩作用对有机物质 (OM) 的结构和一些相关特性（例如稳定性和吸附行为）的影响仍不清楚。在这里，之前建议模拟成岩过程的亚临界水处理被选择来进一步研究成岩作用对 OM 组成、稳定性和所选疏水性有机化合物的吸附的影响。腐植酸和生物炭分别被选为天然和工程 OM 的代表。为了检查矿物成分对 OM 成岩作用的影响，在成岩处理系统中包括脱灰样品以及用矿物质（高岭石、方解石和磷酸二氢钙）改性的样品。处理前后OM组成的比较表明，模拟成岩作用导致较低的本体极性、较高的表面极性和芳香性以及较大的微孔。热分析和化学氧化表明，由于OM的芳香性增加和O/C比降低，模拟成岩作用后OM对热和化学氧化的抵抗力增强。此外，我们对 OM 的成岩处理对菲诱导了更强的吸附非线性和更高的吸附能力。此外，矿物保护了 OM 的结构不被模拟成岩作用改变。因此，关于 OM 对氧化衰变的敏感性，矿物质的存在减轻了模拟成岩作用赋予的化学稳定性的增加，但另一方面，