The Importance of Sorption to Minerals on Microbial Reactivity and Organic Matter Preservation

KEIL(OCE-9711792)摘要KEIL OCE-9711792地球化学家早就认识到矿物表面在保护和保存水生沉积物中的海洋有机质(OM)方面的潜在重要性。这项建议旨在通过更详细地评估有机矿物与矿物表面积之比(OM：SA)来加深对有机质保存的理解，该比率最近被PI和其他人证明对评估海洋沉积物中的有机质保存是有用的。拟议的测量旨在回答海洋地球化学中有关形成和塑造OM：SA关系的因素和过程的基本问题。将使用广泛的方法来评价海洋沉积物，包括：结合探测技术(X射线光电子能谱、紫外光氧化、密度分馏)；吸附提取的有机物质以了解矿物相；以及进行微生物降解实验。PI将对从对比氧化还原环境和OM：SA设置中收集的样本进行这些实验。拟议的研究建立在国际海洋研究所以前进行的成功实验的基础上，应该会大大提高我们对海洋沉积物中有机质保存的理解。

Keil (OCE-9711792) ABSTRACT Keil OCE-9711792 Geochemists have long recognized the potential importance of mineral surfaces in protecting and preserving marine organic matter (OM) in aquatic sediments. This proposal seeks to further out understanding of OM preservation by evaluating in more detail the organic mineral to mineral surface area ratio (OM:SA) which has recently been shown by this PI and others to be useful for evaluating OM preservation in marine sediments. The proposed measurements are aimed at answering fundamental questions in marine geochemistry about the factors and processes that form and mold the OM:SA relationship. A wide range of approaches will be used to evaluate marine sediments, including: a combination of probing techniques (X-ray photoelectron spectroscopy (XPS), UV photooxidation, density fractionation); adsorbing extracted organic matter to know mineral phases; and, conducting microbial degradation experiments. The PI will conduct these experiments on samples collected from contrasting redox environments and OM:SA settings. The proposed studies build on successful experiments previously conducted by the PI and should lead to a significant advancement in our understanding of OM preservation in ocean sediments.