Advances in Scanning Transmission X-Ray Microscopy for Elucidating Soil Biogeochemical Processes at the Submicron Scale

文献类型： 外文期刊

第一作者： Stuckey, Jason W.

作者： Stuckey, Jason W.;Sparks, Donald L.;Stuckey, Jason W.;Sparks, Donald L.;Yang, Jianjun;Wang, Jian

作者机构：

期刊名称：JOURNAL OF ENVIRONMENTAL QUALITY （ 影响因子：2.751； 五年影响因子：3.309 ）

ISSN： 0047-2425

年卷期： 2017 年 46 卷 6 期

页码：

收录情况： SCI

摘要： Organic matter, minerals, and microorganisms are spatially associated in complex organo-mineral assemblages within soils. A mechanistic understanding of processes occurring within organo-mineral assemblages requires noninvasive techniques that minimize any disturbance to the physical and chemical integrity of the sample. Synchrotron-based soft (50-2200 eV) X-ray spectromicroscopic techniques, including scanning transmission X-ray microscopy (STXM), transmission X-ray microscopy (TXM), X-ray photoemission electron microscopy (X-PEEM), and scanning photoelectron microscopy (SPEM), coupled with microspectroscopy (e.g., near-edge X-ray absorption fine structure; NEXAFS) allow for determining the spatial association and speciation of most elements found in soils while maintaining sample integrity. This review highlights application of the four spectromicroscopic techniques mentioned above to soil biogeochemical research, with particular emphasis on STXM-NEXAFS, which has contributed to the greatest set of advancements in the understanding of soil organo-mineral interactions, including mineral control on organic carbon cycling and the mechanisms of biomineral formation.

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