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首页> 外文期刊>Environmental Science & Technology >Validating the Scalability of Soft X-ray Spectromicroscopy for Quantitative Soil Ecology and Biogeochemistry Research
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Validating the Scalability of Soft X-ray Spectromicroscopy for Quantitative Soil Ecology and Biogeochemistry Research

机译：验证软X射线光谱显微镜的可扩展性，以用于定量土壤生态学和生物地球化学研究

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摘要

Synchrotron-based soft-X-ray scanning transmission X-ray microscopy (STXM) has the potential to provide nanoscale resolution of the associations among biological and geological materials. However, standard methods for how samples should be prepared, measured, and analyzed to allow the results from these nanoscale imaging and spectroscopic tools to be scaled to field scale biogeochemical results are not well established. We utilized a simple sample preparation technique that allows one to assess detailed mineral, metal, and microbe spectroscopic information at the nano- and microscale in soil colloids. We then evaluated three common approaches to collect and process nano- and micronscale information by STXM and the correspondence of these approaches to millimeter scale soil measurements. Finally, we assessed the reproducibility and spatial autocorrelation of nano- and micronscale protein, Fe(Ⅱ) and Fe(Ⅲ) densities in a soil sample. We demonstrate that linear combination fitting of entire spectra provides slightly different Fe(Ⅱ) mineral densities compared to image resonance difference mapping but that difference mapping results are highly reproducible between among sample replicates. Further, STXM results scale to the mm scale in complex systems with an approximate geospatial range of 3 μm in these samples.
机译：基于同步加速器的软X射线扫描透射X射线显微镜（STXM）具有提供纳米级分辨率的生物和地质材料之间关联的潜力。但是，如何很好地准备，测量和分析样品的标准方法尚未得到很好的建立，这些标准方法无法将这些纳米级成像和光谱工具的结果按比例缩放到现场规模。我们利用一种简单的样品制备技术，可以评估土壤胶体中纳米和微米级的详细矿物，金属和微生物光谱信息。然后，我们评估了通过STXM收集和处理纳米和微米级信息的三种常见方法，以及这些方法与毫米级土壤测量的对应性。最后，我们评估了土壤样品中纳米和微米级蛋白质Fe（Ⅱ）和Fe（Ⅲ）密度的重现性和空间自相关性。我们证明，与图像共振差异图相比，整个光谱的线性组合拟合提供的Fe（Ⅱ）矿物质密度略有不同，但是差异图的结果在样品重复之间是高度可再现的。此外，在这些样本中，STXM结果在复杂系统中的比例缩放为mm比例，其地理空间范围约为3μm。

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  • 来源
    《Environmental Science & Technology》 |2015年第2期|1035-1042|共8页
  • 作者

    James J. Dynes; Tom Z. Regier; Ian Snape; Steven D. Siciliano; Derek Peak;

  • 作者单位

    Canadian Light Source, 44 Innovation Boulevard, Saskatoon, Saskatchewan, Canada S7N 2 V3;

    Canadian Light Source, 44 Innovation Boulevard, Saskatoon, Saskatchewan, Canada S7N 2 V3;

    Australian Antarctic Division, Department of Sustainability, Environment, Water, Population and Communities, 203 Channel Highway, Kingston, Tasmania, Australia 7050;

    Department of Soil Science, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5A8;

    Department of Soil Science, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5A8;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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