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首页> 外文会议>XRM 2012 >New Developments in Hard X-ray Fluorescence Microscopy for In-situ Investigations of Trace Element Distributions in Aqueous Systems of Soil Colloids
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New Developments in Hard X-ray Fluorescence Microscopy for In-situ Investigations of Trace Element Distributions in Aqueous Systems of Soil Colloids

机译：硬X射线荧光显微镜的新发展，用于原位研究土壤胶体含水系统中的微量元素分布

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The distribution, binding and release of trace elements on soil colloids determine matter transport through the soil matrix, and necessitates an aqueous environment and short length and time scales for their study. However, not many microscopy techniques allow for that. We previously showed hard x-ray uorescence microscopy capabilities to image aqueous colloidal soil samples [1]. As this technique provides attogram sensitivity for transition elements like Cu, Zn, and other geochemically relevant trace elements at sub micrometer spatial resolution (currently down to 150nm at 2-ID-E [2]; below 50nm at Bionanoprobe, cf. G.Woloschak et al, this volume) combined with the capability to penetrate tens of micrometer of water, it is ideally suited for imaging the elemental content of soil colloids. To address the question of binding and release processes of trace elements on the surface of soil colloids, we developed a microuidics based XRF ow cytometer, and expanded the applied methods of hard x-ray uorescence microscopy towards three dimensional imaging. Here, we show (a) the 2-D imaged distributions of Si, K and Fe on soil colloids of Pseudogley samples; (b) how the trace element distribution is a dynamic, pH-dependent process; and (c) x-ray tomographic applications to render the trace elemental distributions in 3-D. We conclude that the approach presented here shows the remarkable potential to image and quantitate elemental distributions from samles within their natural aqueous microenvironment, particularly important in the environmental, medical, and biological sciences.
机译：土壤胶体上的微量元素的分布，结合和释放确定通过土壤基质的物质运输，需要进行含水环境和短的长度和时间尺度。但是，没有许多显微镜技术允许该技术。我们以前向成像水性胶体土壤样品显示硬X射线孔隙显微镜功能[1]。由于该技术为Cu，Zn等地球尺相似的微量元素（如2-ID-E的目前降至150nm的地球化学上相关的微量元素等地球化学相关的微量元件提供了镜像敏感性。在Bionanoprobe，CF.G.Woloschak的50nm以下50nm以下等，该体积）与渗透到几十微米的水的能力相结合，理想地适用于成像土壤胶体的元素含量。为了解决土壤胶体表面上的微量元素的结合和释放过程的问题，我们开发了一种基于微尿的XRF型细胞仪，并扩展了硬X射线荧光显微镜的应用方法朝向三维成像。在此，我们展示（a）伪谷物样品土壤胶体上的Si，K和Fe的2-D成像分布; （b）跟踪元素分布是如何动态的pH依赖性过程; （c）X射线断层扫描应用程序在3-D中呈现跟踪元素分布。我们得出结论，此处呈现的方法显示了图像和量化来自其天然水性微环境中的MAMLES的元素分布，在环境，医学和生物科学中特别重要。

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