Three dimensional subsurface elemental identification of minerals using confocal micro-X-ray fluorescence and micro-X-ray computed tomography

Cordes, Nikolaus L.; Seshadri, Srivatsan; Havrilla, George J.; Yuan, Xiaoli; Feser, Michael

doi:10.1016/j.sab.2014.12.006

Cited by 19 publications

(11 citation statements)

References 25 publications

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“…CXMFI provides compositional and structural information from precise locations on the surface of, and within, intact particles, with greater spatial precision than can be obtained using conventional micro x-ray fluorescence (µ-XRF) methods [18]. Limited applications of CXMFI are reported for natural materials; examples include the characterization of Se accumulation in fish eye lens [19]; W, Pt, and Fe in particles embedded in a mineralogical matrix [20]; K, Ca, and Fe in rice grains [21]; and U-Th-Pb for dating of geological materials [22].…”

Section: Introductionmentioning

confidence: 99%

Stabilization of mercury in sediment by using biochars under reducing conditions

Liu

Ptacek

Blowes

et al. 2017

Journal of Hazardous Materials

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Mercury (Hg) is widely distributed in different localities around the world and poses a serious health threat to humans, especially when ingested in the form of methylmercury (MeHg). Efforts have been directed toward decreasing the production of MeHg by converting Hg to stable forms. Activated carbon and biochar have been evaluated as stabilization agents for Hg in contaminated sediments. However, the long-term fate of Hg stabilized by these materials remains unclear. Here, we compare the effectiveness of Hg stabilization using two biochars prepared from switchgrass at 300°C (lowT) and 600°C (highT). Experiments were conducted by co-blending biochars and sediment for >600 d under anaerobic conditions. Aqueous concentrations of total Hg and MeHg were greatly reduced in the presence of biochars, with the exception of a spike in MeHg concentration observed at ∼440 d in the high-T biochar system. Hg co-occurs with S, Fe, Cu, and other elements within the plant structure of low-T biochar particles, but primarily on the outer surfaces of high-T biochar particles. Our results indicate that the stabilization of Hg may be through an early-stage diagenetic process, suggesting that the stabilization of Hg by biochar may be effective over long time frames.

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Section: Introductionmentioning

confidence: 99%

Stabilization of mercury in sediment by using biochars under reducing conditions

Liu

Ptacek

Blowes

et al. 2017

Journal of Hazardous Materials

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“…However, when the confocal 3D‐μXRF spectrometer used to retrieve the information covered in the printed paper, the powdered ink used in the printer must contain some element that could be detected by the confocal 3D‐μXRF setup and not contain in the paper. Last but not least, the application of the confocal 3D‐μXRF spectrometer could be expanded to the identification of the spatial distribution of metal elements of the painting, mineral, tablet, forensic sample, and so on …”

Section: Resultsmentioning

confidence: 99%

Confocal three‐dimensional micro‐X‐ray fluorescence spectroscopy used to retrieve the information covered in printed paper

et al. 2019

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Confocal three‐dimensional micro‐X‐ray fluorescence (3D‐μXRF) spectroscopy based on laboratory X‐ray tube was employed to unravel the three‐dimensional (3D) distribution of metal element (Fe) inner the paper. According the distribution of the Fe in the paper, the information covered in the printed paper could be retrieved. Before the experiment, the performance of the confocal 3D‐μXRF setup was described. The two‐dimensional (2D) mapping of printed character covered by the opaque tape and contaminated by the black ink was scanned by confocal 3D‐μXRF setup. Furthermore, 2D and 3D mapping of a printed number covered by the paper with printed character was performed by micro‐X‐ray fluorescence and confocal 3D‐μXRF setup, respectively. The scanning results indicated that confocal 3D‐μXRF was more suitable for retrieving the information covered in the paper. Furthermore, the confocal 3D‐μXRF setup has potential application on the identification of unseen letter or painting that was covered by others, such as ink.

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“…Los Alamos National Laboratory has a customdesigned confocal micro-XRF instrument. Micro-XRF spectrometry [8][9][10][11][12][13][14][15] measures the emitted X-ray photons of a material excited by an X-ray source. Our system uses a Mo tube (25 W), with a pair of polycapillary optics, one on the source and the other on the detector.…”

Section: Iid1 Particle Inclusion Identification Using Confocal Xrfmentioning

confidence: 99%

Material Characterization of Hierarchical Tunable Pore Size Polymer Foams Used in the MARBLE Mix Morphology Experiment

Cárdenas

Murphy

Kuettner

et al. 2020

Fusion Science and Technology

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One of the great challenges of inertial confinement fusion and high energy density experiments is understanding the effects of mix on thermonuclear burn. The MARBLE campaign, conceived at Los Alamos National Laboratory, aims to gather new insights into this issue by utilizing unique target capsules containing polymer foams of variable pore sizes, tunable over an order of magnitude. Such capsules allow the degree of initial heterogeneity to be controlled experimentally for the first time. Here, we describe the various characterization efforts used to gain understanding of the chemical structure and behavior of the foam. Previous experiments were not sensitive to foam physical properties, and the MARBLE platform has aided in the development of techniques to measure foam properties such as deuterium content, density variation, hydrogen adsorption, and pore size and volume distribution.

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Three dimensional subsurface elemental identification of minerals using confocal micro-X-ray fluorescence and micro-X-ray computed tomography

Cited by 19 publications

References 25 publications

Stabilization of mercury in sediment by using biochars under reducing conditions

Stabilization of mercury in sediment by using biochars under reducing conditions

Confocal three‐dimensional micro‐X‐ray fluorescence spectroscopy used to retrieve the information covered in printed paper

Material Characterization of Hierarchical Tunable Pore Size Polymer Foams Used in the MARBLE Mix Morphology Experiment

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