Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"X-ray Fluorescence Spectroscopy"”.
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Evaluation of X-ray Fluorescence Spectroscopy as a Tool for Element Analysis in Pea Seeds
X-ray fluorescence spectroscopy (XRF) is a powerful analytical tool for the determination of elemental composition of diverse materials. The principal aim of this study was to evaluate and characterize the utility and reliability of synchrotron-based XRF for use in element analysis of field pea …
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Síntese e caracterização de nanoestruturas de óxido de zinco por via úmida
… microscopy (SEM), N2 adsorption at 77K, X-ray diffraction (XRD), X-ray fluorescence spectroscopy (FRX) and UV-visible diffuse reflectance spectroscopy (DRS). The synthesis conditions allowed to obtain different morphologies, such as nanorods, nanoflowers, nanoplates. The XRD results of ZnO …
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ADVANCING METHODS FOR APPORTIONING THE SOURCES OF SEDIMENT IN RIVERS: COMBINING SPECTROSCOPY AND STABLE ISOTOPES WITH BAYESIAN MIXING MODELS
… Addressing these deficiencies, a combined X-ray fluorescence spectroscopy (XRFS) and diffuse reflectance infra-red Fourier transform spectroscopy (DRIFTS) approach is developed to rapidly, accurately and non-destructively analyse suspended particulate matter (SPM) geochemistry directly from …
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What does the analysis of copper-alloy brooches reveal about the social and economic landscapes of Early Anglo-Saxon Cambridgeshire and Suffolk?
… by analysing copper-alloy brooches using X-ray fluorescence spectroscopy. Two clusters of cemeteries, one in Cambridgeshire and the other in Suffolk, were chosen to have their brooches analysed. The results of my analysis, and other academic research were studied, to see if any connections …
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The origin and behaviour of carbonate minerals in diverse environments: from subduction zones to asteroids
… calcite-group carbonates were measured by Raman spectroscopy experiments. The effects of fluid salinity, pressure, and temperature on the aqueous solubility of rhodochrosite (MnCO3) and smithsonite (ZnCO3) and Zn complexation were unravelled using the combination of synchrotron X-ray fluorescence …
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An investigation into the determination of some volatile elements in silicate rocks employing d.c. arc emission spectroscopy in artificial atmospheres
… optical emission spectrography (O.E.S.) and X-ray fluorescence spectroscopy (X.R,F.) was investigated. X.R.F, was shown to be capable of determining Cu, Ga, Pb and Zn in normal silicate rocks and Sn, As and Ge in samples enriched in these latter three elements. Improvement of the sensitivity of …
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Lithostratigraphic and Geochemical Characterisation of the Waterberg Coalfield: Implications to Acid Mine Drainage, Limpopo Province, South Africa
… methods such as, Scanning electron microscopy, X-ray diffraction spectroscopy, X-ray fluorescence spectroscopy, proximate analysis, Modified Sobek Acid Base Accounting test as well as petrographic study. The major rock types identified in the study area included shale, sandstone and gritstone. …
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An investigation of the factors affecting the degradation of cellulose acetate artefacts in museum collections
… Micro-Fourier Transform Infrared (FTIR) Spectroscopy has been found to be an excellent technique for the identification of the base polymer in a plastic artefact, as minute samples are used. It has also been used to monitor changes in the base polymer of the plastic artefacts. Ion …
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The record of magma storage conditions in mineral compositions below a glacial to ice-free Askja volcano, Iceland
… previous data to create larger data sets of X-ray fluorescence spectroscopy, inductively coupled plasma mass spectrometry, and electron probe mineral composition data for Askja throughout the preglacial to historical time periods. The composition of data collected displays a number of trends …
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Physical and geochemical characterisation of canal sediments in the Black Country, West Midlands.
… using various analytical methods, such as X-Ray Fluorescence spectroscopy (XRF), particle size and X-ray Diffraction (XRD) for the solid-inorganic phase, Ion Chromatography (IC) and Inductively Coupled Plasma-Optical Emissions Spectroscopy (ICP-OES) for the liquid phase (pore water), Gas …
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Elemental and Molecular and Profiling of Illicit Tobacco
… the elemental profiling of tobacco using X-ray Fluorescence Spectroscopy as a rapid handheld qualitative technique, the quantification and comparison of nicotine levels within licit, illicit and niche tobacco using Gas Chromatography – Mass Spectrometry, including a single strand extraction …
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Application of Mineral Magnetic Measurements as a Pollution Proxy for Urban Road Deposited Sediment
… namely mineral magnetism, laser diffraction, X-Ray Fluorescence spectroscopy (XRF), Scanning Electron Microscopy (SEM) and Loss on Ignition (LOI), were employed to characterize sample properties. Data interrogation identified mainly weak correlations exist between most mineral magnetic …
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A Study on Supported Metal Catalysts Prepared from Colloidal Precursors
… agents, and subsequently used to produce an array of different catalysts. As support materials for the catalysts, a series of four commercially available materials were obtained, including silica, alumina, hydroxyapatite, and microcrystalline cellulose. Four novel analogues were also obtained, …
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Mixing in granular systems and applied coating technology
… processing, and pharmaceutical manufacture. X-ray Fluorescence Spectroscopy and copper tracer granules were used to study the residence time distribution of granules in a rotary drum mixer. The mean residence time is inversely related to granule particle size. Mean residence time (MRT) …
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The formation and evolution of planetary systems
… to measure its elemental abundances via X-ray fluorescence spectroscopy called REXIS was developed and built at MIT. In this part of the thesis, we investigate the ability of REXIS to constrain the composition of Bennu via fluorescence spectroscopy, as well as its potential to place Bennu …
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Design of silica-based sustainable biomaterial adsorbents from agricultural waste for the microextraction and adsorptive removal of insecticides and antibiotics from wastewater samples
… physicochemical characterization, including x-ray fluorescence spectroscopy (XRF), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM/EDS), transmission electron microscopy (TEM), and …