Uranium and uranyl luminescence in agate/chalcedony

2015 ◽  
Vol 79 (4) ◽  
pp. 985-995 ◽  
Author(s):  
Jens Götze ◽  
Michael Gaft ◽  
Robert Möckel
Keyword(s):  
Inductively Coupled Plasma ◽  
Electron Transition ◽  
Uranium Content ◽  
Systematic Investigation ◽  
Uranyl Ion ◽  
Inductively Coupled ◽  
Spatially Resolved ◽  
Plasma Mass Spectrometry ◽  
Alteration Processes ◽  
Host Rocks

AbstractA systematic investigation of agates from different occurrences in Europe, Northern and Southern America reveals that macrocrystalline quartz and chalcedony within them have an unusually high uranium content. Whereas agates may contain >70 ppm of U, quartz from magmatic and metamorphic rocks as well as pegmatite quartz commonly exhibit U concentrations at sub-ppm levels. Spatially resolved trace-element analyses by laser ablation inductively coupled plasma mass spectrometry show that the distribution of U within the agate samples is heterogeneous and coincides with the structural banding. The results indicate that U is incorporated into agate as uranyl ions. These ions, which are bound to the silica surface, are interpreted to originate from the parallel accumulation of Si and U by alteration processes of surrounding host rocks during agate formation.The uranyl ion is the cause of greenish photoluminescence (PL) in agate, which can only be excited by short wavelengths (<300 nm). The green PL is due to the electron transition from an excited to a ground state of the uranyl ion and is shown by a typical emission line at ∼500 nm accompanied by several equidistant lines. These are due to the harmonic vibration of oxygen atoms along the uranyl axis. Luminescence can be detected in samples with a U content down to the 1 ppm level.

scholarly journals Effective processing and evaluation of chemical imaging data with respect to morphological features of the zebrafish embryo

2021 ◽  
Author(s):  
Katharina Halbach ◽  
Timothy Holbrook ◽  
Thorsten Reemtsma ◽  
Stephan Wagner
Keyword(s):  
Inductively Coupled Plasma ◽  
Zebrafish Embryo ◽  
Statistical Significance ◽  
Software Tool ◽  
Chemical Imaging ◽  
Imaging Data ◽  
Inductively Coupled ◽  
Spatially Resolved ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

AbstractA workflow was developed and implemented in a software tool for the automated combination of spatially resolved laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) data and data on the morphology of the biological tissue. Making use of a recently published biological annotation software, FishImager automatically assigns the biological feature as regions of interest (ROIs) and overlays them with the quantitative LA-ICP-MS data. Furthermore, statistical tools including cluster algorithms can be applied to the elemental intensity data and directly compared with the ROIs. This is effectively visualized in heatmaps. This allows gaining statistical significance on distribution and co-localization patterns. Finally, the biological functions of the assigned ROIs can then be easily linked with elemental distributions. We demonstrate the versatility of FishImager with quantitative LA-ICP-MS data of the zebrafish embryo tissue. The distribution of natural elements and xenobiotics is analyzed and discussed. With the help of FishImager, it was possible to identify compartments affected by toxicity effects or biological mechanisms to eliminate the xenobiotic. The presented workflow can be used for clinical and ecotoxicological testing, for example. Ultimately, it is a tool to simplify and reproduce interpretations of imaging LA-ICP-MS data in many applications. Graphical abstract

Geochemistry of major, trace and rare earth elements in coals from the Tazareh mine, eastern Alborz coalfield, NE Iran

2020 ◽  
Vol 20 (3) ◽  
pp. 381-398
Author(s):  
Afieh Tatar ◽  
Masood Alipour-Asll
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Inductively Coupled Plasma ◽  
Hanging Wall ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Humid Climate ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry ◽  
Host Rocks

The Tazareh mine in the eastern Alborz coalfield is one of the most important coal-producing areas in Iran and contains medium volatile (19.1–31.5%), low sulfur (0.015–0.491%) and variable ash yield (3–31.5%) bituminous coal. In this research, a total of 21 samples were collected from the Tazareh coal layers, footwall and hanging wall. The concentrations of rare earth elements (REEs) and other elements were determined by inductively coupled-plasma mass spectrometry (ICP-MS) and inductively coupled plasma-optical emission spectrometry (ICP-OES). Additionally, traditional features of coal and host rocks were studied by X-ray diffraction (XRD) and petrographic methods. The concentration coefficient (CC) of Tazareh coal samples show that Sc (CC = 2.71), Be (CC = 2.68) and Ni (CC = 2.30) are slightly enriched, Li, Cr, Pb, Sb, V, Cs, As, Co, Cu, Nb, Y, Rb, Tl, REE, Zr, Zn, Ta and Th (0.5 < CC < 2) are normal, and concentrations of remaining trace elements are lower than the average world hard coals. The NASC-normalized REEs pattern and (La/Yb)n, (La/Sm)n, (Gd/Yb)n, and (La/Lu)n ratios in the Tazareh coal confirm that the LREEs are enriched relative to HREEs, and comparatively, the degree of LREE enrichment of coal is lower than that of coal-bearing shale and argillaceous shale. Coal-bearing strata were deposited under oxic conditions in a warm-humid climate. The average content of REE + Y in Tazareh coal (58 ppm) is lower than world coals (83 ppm), while Sc is enriched.

Spatially Resolved Measurements of Size and Velocity Distributions of Aerosol Droplets from a Direct Injection Nebulizer

1993 ◽  
Vol 47 (5) ◽  
pp. 575-583 ◽  
Author(s):  
Sam C. K. Shum ◽  
Steve K. Johnson ◽  
Ho-Ming Pang ◽  
R. S. Houk
Keyword(s):  
Inductively Coupled Plasma ◽  
Direct Injection ◽  
Axial Position ◽  
Particle Analysis ◽  
Inductively Coupled ◽  
Spatially Resolved ◽  
Analyte Signal ◽  
Aqueous Solvent ◽  
Plasma Mass Spectrometry ◽  
Aerosol Plume

Aerosol droplet sizes and velocities from a direct injection nebulizer (DIN) are measured with radial and axial spatial resolution by phase Doppler particle analysis (PDPA). The droplets on the central axis of the spray become finer and their size becomes more uniform when ≍ 20% methanol is added to the usual aqueous solvent. This could explain why the analyte signal is a maximum at this solvent composition when the DIN is used for inductively coupled plasma-mass spectrometry (ICP-MS). Mean droplet velocities are 12 to 22 ms−1 with standard deviations of ±4 to ±7 ms−1. The outer fringes of the aerosol plume tend to be enriched in large droplets. The Sauter mean diameter ( D3,2) and velocity of the droplets also vary substantially with axial position in the aerosol plume.

Extravasation of Pt-based chemotherapeutics – bioimaging of their distribution in resectates using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS)

Metallomics ◽  
2015 ◽  
Vol 7 (3) ◽  
pp. 508-515 ◽  
Author(s):  
Alexander E. Egger ◽  
Christoph Kornauth ◽  
Werner Haslik ◽  
Stephan Hann ◽  
Sarah Theiner ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Laser Ablation ◽  
Inductively Coupled Plasma ◽  
Drug Application ◽  
Inductively Coupled ◽  
Spatially Resolved ◽  
Icp Ms ◽  
Plasma Mass Spectrometry

Spatially resolved quantification of platinum distribution in patients that exhibited extravasation was feasible up to 4 weeks upon drug application.

Nature and Origin of Zoned Polymetallic (Pb-Zn-Cu-Ag-Au) Veins from the Bingham Canyon Porphyry Cu-Au-Mo Deposit, Utah

2021 ◽  
Author(s):  
David H. Tomlinson ◽  
Eric H. Christiansen ◽  
Jeffery D. Keith ◽  
Michael J. Dorais ◽  
Rudy Ganske ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Chemical Characterization ◽  
Downstream Processing ◽  
Porphyry Deposit ◽  
Inductively Coupled ◽  
Porphyry Cu ◽  
Main Host ◽  
Plasma Mass Spectrometry ◽  
Host Rocks ◽  
Physical And Chemical

Abstract Polymetallic veins (Pb-Zn-Cu-Ag-Au) at the world-class Bingham Canyon, Utah, porphyry Cu-Au-Mo deposit have long been recognized, but poorly understood. They are laterally zoned outward from the center of the porphyry deposit transitioning from Fe-Cu to Pb-Zn-Cu-Ag-Au mineralization. Physical and chemical characterization of these polymetallic veins provide insight into the origin, timing, and controls of ore deposition. These sheared, sulfide-rich, NE/SW- trending veins are dominated by pyrite and multiple generations of quartz, with lesser amounts of other sulfide and gangue minerals. Gold (0.27–4.61 ppm) provides the most value to the ore, though the veins contain substantial Cu and Ag as well. Host rocks include Eocene monzonite and Paleozoic limestone and quartzite—all of which can contain economic ore lodes. Associated alteration is predominantly sericitic and argillic, with mineralization in wall rocks restricted to 1.5 m from the vein margins. Mineral assemblages vary with distance from the center of the main porphyry Cu-Au-Mo deposit and the modal abundances are dependent on the host rock. The appearance of both galena and sphalerite (and tennantite to an extent) occur along a boundary that creates a halo around the center of the associated porphyry deposit. This is accompanied by a shift in metal ratios and an increased concentration of chalcophile trace elements in sulfides from the polymetallic veins as determined by electron microprobe analyses (EMPA) and laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). Significant hosts of Ag include galena and tennantite, and Cu is hosted primarily in chalcopyrite, tennantite, and sphalerite. The main host of Au could not be determined, but Au could be focused along fractures or hosted in inclusions found in pyrite. The δ34S values of vein pyrite have a narrow range (2.3–3.4‰) suggestive of a magmatic source, whereas δ18O of quartz is more variable (11.5–14.0‰). These values are similar to several other polymetallic vein deposits associated with porphyry Cu deposits. This can be explained by fractionation of magmatic fluids at lower temperatures (350°–250°C) and/or mixing with exchanged 18O-rich meteoric water. Ore grades (Cu, Ag, Au) improve with distance from the center of the porphyry deposit; however, this is accompanied by higher concentrations of deleterious elements (e.g., Pb, As, Bi) for downstream processing. These polymetallic veins were created sequentially throughout the formation of the deposit. Initial joints in the sedimentary rocks probably formed as a result of emplacement of a barren equigranular monzonite intrusion, with continued dilation and propagation in all host rocks with each subsequent intrusion. The northeast orientation of the joints was controlled by the regional stress field, which is more apparent distal to the center of the Bingham deposit. Vein mineralization appears to postdate all intrusions and the porphyry Cu-Au mineralization; however, it may be related to the late fluids responsible for Mo mineralization in the main porphyry orebody that followed intrusion of the quartz latite porphyry. Quartz-sericite-pyrite mineralization associated with the veins precedes galena-sphalerite-pyrite mineralization. This was followed by late precipitation of chalcopyrite and tennantite and late normal faulting.

Simultaneous 3-dimensional elemental imaging with LIBS and LA-ICP-MS

2014 ◽  
Vol 29 (7) ◽  
pp. 1292-1298 ◽  
Author(s):  
Jose R. Chirinos ◽  
Dayana D. Oropeza ◽  
Jhanis J. Gonzalez ◽  
Huaming Hou ◽  
Mark Morey ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Major And Trace Elements ◽  
Laser Induced Breakdown Spectroscopy ◽  
3 Dimensional ◽  
Inductively Coupled ◽  
Breakdown Spectroscopy ◽  
Spatially Resolved ◽  
Icp Ms ◽  
Laser Induced Breakdown ◽  
Plasma Mass Spectrometry

Laser Induced Breakdown Spectroscopy (LIBS) and Laser Ablation Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS) are used simultaneously for spatially resolved mapping of major and trace elements and isotopes within aBastnäsiterare earth ore sample.

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