A5072746171- Geochemistry and Geologic Mapping
- X-ray Spectroscopy and Fluorescence Analysis
- Metal Extraction and Bioleaching
- Geological and Geochemical Analysis
- Heavy metals in environment
- Spectroscopy and Quantum Chemical Studies
- Cultural Heritage Materials Analysis
- X-ray Diffraction in Crystallography
- Soil Geostatistics and Mapping
- Radioactive element chemistry and processing
- Analytical chemistry methods development
- Iron oxide chemistry and applications
- Hydrocarbon exploration and reservoir analysis
- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Thermodynamic properties of mixtures
- Odor and Emission Control Technologies
- Analytical Chemistry and Chromatography
- Geochemistry and Elemental Analysis
- Arsenic contamination and mitigation
- Conservation Techniques and Studies
- Diffusion Coefficients in Liquids
- Adsorption, diffusion, and thermodynamic properties of materials
- Mercury impact and mitigation studies
- Chemical and Physical Properties in Aqueous Solutions
Western University
2018-2024
Western University of Health Sciences
2019
Canadian Light Source (Canada)
2011-2017
Saskatoon Medical Imaging
2015
The Ohio State University
2004-2008
University of Ottawa
2001
The aqueous sulfite ion reacts with Hg2+(aq) to form 1:1 and 2:1 coordination complexes. Hg(SO3)22- complex is redox stable. However, dissociation of a ligand forms redox-unstable HgSO3. Under conditions where predominates, the rate reduction mercuric Hg0 by coordinated depends inversely on concentration uncoordinated sulfite, while it unaffected amount liberated dissociation. Analysis kinetics yields sequential binding constants K1 = 2.1 × 1013 K2 1.0 1010 at μ 0.10 M. These values lead...
Abstract The Upper Cretaceous Prince Creek Formation (PCF) of northern Alaska offers a unique glimpse into high‐latitude, non‐marine vertebrate assemblages, providing critical data on polar ecosystems during the late Campanian ( c . 73 Ma). This study presents comprehensive taxonomic assessment fish fossils from PCF, including macrofossils and microfossils obtained through bulk sampling. assemblage demonstrates lower species richness compared with penecontemporaneous formations in...
The reaction between methanol and sulfuric acid (SA) was investigated using Raman vibrational broad bandwidth sum frequency generation spectroscopies. Evidence for the formation of methyl hydrogen sulfate (MHS) obtained by presence a new peak in 800 cm-1 region, not present either neat or concentrated spectra. This is attributed to singly bonded OSO symmetric stretch MHS. maximum yield MHS with large SA excess (7 SA/1 methanol) shown be (95 ± 5)% at −(15 2) °C. No evidence found suggest...
XANES and Zatka speciation methods were compared for application in epidemiology of occupational aerosols from sulphidic nickel production.
The organization of 1-butanol and 1-hexanol at the air-liquid interface aqueous, aqueous ammonium bisulfate, sulfuric acid solutions was investigated using vibrational broad bandwidth sum frequency generation spectroscopy. There is spectroscopic evidence supporting formation centrosymmetric structures surface pure butanol hexanol. At most solution surfaces, molecules organize in all-trans conformations. This suggests that self-aggregates. spectrum for 0.052 M 59.5 wt % different from other...
The uptake of methanol at the air-liquid interface 0-96.5 wt % sulfuric acid (H2SO4) solutions has been observed directly using vibrational sum frequency generation (VSFG) spectroscopy. As concentration H2SO4 increases, VSFG spectra reveal a surface reaction between and to form methyl hydrogen sulfate. is saturated with species after 15 min. into by Raman spectroscopy was also occurred on much longer time scale. This suggests that diffusion-limited.
The diffusion of methanol into 0-96.5 wt % sulfuric acid solutions was followed using Raman spectroscopy. Because reacts to form protonated (CH 3OH 2 (+)) and methyl hydrogen sulfate in H 2SO 4 solutions, the reported coefficients, D, are effective coefficients that include all species diffusing 4. method first verified by measuring D for water. value obtained here, = (1.4 +/- 0.6) x 10 (-5) cm (2)/s, agrees well with values found literature. 39.2-96.5 range from (0.11-0.3) maximum occurring...
XAFS spectroscopy has been used to determine the Ni species in particulate matter collected on quartz thimble filters stacks of eight residual (No. 6 fuel) oil-burning electric utility steam-generating units. Proper speciation nickel emitted is necessary correctly anticipate potential health risks. Analysis spectroscopic data using least-squares linear combination methods and a newly developed method specific for small quantities sulfide compounds such emissions show that potentially...
Peakaboo is a platform for the analysis of full spectrum synchrotron X-ray fluorescence (XRF) map data. It offers robust, automated fitting XRF spectral peaks, increasing sensitivity to trace chemical elements. Large arrays data can also be processed into element maps define spatial relationships. The modifications introduced since 2017 are particularly designed help new users become rapidly competent in handling complex spectra. Some most important innovations software described below....
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A non-destructive SR-WD-XRF method for quickly measuring Pt in large sample suites of ancient Roman gold coins.
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Application of HERFD to SR-XRF imaging and XANES enables precise quantification trace Pt in Late Roman Byzantine gold solidi, revolutionizing our understanding minting practices, economic shifts, the emergence new sources.
Journal Article Bubbles in the Bullion: Micro-CT Imaging of Internal Structure Ancient Coins Get access Lisa L Van Loon, Loon LISA CAN Analytical Solutions Inc., Saskatoon, SKDepartment Anthropology, Western University, London, ONDepartment Earth Sciences, ON Corresponding author: lisavanloon@gmail.com Search for other works by this author on: Oxford Academic Google Scholar Andrew J Nelson, Nelson Department Ute Wartenberg Kagan, Kagan American Numismatic Society, New York, NY Keith Barron,...
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Journal Article Application of Innovative Geochemical and Mineralogical Techniques to Understanding the La Victoria Epithermal Gold Deposit, Peru Get access Kelsey L Rozon, Rozon Department Earth Sciences, Western University, London, ON, Canada Search for other works by this author on: Oxford Academic Google Scholar Neil R Banerjee, Banerjee Corresponding author: neil.banerjee@uwo.ca Lisa Van Loon, Loon CanadaLISA CAN Analytical Solutions Inc., Saskatoon, SK, Bill Pearson Eloro Resources...