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 12 of 12 for “"Colloidal iron"”.
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The marine biogeochemistry of dissolved and colloidal Iron
Iron is a redox active trace metal micronutrient essential for primary production and nitrogen acquisition in the open ocean. Dissolved iron (dFe) has extremely low concentrations in marine waters that can drive phytoplankton to Fe limitation, effectively linking the Fe and carbon cycles. …
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The marine biogeochemistry of dissolved and colloidal iron
Iron is a redox active trace metal micronutrient essential for primary production and nitrogen acquisition in the open ocean. Dissolved iron (dFe) has extremely low concentrations in marine waters that can drive phytoplankton to Fe limitation, effectively linking the Fe and carbon cycles. …
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The performance of potassium permanganate and hydrogen peroxide oxidation and/or alum coagulation in the removal of complexed FE(II) from drinking water
… The differentiation between particulate, colloidal, and soluble iron species was achieved through the use of 0.2 urn filters and 100K ultrafilters. Results from oxidation and ultrafiltration studies indicated incomplete complexation of the Fe(II) by DOC in solution. Following the addition …
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Surface Modifications of Iron Oxide Nanoparticles for Magnetic Imaging and Diagnosis
… This work explores and discusses potential of colloidal iron oxide nanoparticles as non-toxic MRI contrast agents for diagnosis. Novel single-nanometer iron oxide (SNIO) nanoparticles exhibited contrast enhancement in T1-weighted MRI superior than commercially used gadolinium-based contrast …
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The performance of free chlorine and chlorine dioxide oxidation and/or alum coagulation for the removal of complexed Fe(II) from drinking water
Past research regarding complexed iron has focused on the resistance to and kinetics of oxidation by O₂(aq) and the extent of stabilization. The 0.45 um filter was typically used to differentiate between dissolved and particulate iron. This research investigated Fe(II) oxidation by free chlorine …
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Influence of Operational Characterization Methods on DOM Physicochemical Properties and Reactivity with Aqueous Chlorine
… fractionated, and concentrated from environmental samples using a variety of operationally defined physical and chemical processes in order to facilitate study of specific physicochemical properties and aspects of its chemical reactivity. This study was conducted to systematically …
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Influence of protozoan grazing on the marine geochemistry of particle reactive trace metals
… and to the unique low-pH, enzyme-rich microenvironment of the grazer food vacuole. This thesis examines the role of protozoan grazers in the marine geochemistry of strongly hydrolyzed, particle-reactive trace metals, in particular Th and Fe. A series of tracer experiments was carried out in …
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The Removal and Recovery of Oxo-Anions from Aqueous Systems using Nano-Porous Silica Polyamine Composites
Environmental contamination due to anthropogenic wastewater discharges containing high concentrations of toxic metals is omnipresent in the environment. Heavy metal ions from manufacturing sources can compromise the integrity of various ecological cycles as well as negatively impacting the health …
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The Removal and Recovery of Oxo-Anions from Aqueous Systems using Nano-Porous Silica Polyamine Composites
Environmental contamination due to anthropogenic wastewater discharges containing high concentrations of toxic metals is omnipresent in the environment. Heavy metal ions from manufacturing sources can compromise the integrity of various ecological cycles as well as negatively impacting the health …
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Catalytic and magnetic properties of nanostructured materials generated by ultrasound
… be discussed in this thesis. Silica supported iron catalysts have been generated by ultrasonic irradiation of $\rm Fe(CO)\sb5$ in decane solution in the presence of silica. The iron loading on silica can be easily controlled by changing the concentration of $\rm Fe(CO)\sb5$ solution. These …
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The colloid and surface chemistry of allophane
… that allophane has unusual ion exchange and colloidal properties but much of the surface and colloid chemistry allophane was not well understood. The aim of this project was to investigate the properties of allophane with the view of developing commercial uses and also to understand better …
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The seasonal cycling and physico-chemical speciation of iron on the Celtic and Hebridean shelf seas
Shelf seas represent an important source of iron (Fe) to the open ocean. Additionally, shelf seas are highly productive environments which contribute to atmospheric carbon dioxide drawdown and support large fisheries. The work presented in this thesis describes the seasonal cycle of Fe in the …