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 20 of 37 for “"dissolved iron"”.
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Buildup/Washoff Model for Dissolved Iron in Stormwater Runoff
… the calibration of the Buildup and Washoff for dissolved iron. The test site located at the intersection of the Interstate-10 and Interstate-610, New Orleans, Louisiana. Storm water runoff from the examined elevated roadway section was analyzed for 14 storm events. The model used a linear …
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Determination of Dissolved Iron Speciation in the North East Atlantic Ocean by Flow Injection Chemiluminescence
The knowledge of iron biogeochemistry is constrained by paucity in the understanding of its uptake, transport and the partitioning of the element between different phases, redox states and coordination sites. The work presented in this thesis describes the optimisation and evaluation of a Flow …
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Formation of authigenic minerals during microbial degradation in artificial marine media
… my research include: 1) How does the presence of dissolved iron influence the degradation and/or protection of organic matter within sediments? 2) How does dissolved iron influence the development of authigenic minerals? 3) How do microbial metabolisms affect dissolved iron concentrations and …
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Implementation of a method to determine sub-nanomolar concentrations of iron in seawater and its application to the study of marine iron biogeochemistry at the ocean-shelf interface
… was to improve our understanding of the marine iron cycle using a newly implemented technique to measure dissolved iron in seawater. The setting up of a flow-injection analyser with chemiluminescence detection (FIACL) for Fe(II) proved to be non-trivial. Extensive work was undertaken to solve …
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Modelling the speciation and biogeochemistry of iron in oceanic surface waters at the Bermuda Atlantic Time-series Study site
By means of numerical modelling the cycling of iron between its various physical (dissolved, colloidal, particulate) and chemical (redox state and organic complexation) forms in the upper mixed layer of the ocean is analysed. Using the model an initial quantitative assessment is made of how this …
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Biological Iron Limitation within Lake Superior's Watershed: Oligotrophic Algal Blooms Along a Land to Lake Gradient
… of freshwater literature highlight phytoplankton iron limitation in systems of varying hydrology and trophic status. Furthermore, global trends of increased dissolved iron in lakes could play an important role in relieving iron limitation. Concurrent rises in oligotrophic harmful algal blooms …
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SEASONAL BIOCHEMISTRY IN THE SEDIMENTS OF THE GREAT BAY ESTUARINE COMPLEX, NEW HAMPSHIRE
… pore water concentrations of sulfate, chloride, iron and organic carbon, sedimentary concentrations of acid-volatile sulfides, and the abundance of sulfate-reducing bacteria were also made.</p><p>Average annual sulfate reduction at JEL was 5 times more rapid than at SQAUM (140 vs 30 …
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The Biogeochemistry of iron, zinc and cobalt in the Atlantic Ocean: the Atlantic Meridional Transect and UK GEOTRACES sections
… Earth’s primary production occurs in marine environments, primarily by phytoplankton. The trace metal micronutrients iron, zinc and cobalt are known to exert a significant biological control on phytoplankton productivity by serving as essential active centres in enzymatic processes such as …
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Primary productivity and its variability in the Atlantic Southern ocean
… Southern Ocean are light and nutrient (mainly dissolved iron) limitation ( Boyd , 2002; Mitchell et al., 1991), which have varying limiting roles over the growing season ( Boyd, 2002; Swart et al., 2014). This research commenced with an investigation of the meridional characteristics of primary …
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Not all models are created equal: assessing parameterisations of iron dynamics in ocean biogeochemical models
Iron is one of the most commonly studied trace metals as it exerts a significant influence on ocean productivity, carbon sequestration as well as modulating atmospheric CO2 concentrations. As iron is such a vital nutrient for biogeochemical processes it is often included as a variable in ocean …
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Continued optimization of a microelectrolysis treatment process for removal of arsenic from landfill gas condensate, characterization of materials, and evaluation of Fe as a predictor of treatment monitoring
… treatment that uses a combination of zero-valent iron (ZVI) and granular activated carbon (GAC). This study compared the performance of alternative types of ZVI/GAC media and examined effects of other treatment variables including pH, agitation methods, and media cycling. This study also addressed …
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Marine Biogeochemistry Studies of Iron and Hydrogen Peroxide using Flow Injection-Chemiluminescence
Iron is an essential micronutrient for the growth of planktonic species. It is an integral element of numerous enzymes and proteins with important functions in photosynthesis and respiratory electron transport. In contrast to iron, hydrogen peroxide (H202 is ubiquitous in seawater. Phytoplankton …
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A methodology for studying denitrification by recently formed sulfides
… sulfide species, such as hydrogen sulfide (H2S), iron monosulfide (FeS), mackinawite (FeS), and greigite (Fe3S4). The objective of this research was to design and begin implementing a methodology for investigating the effects of recently formed sulfides on denitrification. </p><p> In order to …
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Iron biogeochemistry in (sub-) Polar waters
Iron represents an important control on primary production in high nutrient low chlorophyll<br/>(HNLC) regimes and has received considerably attention during the last two decades. This<br/>work has focussed on the biogeochemistry of iron in two oceanic environments; the high<br/>latitude North …
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A modeling study of the marine biogeochemistry, plankton dynamics, and carbon cycle on the continental shelf off the West Antarctic Peninsula
… by variability in the glacial sources of dissolved iron. Seasonal progression of the phytoplankton bloom is well represented in the model, and values of vertically integrated net primary production (NPP) are largely consistent with observations. Although a bias towards lower surface …
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A modeling study of the marine biogeochemistry, plankton dynamics, and carbon cycle on the continental shelf off the West Antarctic Peninsula
… by variability in the glacial sources of dissolved iron. Seasonal progression of the phytoplankton bloom is well represented in the model, and values of vertically integrated net primary production (NPP) are largely consistent with observations. Although a bias towards lower surface …
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Mechanisms Causing Ferric Staining in the Secondary Water System of Brigham City, Utah
… in the reservoir chemistry create an environment conducive to dissolving iron from the iron-rich sediments, which subsequently precipitate during irrigation, resulting in a staining event. These conditions are produced by chemical and biological decomposition of organic matter, coupled …
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Co-optimizing silicon solar cell processing for efficiency and throughput
… efficiency. Parts per trillion concentrations of iron impurities in the silicon material can severely limit solar cell efficiency. Iron can be found in both precipitated and point defect form in silicon. Both forms are detrimental to final solar cell efficiency, but their negative impact can be …
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Molecular determination of marine iron ligands by mass spectrometry
… of biologically important metals such as iron, copper, cobalt, and zinc. In marine environments where the availability of iron limits microbial growth and carbon fixation rates, the ability to access organically bound iron confers a competitive advantage. Thus, the compounds that microbes …
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