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 68 for “"Dissolved organic matter (DOM)"”.
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High molecular weight (HMW) dissolved organic matter (DOM) in seawater : chemical structure, sources and cycling
… high molecular weight (> 1 k Da (HMW)) dissolved organic matter (DOM) isolated from seawater in an attempt to provide new insights in to the cycling of DOM in the ocean. While a variety of sites spanning different environments (fluvial, coastal and oceanic) and ocean basins were …
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High molecular weight (HMW) dissolved organic matter (DOM) in seawater : chemical structure, dources and cycling
… high molecular weight (> 1 k Da (HMW)) dissolved organic matter (DOM) isolated from seawater in an attempt to provide new insights in to the cycling of DOM in the ocean. While a variety of sites spanning different environments (fluvial, coastal and oceanic) and ocean basins were …
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Chemical characterization of dissolved organic matter (DOM) in seawater : structure, cycling, and the role of biology
… areas relating to the characterization of dissolved organic matter (DOM): further determination of the chemical compounds present in high molecular weight DOM (HMWDOM), the cycling of individual compounds within the HMWDOM pool, and the biological controls on DOM release. The first section …
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Chemical characterization of dissolved organic matter (DOM) in seawater : structure, cycling, and the role of biology
… areas relating to the characterization of dissolved organic matter (DOM): further determination of the chemical compounds present in high molecular weight DOM (HMWDOM), the cycling of individual compounds within the HMWDOM pool, and the biological controls on DOM release. The first section …
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Isolation and physiochemical characterization of dissolved organic matter across limnic and oceanic systems
The included studies compare and contrast dissolved organic matter (DOM) from different limnic and oceanic systems in the United States, as well as a sample from Pony Lake, Antarctica. Twenty-seven samples of DOM were isolated via coupled reverse osmosis/ electrodialysis from both the Altamaha and …
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Dissolved organic material in groundwater and application of fluorescence spectroscopy coupled with EEM PARAFAC models as a means of site characterisation
The role of dissolved organic matter (DOM) in aquatic systems has been associated with numerous physiochemical processes including carbon sink, contamination indicator and important component in natural geochemical and microbial processes. However, to date research into the behaviour of DOM within …
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Optical Signatures of Bioavailable and Terrigenous Dissolved Organic Matter Across Long Island Sound and Hudson River Estuaries
… the sources, sinks, and transport pathways of dissolved organic matter (DOM) across the land–ocean aquatic continuum. By integrating observations across spatial and temporal scales, optical properties are shown to encode fundamental processes governing DOM cycling in coastal systems. Results …
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Climate Change and Dissolved Organic Matter in Subarctic Lakes: Relevance to Methylmercury Bioavailability
… uptake by phytoplankton, is regulated by dissolved organic matter (DOM). Methylmercury binds strongly with DOM, especially high-molecular weight (HMW) compounds containing reduced sulphur; this binding decreases MeHg bioavailability. Climate-induced changes were measured at the landscape …
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Behaviour of trace organics and dissolved organic matter in granular activated carbon filters for drinking water supply
… (GAC and BAC) filters are widely used to remove organic compounds from drinking water sources during municipal drinking water treatment. Common uses of GAC filters include removal of taste and odour (T&O) causing compounds such as geosmin and 2-methylisoborneol and reducing the concentration of …
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INVESTIGATING THE CONTRIBUTION OF MARINE VIRUSES TO OPTICAL BACKSCATTER IN THE <0.2 µM FRACTION OF SEAWATER
… and nutrient cycles through the liberation of dissolved organic matter (DOM) through the lysis of their numerically dominant hosts (i.e. bacteria and phytoplankton). Despite their importance, little is known about how viruses contribute to seawaters inherent optical properties (IOP) of …
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Effect of organic nutrient perturbation on microbial community dynamics and composition in Scottish coastal waters
This study investigates the effect of organic nutrient perturbation on the<br/>dynamics of marine microbial communities, adopting three different approaches. A field study was conducted on the west coast of Scotland, in two contrasting locations, including a fish farm anticipated as a point source …
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Caractérisation de la matière organique dissoute de l'estuaire du Saint-Laurent par un système HPLC-FTIR
Because of its complex and altered nature, dissolved organic matter (DOM) in aquatic environments is very difficult to characterize. Consequently, a large portion of its composition remains unknown. However, the coupling of analytical techniques can provide structural information about this complex …
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Spatial and Temporal Transitions in the Composition and Transport of Carbon under Variable Flow
Recent studies have focused on dissolved organic matter (DOM) cycling throughout river corridors or in reservoirs, but few have explored DOM cycling in commonplace but understudied run-of-river (ROR) reservoir systems. Impoundments disrupt river flow patterns, as they increase hydraulic residence …
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Physical-chemical treatment of landfill leachate : technological performance, spectral characterization and cost estimations
… leachate given the presence of recalcitrant organic compounds and low leachate biodegradability. As such, post-treatment is required to meet discharge standards. Therefore, this PhD thesis focused on the (post)-treatment of raw and biologically treated landfill leachate using four …
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Evaluation of hybrid treatment configurations of granular activated carbon and alternative adsorbents for per- and polyfluoroalkyl substances removal from surface water and groundwater
… that contain competitive adsorbates such as dissolved organic matter (DOM) and/ or total dissolved solids (TDS). This study evaluated a relatively new selective adsorbent (Fluoro-Sorb®) in combination with lead-lag column configurations to improve the treatment of challenging waters. A rapid …
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The development of steady State and lifetime fluorescence instruments for real time in situ aquatic chemistry measurements
… repackages the sensor components to study dissolved organic matter (DOM) in tropical Southeast Asia peatland rainforests. This instrument is optimized for low power consumption over long deployments to remote locations. Two field trials in Pontianak Indonesia with durations of two and six …
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Dissolved Organic Matter Sources from Soil Horizons with Varying Hydrology and Distance from Wetland Edge
… carbon dynamics, particularly regarding dissolved organic matter (DOM) transport and transformation. The organic matter (carbon) that accumulates in wetland soils may be released into water, generating DOM. DOM is mobile and reactive, making it influential to aquatic metabolism and water …
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Microbial cycling of marine high molecular weight dissolved organic matter
… biogeochemical cycles in the ocean. Marine dissolved organic matter (DOM) – a reservoir of organic solutes and colloids derived from plankton is a major source of carbon, nutrients, and energy to microbial communities. The biological transformation and remineralization of DOM sustains marine …
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Investigating dissolved organic matter cycling in High Arctic ponds and soils
As the most bioavailable fraction of organic matter, dissolved organic matter (DOM) plays an important role in the carbon (C) cycle. Heterotrophic microorganisms degrade DOM and release it to the atmosphere as carbon dioxide (CO2) under oxygenated conditions. However, some DOM may be more readily …
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Between a rock and a hard place: the chemistry, biology, and lability of glacial meltwaters in the American West
… pH, heavy metals, nutrients, complexity of dissolved organic matter (DOM), and bacterial richness and diversity) differed significantly between glacier and rock glacier meltwaters, while other characteristics (Ca2+, Fe3+, SiO2 concentrations, reactive nitrogen, and microbial processing of …
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