Browsing Earth and Environmental Sciences by Title
Now showing items 81-100 of 434
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Dissolved inorganic carbon and alkalinity fluxes from coastal marine sediments: model estimates for different shelf environments and sensitivity to global change
(European Geosciences Union, 2013-01-24)We present a one-dimensional reactive transport model to estimate benthic fluxes of dissolved inorganic carbon (DIC) and alkalinity (AT) from coastal marine sediments. The model incorporates the transport processes of ... -
Dissolved inorganic nitrogen cycling in a river receiving wastewater: the response to changes in wastewater treatment effluent
(University of Waterloo, 2016-01-27)Nitrogen is an essential element for all life forms, but when in excess in an aquatic ecosystem, it can cause an imbalance in the trophic status. A significant amount of nitrogen is released into the environment by wastewater ... -
Dissolved Organic Matter in the Anthropogenically Impacted Grand River and Natural Burnt River Watersheds
(University of Waterloo, 2012-01-03)Dissolved organic carbon (DOM) is one of the largest cycled organic carbon pools on Earth and an important biogeochemical factor in aquatic systems. DOM can act as an energy source for microorganisms, alter the depth of ... -
Dissolved Organic Matter in the Canadian Arctic & Sub-Arctic: Importance of DOM Quality & Quantity in a Warming Climate
(University of Waterloo, 2019-08-28)Dissolved organic matter (DOM) is a ubiquitous component of aquatic and terrestrial systems and an important constituent that can influence aquatic health and drinking water quality. For instance, DOM can act as an important ... -
Early Paleozoic Ocean Redox Dynamics: Perspectives from Uranium Isotopes of Sedimentary Rocks
(University of Waterloo, 2022-11-23)The trajectory of global ocean oxygenation could have greatly influenced the metazoan evolutions because O2 could provide valuable energy to support biological activities. Remarkable metazoan diversifications occurred ... -
Earth and environmental science immersive learning experiences using a Google Expedition Kit
(2019-07-31)How do we engage and motivate students in immersive learning experiences that are otherwise impossible (i.e. Geologic History of the Grand Canyon) or not feasible (i.e. 3D perspective of volcanoes of the world) or invisible ... -
Ecosystem Services: Linking ecohydrology with economic valuation
(University of Waterloo, 2018-10-17)Economic valuation of ecosystem services has become a dominant model for environmental management at local, regional and global scales. However, policy-makers at all scales take these value estimates with a pinch of salt. ... -
Effect of composting and amendment with biochar and woodchips on the fate and leachability of pharmaceuticals in biosolids destined for land application
(Elsevier, 2022-03)Land application of biosolids can improve soil fertility and enhance crop production. However, the occurrence and persistence of pharmaceutical compounds in the biosolids may result in leaching of these contaminants to ... -
Effect of ethanol on BTEX biodegradation in aerobic aquifer systems
(University of Waterloo, 2008-01-04)Ethanol can affect the biodegradation of gasoline hydrocarbons in groundwater. High concentrations of ethanol can be toxic to subsurface microorganisms that are otherwise capable of degrading hydrocarbons, such as benzene, ... -
Effect of H2 Pressure on Hydrogen Absorption and Granular Iron Corrosion Rates
(University of Waterloo, 2014-01-08)Hydrogen gas production occurs in permeable reactive iron barriers (PRBs) due to the anaerobic corrosion of granular iron. Once produced, this hydrogen gas can have detrimental physical effects on PRB performance. ... -
Effect of organic carbon substrates on denitrification rates in sediment
(University of Waterloo, 2014-01-24)Nitrate (NO3-) is a ubiquitous groundwater contaminant in agricultural and wastewater discharge areas. The prediction of microbial mediated NO3- removal in subsurface environments requires an understanding of the rates ... -
The Effect of Shock Metamorphism on Zircon of the Huronian Supergroup in proximity to the Sudbury Impact, Ontario, Canada
(University of Waterloo, 2019-09-26)U-Pb geochronology of zircon is a widely used tool, but damage to the crystal lattice of zircon and loss of Pb by impact-related shock metamorphism can affect the interpretation of U-Pb isotope data. Five samples of the ... -
The Effect of Volatiles (H2O, Cl and CO2) on the Solubility and Partitioning of Platinum and Iridium in Fluid-Melt Systems
(University of Waterloo, 2010-09-01)Volatiles are a fundamental component of the Magmatic-Hydrothermal model of platinum group element (PGE) ore deposition for PGE deposits in layered mafic intrusions such as Bushveld and Stillwater. Volatiles have the ... -
Effectiveness of Organic Carbon Cover Systems on Sulfide-rich Tailings
(University of Waterloo, 2021-09-27)Acid mine drainage (AMD) occurs when sulfide minerals oxidize; generating low pH water and the release of dissolved metals. This phenomena is of primary concern in the mining industry, where the future loading of dissolved ... -
The Effectiveness of Persulfate and Hydrogen Peroxide on the Oxidation of Hydrocarbon Contaminants at 30°C: A Study with Focus on the Performance of Compound Specific Isotope Analysis
(University of Waterloo, 2018-07-05)Two oxidants, persulfate and hydrogen peroxide, were used to investigate the effectiveness of in-situ chemical oxidation (ISCO) on target contaminants (sourced from industrial wastewater) in saline and high-temperature ... -
The Effectiveness of Persulfate in the Oxidation of Petroleum Contaminants in Saline Environment at Elevated Groundwater Temperature
(University of Waterloo, 2011-12-08)In the past few decades, several aqueous oxidants have been employed (e.g., permanganate, persulfate) to remediate petroleum hydrocarbons. However, the majority of the research in this field has been focused primarily on ... -
The Effects of Entrapped Gas Bubbles on Physical Flow and Dissolved Gas Transport - A Sand Tank Experiment
(University of Waterloo, 2014-09-08)Groundwater tables undergo natural fluctuations due to a variety of processes like snow melt, rain infiltration, aquifer recharge/discharge and river stage fluctuations. Water-table fluctuations result in the entrapment ... -
Effects of fluorine on the solubilities of Nb, Ta, Zr and Hf minerals in highly fluxed water-saturated haplogranitic melts
(University of Waterloo, 2012-11-01)The effect of fluorine on the solubilities of Mn-columbite (MnNb2O6), Mn-tantalite (MnTa2O6), zircon (ZrSiO4) and hafnon (HfSiO4) were determined in highly fluxed, water-saturated haplogranitic melts at 800 to 1000 °C and ... -
Emerging Contaminants: Artificial Sweetener Sample Preservation and Palladium Nanoparticle Transport in Porous Media
(University of Waterloo, 2017-04-25)Emerging contaminants are an increasing concern for regulatory bodies: artificial sweeteners and nanoparticles (NPs) included. Artificial sweeteners are found in domestic waste waters and can be used as tracers of anthropogenic ... -
Environmental sensitivities of coupled biogeochemical cycles in anoxic conditions: from soil batch experiments to a bioenergetics approach
(University of Waterloo, 2021-01-26)The ongoing displacement of climate zones has aggravated warming effects at regions from mid- to high-latitudes, affecting terrestrial organic carbon (C) stores. Amplified effects of warming occurring through the winter ...