Browsing Earth and Environmental Sciences by Title
Now showing items 12-31 of 434
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Aqueous speciation of selenium during its uptake by green algae Chlamydomonas reinhardtii
(University of Waterloo, 2013-05-03)Selenium (Se) is a micronutrient, yet elevated Se can be toxic to aquatic organisms. The range of Se concentrations within which Se uptake goes from insufficient to toxic is very narrow. It is thus important to understand ... -
Aqueous Stability and Transport of Catalytic Nanoparticles for Groundwater Remediation
(University of Waterloo, 2015-05-14)Nanoparticles (NP) are increasingly being used for in situ groundwater remediation because of their catalytic properties and the potential to inject them directly into the subsurface. Here, the aqueous stability and ... -
Assessing hydrological processes controlling the water balance of lakes in the Peace-Athabasca Delta, Alberta, Canada using water isotope tracers
(University of Waterloo, 2007-05-22)One of the world’s largest freshwater deltas (~4000 km2), the Peace-Athabasca Delta (PAD), is located at the convergence of the Peace and Athabasca rivers and Lake Athabasca in northern Alberta, Canada. Since the early ... -
Assessing Microbial Viability and Biodegradation Capabilities in Sandstone
(University of Waterloo, 2017-11-17)Environmental practitioners have demonstrated enhanced in situ bioremediation (EISB) in homogeneous unconsolidated soils to remediate chlorinated solvents. However, EISB has not been fully investigated in bedrock environments. ... -
Assessing Sensitivity of Subsurface Mine-Dewatering Activities to Climate Change
(University of Waterloo, 2023-09-01)Underground mining activities require constant removal of groundwater from their void spaces to maintain dry and safely accessible excavations for ore extraction in a process known as dewatering. The nature and degree ... -
Assessing Stratigraphic Controls on the Secondary Detrital Footprint from Buried Mineralization and Alteration at the Highland Valley Copper Mine, British Columbia
(University of Waterloo, 2020-01-24)Mineral exploration is progressively shifting to deeper targets, including those buried under thick unconsolidated sediments. It is thus becoming increasingly important to understand the sedimentary successions of the ... -
Assessment of Nitrate Export in Agricultural Sub-Catchments of the Grand River Watershed: An Isotope Approach
(University of Waterloo, 2015-02-20)Nitrate (NO3-) is one of the most widespread contaminants in freshwater systems globally. This is largely due to high fertilizer application rates that are required to maximize crop yield. Elevated NO3- concentrations can ... -
Assessment of saltwater origin in the Rub’ al-Khali basin and its relation to the formation of sabkha Matti
(University of Waterloo, 2021-01-15)The Rub’ al Khali sand sea is the largest uninterrupted sand desert on Earth that occupies an area of approximately 650,000 km2 of the Arabian Peninsula. Yet, the desert basin is underlying by one of the largest multi-level ... -
Atmospheric acidification of mineral aerosols: a source of bioavailable phosphorus for the oceans
(European Geosciences Union, 2011-07-01)Primary productivity of continental and marine ecosystems is often limited or co-limited by phosphorus. Deposition of atmospheric aerosols provides the major external source of phosphorus to marine surface waters. However, ... -
Automatic estimation of aquifer parameters using long-term water supply pumping and injection records
(Springer, 2016-09-01)Analyses are presented of long-term hydrographs perturbed by variable pumping/injection events in a confined aquifer at a municipal water-supply well field in the Region of Waterloo, Ontario (Canada). Such records are ... -
Behaviour and Treatment of Nitroaromatics in Groundwater
(University of Waterloo, 2007-09-25)The purpose of this study was to determine the chemical and/or biological factors that cause 2,4-dinitrotoluene (2,4-DNT), 2,6-dinitrotoluene (2,6-DNT) and nitrobenzene (NB) to transform to their respective aromatic amines ... -
Behaviour of apatite during partial melting of metapelites and consequences for prograde suprasolidus monazite growth
(Elsevier, 2017-03-01)The suprasolidus behaviour of apatite and monazite is examined for an average metapelite composition using phase equilibria modelling coupled with solubility equations of these minerals. Both closed- and open-system scenarios ... -
Behaviour of Mesoporous Silica (MCM-41) Supported Catalysts in Degradation Reactions
(University of Waterloo, 2013-01-08)A research project was carried out to investigate several aspects of Mobil’s composition of matter #41 (MCM-41) pertaining to its potential application in water treatment technologies. The goal of the work was to lead to ... -
Behaviour of Oxygenates and Aromatic Hydrocarbons in Groundwater from Gasoline Residuals
(University of Waterloo, 2007-01-23)ABSTRACT This study focuses on the dissolution and near-source attenuation of oxygenated gasoline hydrocarbons in groundwater from two gasoline residual sources: one containing gasoline with 9.8% methyl tert butyl alcohol ... -
Behaviour of Pharmaceutically Active Compounds in contact with Reactive Media in Simulated Ground Water
(University of Waterloo, 2008-09-03)Water treatment approaches for pharmaceutically active compounds (PhACs) are restricted by the chemically-variable nature of the PhACs themselves, each successful in treating only a small number; or the adaptability or ... -
Bench Scale Performance of Partitioning Electron Donors for TCE DNAPL Bioremediation
(University of Waterloo, 2008-05-08)Prior to the implementation of an enhanced bioremediation pilot study for a trichloroethene (TCE) source area at an industrial site in the United Kingdom (the Site), laboratory microcosm and column studies were performed. ... -
Bioenergetics of mixotrophic metabolisms: A theoretical analysis
(University of Waterloo, 2019-08-29)Many biogeochemical reactions controlling surface water and groundwater quality, as well as greenhouse gas emissions and carbon turnover rates, are catalyzed by microorganisms. Representing the thermodynamic (or bioenergetic) ... -
Biogeochemical cycling of nutrient silicon in a human-impacted large lake nearshore environment (Hamilton Harbour Area of Concern, Lake Ontario, Canada)
(University of Waterloo, 2017-12-14)The biogeochemical cycling of nutrient silicon (Si) through rivers, wetlands, lakes, and artificial reservoirs regulates the magnitude and bioavailability of Si delivered downstream and to the ocean (Frings et al. 2014; ... -
Bioretention cells under cold climate conditions: Effects of freezing and thawing on water infiltration, soil structure, and nutrient removal
(Elsevier, 2019-02-01)Bioretention cells are a popular control strategy for stormwater volume and quality, but their efficiency for water infiltration and nutrient removal under cold climate conditions has been poorly studied. In this work, ... -
Building and characterizing low sulfide instrumented waste rock piles: Pile design and construction, particle size and sulfur characterization, and initial geochemical response
(University of Waterloo, 2009-08-31)A rigorous laboratory and field study to measure and compare low sulfide waste rock and drainage characteristics at various scales has been designed and implemented. The field study was constructed at the Diavik diamond ...