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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 “"major ions"”.
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The Effects of Urban Land Use Type on Low Order Stream Geochemistry, Columbus, Ohio
… primarily examined the bulk chemical contributions to high order rivers and streams, while not focusing so strongly on the tributaries that control their chemistry. Small scale analysis of solute concentrations in urban tributaries is necessary to understand the influence of urban land use …
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MAJOR AND MINOR ION GEOCHEMISTRY OF GROUNDWATERS FROM BERMUDA
… marshes were sampled and studied for variations in major and minor ion geochemistry. Factors which influence groundwater geochemistry include Ghyben-Herzberg/freshwater-seawater mixing, carbonate dissolution and recrystallization, redox and the hydrology. The major ions calcium, magnesium …
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Theoretical studies of the mid-latitude ionosphere
… ionosphere in Chapter I we describe how the equations of continuity and momentum for 0+, H+, He+, 0++ are derived from the formulations of St-Maurice and Schunk(1977) and Quegan et al.(1981) in Chapter II. In Chapter III we investigate the nature of the downward flow of protons in a collapsing …
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Hydrochemical dynamics on sub-Antarctic Marion Island
… environments are some of the most sensitive regions to climate change, investigations into isotopic and hydrochemical dynamics on sub-Antarctic islands are limited. To address this, the Soft Plume River on sub-Antarctic Marion Island was sampled daily along an altitudinal gradient during an …
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Stream water and soil water chemistry after the Table Mountain wildfire, Washington, USA
Analyses of major and trace elements, major ions, and nutrient concentrations were made to investigate how stream water and soil water chemistry changed over 16 months following the Table Mountain wildfire. Sites with different burn severity were also compared. The fire occurred in 2012 in Kittitas …
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Water Quality Changes Under Ice Cover in Northern Prairie Lakes
… layers of the ice. No substantial concentrations of any ions were found in the ice of lower layers. Specific conductance increased over 40% under ice cover in two of the lakes studied. Increases in other lakes ranged from 19 to 38%. Major ions showed increases similar to specific conductance …
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Groundwater geochemical characteristics and its suitability for drinking and irrigation in Ventersdrop, North West Province, South Africa
Groundwater is major source of freshwater in regions devoid of surface water resources. The dependence on groundwater is increasing worldwide. South Africa is no exception. Groundwater resource has been identified as the main and reliable water resource for human consumption and agricultural …
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NATURALLY ACIDIC OR ANTHROPOGENICALLY ACIDIFIED? UNCOVERING THE DRIVERS OF STREAM ACIDITY DURING STORMFLOW IN THE NEE SOON CATCHMENT, SINGAPORE
… streams were selected in the NSC. The pH and major ions in precipitation, throughfall and shallow groundwater and streamwater samples were analysed. Soil cores were collected for analysis of pH, particle size distribution, organic matter content, effective cation exchange capacity (ECEC) and …
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Evaluation of the Effects of Mining Related Contaminants on Freshwater Mussels (Bivalvia: Unionidae) in the Powell River of Virginia and Tennessee
… of 29 extant species. Throughout the river major ion and trace element concentrations have increased over the last several decades due to extensive surface coal-mining in the headwaters in Virginia. As watershed area affected by mining has increased, mussel populations have declined, …
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Geochemistry of a pristine fynbos ecosystem in the Harold Porter National Botanical Gardens and Kogelberg Biosphere Reserve
… Reserve in order to investigate interactions between the various nutrient pools in a pristine fynbos ecosystem. Physical variables (pH, EC, temperature, DO, alkalinity) were measured in the field, and water samples were collected and analysed for chemical composition. Chemical composition …
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Toward improved assessment of freshwater salinization as a benthic macroinvertebrate stressor
… ecosystem services, and human health. In many regions of the world, and in coal-mining-influenced streams of the temperate forests of Appalachia USA, specific conductance (SC), a surrogate measure for the dissolved major ions composing salinity, has been linked to decreased diversity of benthic …
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Effects of land-use change on benthic macroinvertebrates in the upper reaches of the Apies-Pienaar catchment
Urbanisation of catchment areas is a major cause of freshwater ecosystem degradation worldwide. As catchments become more developed and river ecosystems become increasingly engulfed in various land use activities, there is a growing need to understand these impacts on freshwater ecosystems. Benthic …
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A Geochemical Assessment of Potential Groundwater Storage Locations within the Yakima River Basin
… the recharged water. In this project we analyzed major ions and stable isotopes of surface waters and groundwaters within three regions (Roslyn, Kittitas Valley and Moxee Valley) to determine water–rock interactions, relative residence times, recharge regimes and groundwater surface-water …
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Comparison of Quantitative and Semi-Quantitative Assessments of Benthic Macroinvertebrate Community Response to Elevated Salinity in central Appalachian Coalfield Streams
… In freshwater environments, elevated levels of major ions, measured as total dissolved solids (TDS) or specific conductance (SC), can cause adverse effects on aquatic ecosystem structure and function. In central Appalachia, eastern USA, studies largely rely on Rapid Bioassessment Protocols with …
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Assessment of coastal aquifer contamination using geochemical and health risk assessment in Maputaland formations, South Africa
… wells during 2018 and 2019 and were analysed for major ions, minor ions, nutrients and trace metals. Na-Cl water type was dominant in groundwater followed by Ca-HCO3. Cross plots revealed that ion exchange, reverseion exchange, silicate weathering, seawater mixing, and anthropogenic inputs from …
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Restoration of lowland raised bogs damaged by peat extraction - with particular emphasis on Sphagnum regeneration.
… vegetation to some areas. 3. Hydrochemical conditions of cut-over sites may differ significantly from undisturbed bogs with implications for Sphagnum growth. Water samples from a peat field at Thorne Moors were comparatively acidic and contained comparatively high concentrations of most major ions …
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Ground water - surface water interactions in the lower Virgin River area, Arizona and Nevada
This study assessed interactions between ground water and surface water in the lower Virgin River, Arizona and Nevada, using stable isotopes and major ions as environmental tracers. The study reach starts at the Virgin River Gorge in Arizona and terminates at Lake Mead in Nevada, 80 km downstream. …
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Water and electrolyte content and distribution in tissues of thermally-acclimated rainbow trout, Salmo gairdneri
… gairdneri. To this end levels of water and the major ions, sodium, chloride and potassium were evaluated in the plasma, at three skeletal muscle sites, and in cardiac muscle, liver, spleen, gut and brain of animals acclimated to 2°, 10° and 18°C. The occurrence of possible seasonal variations in …
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Desalination of brackish groundwater in the United States : minimum energy requirements
… to meet fresh water demand. Various organizations in the United States have collected more hydrological and chemical data from the growing number of wells. Yet, only one national assessment of groundwater resource distribution and availability has been conducted in the United States since the …
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Hydrogeologic Controls on Groundwater Quality in the West Mamprusi Area, Northern Ghana
… groundwater samples were analyzed for major ions and trace elements, and 25 samples were analyzed for carbon isotopes. Graphical and statistical analyses, including Piper and Stiff diagrams, are used to categorize the water chemistry, resulting in a variety of groundwater types: …
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