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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 43 for “"River sediments"”.
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Heavy metals in river sediments
… of sediment material were collected from the River Cynon. The concentrations of heavy metals in the samples were determined by Atomic Absorption Spectroscopy after digestion of the dried sample. A rapid hydrochloric acid/hydrogen peroxide digestion was chosen after a brief comparison with the …
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Lower Kuiseb River sediments and their control on dust emission
… using remote sensing, have identified the Kuiseb River in Namibia as the dustiest river in Southern Africa. Dust plumes detected from this basin are mostly associated with the Lower Kuiseb River, between the end of the bedrock canyon at Natab and the Kuiseb Delta towards the Atlantic Ocean. The …
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Investigation of the Volga River sediments composition : inorganic pollutants of potential concern
… group of Prof. H.F. Schöler) of the Volga rivers aquatic sediments were carried out. Starting with the work of Züllig (1956) sediments have been recognized and used extensively as an almost ideal compartment for the description of the current condition of an aquatic system. Acting as a …
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Anaerobic Microbial Dechlorination of Polychlorinated Dibenzo-p-dioxins and Dibenzofurans in Contaminated Kymijoki River Sediments
… (PCDD/Fs) accumulate in the environment in sediments and soils. PCDD/Fs may pose considerable environmental and health risks because of their persistence in the environment. PCDD/Fs can be degraded slowly by microbial reductive dechlorination under anaerobic conditions which produces less …
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Sorption of a branched nonylphenol isomer and perfluorooctanoic acid on geosorbents and carbon nanotubes
… in the environment. Their sorption on soils and sediments is of importance for their fate and transport in the environment. Especially in China, there is still a lack of consolidated knowledge on the sorption behavior of NP and PFOA on geosorbents such as Yangtze River sediments. Thus, the …
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Investigating the ecological controls on methane production in a riparian cottonwood forest and adjacent river
… processes of methane production in the Oldman River sediment and adjacent riparian cottonwood tree stems in southern Alberta. Carbon (C) and nitrogen (N) content in tree stems and river sediment environments were measured, while molecular genetic techniques and stable carbon isotope …
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ΜΕΛΕΤΗ ΚΑΤΑΝΟΜΗΣ ΚΑΙ ΕΠΑΝΑΔΙΑΛΥΣΗΣ ΒΑΡΕΩΝ ΜΕΤΑΛΛΩΝ ΣΕ ΝΕΡΑ ΚΑΙ ΙΖΗΜΑΤΑ ΠΟΤΑΜΩΝ ΤΗΣ ΒΟΡΕΙΑΣ ΕΛΛΑΔΑΣ
… IN DIFFERENT WATER AND SEDIMENT PHASER IN RIVERS AXIOS AND ALIAKMON IN NORTHERN GREECE. A FIVE STEP SEQUENTIAL EXTRACTION PROCEDURE WAS FOLLOWED IN ORDER TO STUDY THE PARTITIONING OF HEAVY METALS IN CATION-EXCHANGE SITES, CARBONATES FE-MN OXIDES, ORGANIC MATTER-SULPHIDER AND CRYSTAL …
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A study of the geochemical behaviour of anthropogenic platinum-group elements in a mixed urban-rural catchment: the River Stour, Kent, U.K.
A baseline survey of contemporary fluvial sediments in the Kentish Stour, east Kent, England, has been undertaken to document the sources and distribution patterns of anthropogenic PGE in an attempt to constrain some of the physical and chemical parameters that may influence the distribution of …
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Mineralogy, Chemistry & Flux of Suspended Sediments in Himalayan Rivers
The flux and composition of river suspended sediments contain valuable information on processes including erosion rates, the composition of the eroded bed rocks, chemical weathering and sediment storage and sorting within river channels. In this thesis, samples from the Kosi River in Nepal (a major …
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Characterizing methanogen and methanotroph diversity, abundance and activity within the Hampshire-Avon catchment
… in the Hampshire-Avon catchment, UK. Soil and river sediments were taken from sites across different underlying geologies based on their baseflow index (BFI); from low (chalk) to medium (greensand) to high BFI (clay). In general, methane oxidation potentials (MOP) and methane production …
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Sediment chemistry as an archive of provenance and weathering in the Mekong River Basin
… sites for understanding weathering processes. Rivers, as a carrier of eroded and weathered materials, provide a primary archive for the study of silicate weathering. This study focuses on one of the largest rivers draining from the Himalayan-Tibetan-Plateau region, the Mekong River. A major new …
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Effects of Capping on Biodegradation of Organic Contaminants in Sediments
… effective remediation technique for contaminated sediments due to its capability to contain contaminants and provide a sound habitat for indigenous biota. This research investigated the effect of capping on biodegradation of organic contaminants in Anacostia River sediments using both experimental …
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The effect of salinity on nutrient release from riverine and tributary estuarine sediments to the Chesapeake Bay under oxidizing and reducing conditions
… objective, bench-scale microcosm studies of York River sediments and Occoquan Reservoir sediments were conducted. Seawater and freshwater were mixed in various ratios to simulate seasonal, salinity-varying environments in the Chesapeake Bay and its tributary estuaries. Experiments were conducted …
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Investigations on the Phenomena of Accumulation and Mobilization of Heavy Metals and Arsenic at the Sediment-Water Interface by Electrochemically Initiated Processes
… and municipal effluents are discharged. Aquatic sediments/environments are often polluted by heavy metals due to the temporal variations in anthropogenic input of contaminants via atmospheric deposition, catchment runoff, effluent inflow and dumping from industrial transportation, mining, …
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A comparative study of sediment characteristics of Sand River and Nzhelele River in Limpopo Province, South Africa
… mode of transit, and deposition of detrital sediments, grain size analysis is a dynamic sedimentological tool. Fluvial scientists are particularly interested in understanding the relationships between river systems that have been subjected to a variety of forcing factors, such as climate, …
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The upper Red River Formation (Ordovician) in western North Dakota
<p>The upper Red River Formation in Western North Dakota consists of cyclic sedimentary rocks having four main porosity zones which contain most of the oil and gas found in the formation. It was divided into three distinct units that were traced throughout western North Dakota on mechanical logs. …
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Polyethylene devices and the effects of sediment resuspension on the cycling of PAHs and PCBs in the lower Hudson Estuary
… aromatic hydrocarbon (PAH), from native Hudson River sediments was measured, and 3) pyrene and 2,2',5,5'-tetrachlorobiphenyl (PCB #52), a polychlorinated biphenyl (PCB), concentrations were measured in the lower Hudson Estuary so that the input of these chemicals as a result of sediment …
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Fort Union (Paleocene) mollusks from southern Golden Valley and southeastern Billings counties, North Dakota
… molluscan species are known to occur in Tongue River Sentinel Butte sediments of parts of Billings, Golden Valley, and Slope Counties in southwestern North Dakota. Tongue River sediments contain all nine of the species which include: two unionids, Plesielliptio priscus (Meek and Hayden) and …
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Exploring subsurface ground water and geochemical rock interactions during drainage of a surface water reservoir in Switzerland
… chromatographs) found within surface soils, river sediments and the lake, to those found in groundwater samples from the GTS. Results show that organic signatures are well-preserved and that different groundwater samples can be traced to different surface infiltration sites. This organic …
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