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 11 of 11 for “"Clay fractions"”.
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Soil Organic Carbon Sequestration Potential by Perennial Biomass Crops in Southern Ontario, Canada
… μm), microaggregates (250-53 μm) and silt plus clay fractions (<53 μm). Higher SOC and STN concentrations were found in macroaggregates and silt plus clay fractions than in microaggregates. WLs had the highest SOC and STN concentrations in macroaggregates, followed by Mis, Ag and SG fields. STN …
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Soil washing and post-wash biological treatment of petroleum hydrocarbon contaminated soils
… biological treatment of the different soil fractions. In addition to soils obtained from contaminated sites, studies were also performed on soils contaminated in the laboratory. Soil washing was performed using a bench-scale soil washing system. Washing was carried out with simultaneous …
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GEOCHEMICAL ANALYSIS OF THE EAGLE FORD SHALE IN WEBB AND DIMMIT COUNTIES, TX
… Eagle Ford characterized by elevated Al-rich clay fractions, reduced carbonate content, and finer-grained detritus relative to the Upper Eagle Ford. Grain-size–sensitive ratios (Zr/Nb, Si/Al) and carbonate proxies (Ca, Sr) document changes in shoreline proximity, subtle sea-level oscillations, …
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Glacial stratigraphy of southeastern North Dakota
… using the percentage of the sand, silt, and clay fractions of the till and using the proportion of igneous and metamorphic rock fragments, limestone and dolomite fragments, and shale fragments in the very-coarse-sand fraction (1 to 2 mm) of the till. The proportions of sand and shale are the …
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A comparison of soil characteristics in relation to success of a restored prairie
… 2C because it also had light soil color, higher clay content, and lower silt content compared to the other three permanent plots. This study attempts to determine the soil characteristics at Howell Prairie and how those relate to prairie success by using a stratified sampling regime. Forty-six …
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Phosphorus Losses in Runoff from Virginia Soils
… study. Phosphorus retention among separated clay fractions and whole soils were related to Al bearing minerals such as hydroxy-interlayered vermiculite (HIV), gibbsite, and amorphous Al. Samples dominated by kaolinite retained very little P. Application of these results to runoff data showed …
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Paleo-environmental conditions and tectonic settings of cretaceous-tertiary kaolins in the Eastern Dahomey and Niger Delta Basins in Nigeria.
… respectively. The kaolins predominantly have clay to sandy clay textures with plasticity indices between 10 and 22 wt %. Bulk mineralogical quantitative results indicated that the Cretaceous kaolins have kaolinite, quartz, and muscovite present in that decreasing order with anatase, goethite, …
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Pedogenesis and geomorphic implications of soils developed on Blue Ridge alluvial fans, Virginia
… are found in the 2Bt horizons (unit B) where clay approaches 60 percent at 2m. Up to 25 pedons were sampled within a 50 m² grid at four Sites. Paired samples from the pedons were analyzed by principal component analysis (PCA). The PCA loadings show Significant soil properties contribute about …
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Einfluss von Mikroorganismen und Organo-Ton-Komplexe auf die Bildung von nicht-extrahierbaren Rückständen im Boden unter Verwendung von 14 C-Nonylphenol und 14 C-MCPA als Modellsubstanzen
… measure the effect of microorganisms and organo-clay complexes on the formation of non-extractable residues (NER) of soil. For the purpose of these investigations two test chemicals, 4(3’,5’-dimethyl-3’-heptyl)-phenol (p353-NP) and 2-methyl-4-chlorophenoxyacetic acid (MCPA), were used. To …
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Causes and Mechanisms of Remagnetisation in Palaeozoic Sedimentary Rocks - a Multidisciplinary Approach
… palaeomagnetic and rock magnetic methods with clay mineralogy, isotope geochemistry of clay minerals and trace element geochemistry of Fe-oxide leachates to study remagnetised sedimentary rocks from Palaeozoic outcrops in Middle and Eastern Europe. Three areas were selected (NE Rhenish Massif, …