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.
Results
Showing 1 to 20 of 27 for “"Exchangeable cations"”.
-
Long-Term Effects of Rock Type, Weathering and Amendments on Southwest Virginia Mine Soils
… over time and adversely affected extractable P. Exchangeable cations and total N increased in all treatments. Annual C-sequestration rates were 0.51 Mg ha⁻¹ for 1:1 SS:SiS and 0.32 Mg ha⁻¹ for SiS. In the SA experiment, extractable P and exchangeable cations increased over time in organically …
-
Implementation of Sustainable Management Practices at Two California Central Coast Vineyards and Their Effects on Soil Fertility
… The range of soil values (soil pH, P, K, exchangeable Ca, Mg, and K, OM, Ca/Mg and C/N ratios) was either completely separate or different between Vineyard One and Two. There was almost no significant difference found between treatments and their effects on soil nutrients, exchangeable …
-
A study of the gelation of air-setting refractory mortars
… to the gelation than did one without so many exchangeable cations. The flame photometer was employed to analyze the concentration of the alkaline ions in the effluents obtained during the electrodialysis of a clay and the results indicated that the peaks in the time-current curve of the …
-
Sorption mechanisms of dibenzo-p-dioxin/furan from water by smectite clays and theoretical studies on formation pathways of chlorodibenzo-p-dioxins from precursor chlorophenols on smectite clays
… /furan from water. Adsorption was promoted by exchangeable cations with low hydration energies, and negative charge in the smectite arising from the tetrahedral siloxane sheets. X-ray diffraction measurements revealed that as dibenzo-p-dioxin (DD) loading increased to ≥ 8,000 mg/kg the clay …
-
The available nutrients in selected deer browse species growing on different soils
… and second highest in values for total exchangeable cations and organic matter. The Clinton study area values were second highest in pH, phosphorous, and base saturation, and was highest in organic matter and manganese content. The chert values were the next lowest for phosphorus and …
-
An Investigation Of The Soils Within And Beneath The Middens Of Two Huron Villages
… from beneath the middens were enriched with exchangeable cations. In addition, alkaline constituents were sufficiently mobilized to alter pH values. The study ends with a number of archaeological considerations and some recommendations for future research.
-
Permeability and swell testing of selected South African bentonites
… particle are held together by weak forces and exchangeable cations (which dictate the bentonite type). When brought into contact with water, the water is drawn onto the sheets to balance the charges forcing the layers apart resulting in swelling of up to 15 times the original particle …
-
Remediation of acid mine drainage using natural zeolite
… The amount of exchangeable cations increased at equilibrium, indicating that ion exchange had taken place. Higher metal uptakes were achieved by increasing agitation speed, initial solution pH, particle size reduction, and thermal pre-treatment. The rate limiting …
-
Phosphorus adsorption by selected clay minerals
… to show the theoretical effect of certain cations on the adsorption of phosphorus by clay minerals. The various diffuse double layer and Donnan equilibrium theories were used in this theoretical treatment. Three standard clay minerals, a kaolinite, an illite and a montmorillonite were used …
-
Characterization Of Arctic Soils: Interrelationships With Site And Vegetation
… bulk density, moisture content, pH and exchangeable cations, the iron, aluminum and manganese extracted by dithionite, oxalate and pyrophosphate solutions, and various organic fractions were determined for each of 149 soil samples.;Characterization of the variations in these data was …
-
Thermo-analytical and spectroscopic characterisation of pore lining minerals in reservoir rocks.
… in the interlayer space and are associated with exchangeable cations via their carbonyl groups. Two layers of DMF and NMF are present in the interlayers at low temperatures which reduces to one upon heating to 50-170°C. NMF is found to be present in hydrogen-bonded clusters.
-
Ecological and Genetic Status of the Purple Pitcher Plant, <i>Sarracenia purpurea</i> L., in Maryland and Virginia
… or polluted sites exhibited elevated levels of exchangeable cations magnesium, calcium, and sodium. Climatic data disclosed that southern Virginia purple pitcher plant sites are both warmer and wetter than those in Maryland. Maryland pitcher plant bogs had greater species richness than Virginia …
-
The synthesis and ion-exchange chemistry of vanadium doped natisite and paranatisite
… of paranatisite is less regimented, with exchangeable cations fragmented throughout the framework.
-
Virgin hardwood forest soils of western North Carolina
… whole soil clay, organic matter, and A horizon exchangeable cations than south-facing soils. Cation exchange capacity in these soils is almost totally dependent on organic matter content, and the mineral fraction is relatively inert. All soils were in the oxidic mineralogy class. Bibbsite was …
-
Long-term changes in forest soils of Maine and Illinois
… is divided into two parts based on field site locations and experimental designs from previous studies: 1) a study utilizing buried soil-bags at Howland, Maine, and 2) a resampling of soils at Robert Allerton Park, Monticello, Illinois. A study of organic matter quantity and quality in 1992 was …
-
The Lasting Effects of Prescribed Fire and Harvesting on Forest Floor and Soil Nutrients in the Eastern Sierra Nevada Mountains
… (total N, P, K, Ca, Mg; mineral N, ortho-P, exchangeable cations, cation exchange capacity, iron, manganese, copper, zinc, and δ15N (N. Tahoe only)). Resin lysimeters were installed at the Truckee site and resin capsules and Plant Root Simulator (PRS) probes were installed at the North Lake …
-
Hydrolysis of aluminum in synthetic cation exchange resins and dioctahedral vermiculite
… that hydrolyzed forms of aluminum were exchangeable. Purified dioctahedral vermiculite from a Nason soil was expanded using successive treatments of N BaCl₂, reducing the potassium level In the sample to 0.05 percent. Tota] analysis yielded the average formula …
-
The effect of biochar on immobilization and phytoavailability of chromium, nickel and lead in soils amended with slag
… greenhouse. The soils were analyzed for texture, exchangeable cations (Mg2+, Ca2+, K+), pH, electrical conductivity and soil aggregates. Slag was analyzed for potassium, phosphorus, pH, electrical conductivity, total nitrogen, chromium, nickel and lead, and biochar was analyzed for organic carbon …
-
Mineralogy and geochemistry of kaolins in oxidic soils developed from different parent rocks in Limpopo Province, South Africa
… composition of soil kaolin has significant implications on soil fertility, geochemical exploration and engineering properties. Despite the dominance of kaolin in these soils, little is known of their properties in the medium. The nature of kaolin minerals in soils varies with parent material, …
Page 1 of 2