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 20 of 115 for “"solution pH"”.
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Effects of Enhancement Solution pH on Fresh and Cooked Color of Dark-Cutting Beef
… to test the effects of citric acid-enhancement pH on visual and instrumental color of fresh and cooked steaks. Dark cutting and normal pH strip loin were injected to 111% of raw product weight with pH 3.5, 4.0, 4.5, or 5.0 solutions by mixing citric acid in either 0.05% phosphate solution or tap …
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Effect of Various Saturation Levels, Leaching Solution pH, and Leaching Cycle on Electrical Conductivity from Coal Mine Spoil Leachate
… the behavior of overburden with respect to TDS, pH, and trace metals. The objective of this study was to determine the effects of column saturation, leaching solution chemistry, and leaching cycle on the release of TDS and associated elements from an unweathered sandstone. Treatments evaluating …
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Sorption of pentachlorophenol to humic acids and subsequent effects on biodegradation and solvent extraction
… of the sorption and desorption of pentachlorophenol to soil organic matter. In order to separate the reactions controlling the interactions with the soil organic matter from those associated with mineral surfaces, these experiments used only humic acids extracted from soil samples. The major …
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Adsorption kinetics for the removal of soluble manganese by oxide- coated filter media
… capacity of oxide-coated media increases as solution pH increases. Further study revealed that uptake rate kinetics could be described by first order kinetics and also increased with increasing solution pH. The addition of free chlorine (HOCl) to solution greatly enhanced Mn²⁺ uptake rate …
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The reduction of bromate in drinking water by activated carbon
… carbon have been used to reduce bromate. Solution characteristics which influenced the reduction of bromate during this study include solution pH, initial bromate concentration, ionic strength of the solution, the presence of organic compounds, the dissolved oxygen content of the solution, …
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The influence of particle size on the chemistry of mica clays
… size on elemental composition, structure, morphology, and charge characteristics of 2:1 micas, mechanically produced clay separates were analyzed by; electron probe microanalysis (EPMA), transmission electron microscopy (TEM), thermogravimetry, specific surface area analysis, and ion exchange. …
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Remediation of acid mine drainage using natural zeolite
… of Fe, Cu, Zn and Mn from synthetic metal solutions and real AMD from Wheal Jane mine using natural zeolite. Laboratory experiments were performed to investigate the effectiveness of natural zeolite as a potential low cost material for the removal of these heavy metals from AMD. These …
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Improving the solubility and dissolution of poorly soluble drugs by salt formation and the consequent effect on mechanical properties
… may be improved by an enhanced solubility and dissolution rate. Four carboxylic acid drugs were selected, which were flurbiprofen, etodolac, ibuprofen and gemfibrozil. The drugs were chosen because they are weak acids with poor aqueous solubility and should readily form salts. The counterions used …
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Electrochemical self-assembly of copper/cuprous oxide layered nanostructures
… cuprous oxide are electrodeposited from alkaline solutions of Cu(II) lactate at room temperature. The electrode potential oscillates spontaneously during constant-current deposition. The potential oscillations are attributed to the formation and breakdown of a rectifying Cu₂O/solution interface. A …
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Hydrothermal Reaction of Crystalline Albite, Sodium Aluminosilicate Glass, and a Rhyolitic-Composition Glass With Aqueous Solutions: A Solid State Study
… glass of nearly albite composition with aqueous solutions of pH's from 1 to 11 at 250$\sp\circ$C and the mechanisms of these reactions using high-resolution solid-state multinuclear NMR spectroscopy in combination with SEM, XRD, IR spectroscopy, and electron microprobe analysis are investigated. …
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Effectiveness of Non-Chromate Inhibitors on Preventing Corrosion of Aluminum Alloys
… a radioactive labeling method. Chromate and phosphate adsorption data enhances the information gained from localized dissolution studies. The effectiveness of pertechnetate as a corrosion inhibitor for aluminum alloys has been investigated through radiometric adsorption studies. The effects …
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The effect of surface modification on the crystal growth of iron oxides
… were found to have a strong influence on morphology of FeOOH. Dicarboxylic acids, containing two and seven carbons, changed the characteristics of α-FeOOH. These changes included alteration of the isoelectic point of the particulates and changes in particle size and shape. EDTA was found to …
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Pit initiation on passivated metal surfaces: crystallographic orientation and environmental effects
… was found to be dependent on the crystallographic orientation of the surface in chloride solutions. For tin single crystals, the(111) face showed the lowest critical pitting potential among five differently oriented surfaces. The critical pitting potential of zinc single crystals decreased …
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The purification of industrial wastewater to remove heavy metals and investigation into the use of zeolite as a remediation tool
… Cu2+, Fe3+, Pb2+ and Zn2+ from synthetic metal solutions using natural zeolite. Laboratory experiments were used to investigate the efficiency of adsorbents in the uptake of heavy metals from industrial wastewater. These include equilibrium tests, kinetic studies and regeneration studies. The …
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Removal of antibiotics from contaminated waters using natural zeolite
… natural zeolite was investigated. The impact of pH and natural organic matter (NOM) on the sorption process was examined, and the maximum sorption capacity was calculated using the Langmuir-Freundlich sorption model. The results showed that at a neutral pH the maximum sorption capacity for the …
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Experimentally Derived Sticking Efficiencies of Microparticles using Atomic Force Microscopy: Toward a Better Understanding of Particle Transport
… through porous media. Sticking efficiency (alpha) is a major component of most particle transport theories. It is defined as the ratio of particles that adhere to a collector surface compared to the total number of particles that collide with that surface. In this study, the Interaction Force …
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Design of experimental setup for identification of parameters for optimal aerosolization of measles vaccine
… is well understood, studies have focused on pharmaceuticals and very little data is available regarding vaccines. The proposed study analyzes the relationships between various pre- and post-aerosolization parameters in order to calculate the "aerosol fingerprint," or combination of …
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Manganese oxide deposits in water treatment facilities, North East Scotland.
… within sand filtration beds. The oxides were amorphous with a stoichiometry close to MnO2, with very little variance in stoichiometry found within filter beds and between treatment facilities. The mass of manganese oxide deposited grew significantly over the course of this study, with growth …
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Acid resistance of sewer pipe concrete
A hydrochloric acid solution laboratory test was developed to assess the resistance of concrete used in the manufacture of pipes to sulphuric acid environments encountered in sewers. A hydrochloric acid solution (pH of 1,00) simulates the attack on concrete sewer pipes at the average daily sewage …
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Influences of supraoptimal root-zone temperature on the medium solution and growth of woody nursery crops
… plants and on the composition of the medium solution were studied. Medium temperature profiles were established for 3.8-liter black polyethylene containers exposed to solar radiation under Virginia nursery conditions. On clear days in mid-summer, maximum recorded medium temperatures on the …
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