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Showing 1 to 16 of 16 for “"Iron Hydroxide"”.
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Aqueous Silica in the Environment: Effects on Iron Hydroxide Surface Chemistry and Implications for Natural and Engineered Systems
… and exhibits a high affinity for the surfaces of iron oxides. Therefore, it is expected to play an important role in environmental systems. Experiments were conducted to investigate the fundamentals of silica sorption onto pre-formed ferric hydroxide at pH 5.0-9.5 and silica concentrations of …
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The Speciation of Dissolved Uranium in Marine Waters
… geochemical processes in the marine environment. Due to its low concentration, about 3.3 μg/1, some form of preconcentration is required for analysis. The two most widely used pre-concentration schemes are co-precipitation with iron hydroxide, and chelating ion exchange chromatography. …
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Effect of adsorption of non-protolyzable anions on goethite (alpha-FeOOH) mobility
… ON THE MOBILITY OF MANY INORGANIC IONS IN THE ENVIRONMENT. ANION ADSORPTION ON IRON HYDROXIDE USUALLY DECREASES THE PARTICLE MOBILITY AND MAKES THE PARTICLE SURFACE LESS POSITIVE. HOWEVER, FOR SOME NON-PROTOLYZABLE ANIONS LIKE FLUORIDE AND ARSENITE, THE ADSORPTION HAS ALMOST NO EFFECT ON SURFACE …
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Isolation of a Siderophore Produced by Methicillin-Resistant <em>Staphylococcus aureus</em> Strain H372.
<p>Iron is necessary for many cellular processes such as the electron transport chain and gene regulation. However, most iron on earth is found in insoluble iron-hydroxide complexes. In addition, iron is tightly sequestered in the human body by proteins such as transferrin, making it unavailable …
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Geophysical properties of carbon monoxide when used as an enhanced oil recovery agent
… of the fluids and rocks, and the reservoir environment (ie: temperature and pressure). Enhanced oil recovery (EOR) efforts attempt to manipulate these conditions to reach profitable production and prolong the economic viability of these known resources. Different approaches have been …
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Dose Determines if Soluble Copper is a Nutrient or an Antimicrobial for Legionella pneumophila in Premise Plumbing
… demonstrated that the presence of aluminum hydroxide from anode rods in water heaters can bind copper and render high doses non-toxic. On this basis it was also hypothesized that iron hydroxide would have similar effects and that lower levels of copper may act as a nutrient encouraging …
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The Influence of Water Quality on Arsenic Sorption and Treatment Process Performance
… microsand process such as residual turbidity, iron, post-treatment membrane filter run length, and TOC removal were also considered as part of this evaluation. Microsand ballasted coagulation provided promising results for many of the simulated groundwater test conditions in which more than 80% …
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Dynamics of soil processes under extreme meteorological boundary conditions - response of below-ground carbon, sulfur, and iron cycling in fen soils
… however, investigated changes in average environmental conditions in the long term, while the impact of extreme weather on peatland elemental cycles is still uncertain. Moreover, most studies do not provide a mechanistic understanding of the redox processes underlying the response of …
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Chemical and Biological Treatment of Acid Mine Drainage for the Removal of Heavy Metals and Acidity
… design of a process (patent pending) to remove iron from acid mine drainage (AMD) without the formation of metal hydroxide sludge. The system includes the oxidation of ferrous iron in a packed bed bioreactor, the precipitation of iron within a fluidized bed, the removal of manganese and heavy …
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An investigation into the effects of pulp chemistry under wet and dry grinding on the flotation response of pyrite
… mineral surface oxidation, deposition of iron hydroxides/oxides from grinding media and the attachment of inorganic ions on the surfaces of minerals. These factors are on the other hand affected by dissolved oxygen (DO), pH, ionic strength of process water and other pulp chemistry factors. …
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The Safety and Immunostimulatory Properties of Amorphous Silica Nanoparticles <10 nm in Diameter
… below 10 nm in size, while similarly sized iron hydroxide nanoparticles (3-5 nm) only induced low levels of CD69 expression on T helper cells. Finally, it was shown that nanosilica is capable of inducing T cell activation in whole blood, though the T cell responses were greatly attenuated. …
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Investigating the Influence of the Electrochemical Environment on the Flotation of a Mixed Sulphide Mineral System of Bornite and Chalcocite
… Other variables in the electrochemical environment such as the dissolved oxygen, (DO), pH, redox potential (Eh) and water composition are also essential in controlling flotation outcomes. The aim of this investigation is to determine the influence of the electrochemical environment on the …
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The reactivity of ferric (hydr)oxides towards dissolved sulphide
… an important role in redox reactions in many environments such as soils, marine sediments, lakes, and ground water. Under anoxic conditions, ferric (hydr)oxides are reduced by dissolved sulphide or by microorganisms. This reaction generates Fe(II) which may precipitate as iron hydroxide, adsorb …
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The Impact of Surface Modified Nanoparticles on the Performance of Polymer Solutions for Heavy Oil Recovery
… titanium oxide (TiO2) NPs, and in-situ prepared iron hydroxide (Fe(OH)3) NPs to polymer solutions of partially hydrolyzed polyacrylamide (HPAM) and xanthan gum (XG). In the second stage, the surface of the NPs were modified by chemical grafting with carboxylic acids, silanes, and polyacrylamide. …
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Examination of the forensic engineering techniques employed on fire-damaged concrete structures
… and 500°C were mainly due to the oxidation of iron hydroxide and the dehydroxylation of portlandite. Further chemical changes at 650°C and above were identified as a direct result of the decarbonation of CaCO3. At elevated temperatures, the absence of certain minerals within the concrete …
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TIMELESS QUESTIONS AND MODERN CHALLENGES: A JOURNEY FROM THE ORIGIN OF LIFE IN HYDROTHERMAL VENTS TO ELECTROCHEMICAL CO2 REDUCTION
… minerals composing the vent structure, mainly iron (-nickel) sulphides and oxyhydroxide, separate two environments with opposite characteristics: on the ocean side an acidic environment containing CO2 and on the hydrothermal fluid side an alkaline environment containing H2. Across this mineral …