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Showing 1 to 20 of 325 for “"Ferric"”.
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The ferric leaching of pyrite
… been found to occur via an indirect mechanism. Ferric iron leaches the pyrite, and is reduced to ferrous iron. Bacteria such as Thiobacillus ferrooxidans oxidise the ferrous iron to ferric iron, thus maintaining a high redox potential. In this thesis, the effect of the redox potential on the …
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Ferric chloride from crude copperas
… Crude copperas can be used to make a solution of ferric chloride by reacting it with calcium chloride, filtering off the precipitate of calcium sulfate, and oxidizing the ferrous iron to ferric iron with chlorine gas. The calcium content of the ferric chloride solution is low enough so that the …
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Crystal chemistry of ferric-rich fayalites
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1983.
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Polyelectrolyte conditioning of ferric sulfate sludge
Tests were run on samples of ferric sulfate sludge collected from the sedimentation basins of a water treatment plant during basin cleaning operations. The purpose of the testing was to determine if cationic, anionic and nonionic polyelectrolytes could successfully condition the sludge to improve …
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Ferric/ferrous determinations in synthetic biotite
The relationships between ferric iron content and the P-T-fH₂ conditions of formation were examined for two biotite compositions: annite (K₂Fe₅Al₄Si₅O₂₀(OH)₄) and siderophyllite (K₂Fe₆Al₂Si₆O₂₀(OH)₄). The synthesized phases were annealed at fixed hydrogen fugacities using both the solid oxygen …
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Inflammatory Bowel Disease and Anemia : Treatment with Ferric Carboxymaltose
Anemia on tulehduksellisten suolistosairauksien yleisin ekstraintestinaalinen komplikaatio, jonka hoidossa perinteinen peroraalinen rautahoito ei välttämättä riitä. Ensinnäkin peroraalisen raudan hoitovaste on usein heikompi tulehduksellista suolistosairautta sairastavilla potilailla, mikä johtuu …
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The reactivity of ferric (hydr)oxides towards dissolved sulphide
Ferric (hydr)oxides are ubiquitous with different characteristics such as stability, reactivity and surface properties and play 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 …
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Structural Studies on Ferric Uptake Regulator Proteins from Mycobacterium tuberculosis
… tuberculosis increases. In M. tuberculosis the ferric uptake regulator A (FurA) is activated by Fe2+ to bind specifically to its target DNA sequence thereby repressing the downstream genes. Zinc is also an important element for all living organisms and serves as a cofactor in all six classes of …
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A Study of the Ferrous-Ferric System in Phosphoric Acid
… the oxidation-reduction potential of the ferrous-ferric system by using methods of procedure and apparatus that are easily reproducible under laboratory conditions. |In the media of various concentrations of orthophosphoric acid, the potential of the ferrous-ferric system is depressed far below …
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Adsorption of trace metals by hydrous ferric oxide in seawater.
Thesis. 1978. Ph.D. cn--Massachusetts Institute of Technology. Dept. of Chemistry.
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The Formal Oxidation-Reduction Potentials of Ferric-ferrous in Phosphoric Acid
The formal redox potentials of the ferric-ferrous system have been determined in the media of perchloric (15), nitric (12), hydrochloric (13), sulfuric (15), and phosphoric (l) acids. The acids are named in the order of increasing extent to which the oxidation potential of the ferric-ferrous system …
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Novel Discoveries About the Spin-Crossover Transition in Schiff-Base Ferric Complexes
… conversion has been studied in pseudo-octahedral ferric complexes {Fe('III) (X-SalEen)(,2)}Y. The ligand, X-SalEen, is obtained by the Schiff-base condensation of salicylaldehyde, 3-OCH(,3)-salicylaldehyde, or 5-OCH(,3)-salicylaldehyde with N-ethylethylenediamine. The anion, Y, used is NO(,3)('-), …
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Mechanisms Causing Ferric Staining in the Secondary Water System of Brigham City, Utah
… on contact surfaces as the aforementioned ferric stain. This research focuses specifically on the iron chemistry involved and evaluates this hypothesis using various measurements and models including field data collection, computer simulations, and bench-scale testing to validate the …
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Spectroscopic Studies of the Reduction of Nitrate and Ferric Iron in Heterogeneous Systems
Made available in DSpace on 2014-12-14T14:37:27Z (GMT). No. of bitstreams: 1 7913374.pdf: 4152412 bytes, checksum: 7056c857f39947c51273650ed323ef07 (MD5) Previous issue date: 1978
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Effect of Calcium on Arsenic Release From Ferric and Alum Sludges and Lagoons
… that has been removed from water by sorption to ferric or aluminum hydroxides can accumulate in residuals to concentrations many times higher than in the source water. The first part of this study evaluates the effectiveness of lime conditioning as a method for immobilizing this arsenic. As the …
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The rates of oxidation of galena and sphalerite in acidic ferric chloride solutions
… cubic, monosulfides their reaction rate with ferric iron differs by about 2.5 orders of magnitude for m<sub>Fe³⁺</sub> = 10⁻³.
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The Effect of Pressure on The Electronic Structure of Twelve Ferric Beta-Diketonate Complexes
Made available in DSpace on 2014-12-10T21:24:48Z (GMT). No. of bitstreams: 1 7219830.pdf: 5173657 bytes, checksum: 15d51025cc1d1032a45096c3b13b21fa (MD5) Previous issue date: 1972
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Relative rates of reaction of pyrite and marcasite with ferric iron at low pH
… sources were determined at 25°C and pH = 2.0 in ferric chloride solutions with initial ferric iron concentrations of 10⁻³ molal. The rate of the reaction: FeS₂ + 14Fe³⁺ + 8H₂O = 15Fe²⁺ + 2SO₄²⁻ + 16H⁺ was determined by calculating the rate of reduction of aqueous ferric ion from measured …
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Rates of reaction of covellite and blaubleibender covellite with ferric iron at ph 2.0
… covellite and covellite with 10⁻³ m ferric iron in a pH 2 solution were determined at 25, 35, and 50°C. Ferrous and cupric ion concentrations of the run solutions suggest that parallel reactions oxidized the sulfur to either elemental sulfur or to sulfate. The reaction that produces …
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Adsorption and co-precipitation of heavy metals on hydrous ferric oxides (HFO) from acidic waters
… (pH = 3.8 — 5.8) and in coexisting hydrous ferric oxides (HFO). Samples were collected from two sites, McAdoo, PA (acid mine drainage, AMD) and the Wharton State Forest (WSF), NJ (naturally acidic region). At McAdoo, Fe, Ni, Cd, and Mn concentrations exceeded USEPA and U.S. Public Health …
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