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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 25 for “"Soluble iron"”.
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Removal of soluble iron and manganese from groundwater by chemical oxidation and oxide-coated multi-media filtration
… to continuously regenerated greensand for iron and manganese removal. Specific objectives were (1) to investigate the applicability for removing soluble manganese by adsorption and oxidation onto the surface of manganese oxide-coated media, and (2) to develop mathematical models to predict …
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Photochemistry of Polycyclic Aromatic Hydrocarbons with Environmentally Relevant Metals
… varying species of metals with an emphasis on iron. Bulk water suspensions of a standard soil and polycyclic aromatic hydrocarbons (PAH) were analyzed for soluble iron by inductively-coupled plasma mass spectroscopy (ICP-MS) following a 16 hour reaction period using simulated sunlight. …
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Mineralogy-based global anthropogenic combustion-iron emission inventory
Total and soluble iron modulate ocean biogeochemistry and global nitrogen and carbon cycle in over 40% of global ocean. The understanding of the current and future changes in oceanic productivity can be improved by understanding and constraining the atmospheric inputs of iron. Models generally …
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Reducing of iron corrosion in water pipelines by hydrogen addition
… of transport the water becomes polluted with soluble iron.;The corrosion of iron in the pipelines is the result of an oxidation reduction reaction. In that reaction hydrogen ion is reduced and the iron is oxidized. The hypothesis of this thesis is that the electrochemical potential of the …
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The performance of potassium permanganate and hydrogen peroxide oxidation and/or alum coagulation in the removal of complexed FE(II) from drinking water
… between particulate, colloidal, and soluble iron species was achieved through the use of 0.2 urn filters and 100K ultrafilters. Results from oxidation and ultrafiltration studies indicated incomplete complexation of the Fe(II) by DOC in solution. Following the addition of either …
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Quantitative Determination of the Elements in the Nodes and Internodes of Normal and Abnormal Corn Plants
… not caused by organisms but are in part due to soluble iron and aluminum compounds in the soil which have been taken up into the lower nodes of the corn plants and that the infection is secondary. This has been noted when lime and phosphorus have been deficient in the soil. It is believed that …
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Removal of complexed iron by chemical oxidation and/or alum coagulation
The fate of iron complexed by various organic compounds was investigated as a function of both chemical oxidative and coagulation removal methods. Dissolved organic carbon (DOC) utilized in the studies was obtained from a variety of sources and included humic and fulvic acids, tannic acid and …
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Methods to detect and quantitate spleen added to ground beef
… explore the feasibility of employing the storage iron compounds, hemosiderin and ferritin, as indicators for the detection and quantitation of spleen added to ground beef. Weighed amounts of ground beef and a composite spleen homogenate were combined to yield products with 0, 2.5, 5 and 10 percent …
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Strategies to improve non-haem iron absorption
Iron deficiency anaemia is one of the most prevalent nutritional deficiency disorders in the world. Food iron fortification is a widely used strategy to reduce the risk of deficiency but presents a major challenge to the food industry. The more bioavailable forms of iron, such as ferrous gluconate, …
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A Microcosm-Based Investigation into Oxidized Nitrogen Removal in the Hypolimnetic Waters of the Occoquan Reservoir of Northern Virginia
… of manganese. Once the nitrate was depleted, soluble manganese was released from the sediment first, followed by soluble iron. The release of phosphorus was not observed in this study after the depletion of nitrate, but nevertheless, was believed to occur. The absence of the release was …
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The performance of free chlorine and chlorine dioxide oxidation and/or alum coagulation for the removal of complexed Fe(II) from drinking water
Past research regarding complexed iron has focused on the resistance to and kinetics of oxidation by O₂(aq) and the extent of stabilization. The 0.45 um filter was typically used to differentiate between dissolved and particulate iron. This research investigated Fe(II) oxidation by free chlorine …
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Iron recovery from a representative water treatment plant sludge
… investigation was concerned with recovery of iron coagulant by chemical addition. Sulfuric acid, hydrochloric acid, and sodium hydroxide were added to a water treatment plant sludge containing precipitated iron. The acidic method of recovery proved to be technically feasible. Iron dissolved …
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Vergleichende Untersuchungen über den potentiellen Eintrag von Nährstoffen in den Wasserkörper von Talsperren durch Freisetzung aus dem Sediment
… phosphorus could be shifted from the reductively soluble iron bound phosphorus fraction into the stable aluminum bound phosphorus fraction.
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Evaluation of iron valence state alterations in thermally processed liquid model systems
… liquid model system fortified with 24 ppm of iron as either ferrous sulfate, ferric orthophosphate or ferric orthophosphate + 110 ppm ascorbic acid was thermally processed as 240, 250 and 260°F for 3, 6, 9, 12 and 15 minutes. Levels of elemental, nonelemental, soluble, total ionic and ferrous …
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Iron in the substrates and sporophores of Agaricus bisporus (Lange) Pilat during growth and development
The changes of the concentration of iron in the growth substrates and the sporophores of Agaricus bisporus (Lange) Pilat that occurred during culture under standard commercial conditions, were observed using atomic absorption spectrophotometry and iron-59 radiotracing techniques. The routes of …
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An Investigation of the destruction of ion exchange resins
… the use of Fenton's Reagent (Hydrogen Peroxide/soluble Iron catalyst) to destroy the resin by wet oxidation has been developed. This process converts 95% of the solid resin to gaseous CO2, thus greatly reducing the volume of radioactive waste that has to be disposed of. However, hydrogen …
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A Comparative Study of Iron and Zinc Concentration, Localization, Speciation and Bioavailability in Two Wheat Cultivars
Iron (Fe) and Zinc (Zn) deficiency remains a prevalent nutritional disorder worldwide, disproportionally affecting people of low and middle income countries due to the reliance on non-meat sources in the diet. Cereals, a relatively poor Fe and Zn source, account for over 50% of the energy intake in …
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Exploring Siderophore-Mineral Interaction Using Force Microscopy and Computational Chemistry
… diaspore. The affinity for the solid iron oxide surface reflected in the force measurements correlates with the specificity of azotobactin for aqueous ferric iron. Further, the adhesion force between azotobactin and goethite significantly decreases when small amounts of soluble iron …
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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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DISSOLUTION OF AEROSOL IRON IN SEA WATER USING FLOW-INJECTION WITH CHEMILUMINESCENCE DETECTION
Iron is an essential micronutrient for the metabolism of marine organisms and impacts on primary productivity and hence indirectly on climate change. The dominant source of iron to the sea surface in open ocean regions is from the atmosphere by aeolian dust transport but the solubility of iron from …
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