Iron oxides
IRON OXIDES IN SOILS
... with iron oxides and organic matter, can be useful to develop effective strategies for sustainable management, especially in a scenario of increasing shortage of mineral phosphate ...to iron ...
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IRON OXIDES AND QUALITY OF ORGANIC MATTER IN SUGARCANE HARVESTING SYSTEMS
... of iron oxides, as well as on the content and quality of OM, which can compete with phosphate ions for sorption sites (Mesquita Filho & Torrent, 1993; Heredia & Cirelli, ...and oxides into ...
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Pedogenic iron oxides in soils of the Acre State, Brazil
... Fe oxides are governed by specific pedoenvironmental conditions, which makes the oxides useful indicators for pedoenvironmental and pedogenetic processes (KÄMPF & CURI, ...of iron oxides ...
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APPLICATION OF NANOSTRUCTURED IRON OXIDES AS ADSORBENTS AND PHOTOCATALYSTS FOR WASTEWATER REMOVAL.
... NANOSTRUCTURED IRON OXIDES AS ADSORBENTS AND PHOTOCATALYSTS FOR WASTEWATER POLLUTANT ...nanostructured iron oxides as adsorbent and photocatalyst for the removal of these contaminants has ...
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Field-scale spatial correlation between contents of iron oxides and CO
... and iron extracted from clays, which are closely related to the spectral reflectance of soil (Demattê et ...of iron oxides on soil respiration (La Scala et ...
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Textural and catalytic properties of chromium and copper-doped iron oxides.
... TEXTURAL AND CATALYTIC PROPERTIES OF CHROMIUM AND COPPER-DOPED IRON OXIDES. Chromium and copper-doped hematites were prepared with the aim of studying the synergistic effect of these dopants on the textural ...
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Iron oxides and their applications in catalytic processes: a review.
... IRON OXIDES AND THEIR APPLICATIONS IN CATALYTIC PROCESSES: A ...of iron oxides as catalyst in speciic processes, namely Haber-Bosch reaction, Fischer-Tropsch synthesis, Fenton oxidation and ...
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NICKEL ADSORPTION BY SOILS IN RELATION TO pH, ORGANIC MATTER, AND IRON OXIDES
... each tube, which were heated to 75ºC in a water-bath. Following this, 1.00 g sodium dithionite was added to each tube, stirring for one minute. After 15 minutes, samples were removed from the water bath and 10 mL of a ...
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Iron oxides and monazite from sands of two beaches in Espirito Santo, Brazil.
... IRON OXIDES AND MONAZITE FROM SANDS OF TWO BEACHES IN ESPIRITO SANTO, BRAZIL. Sand samples collected from two sampling sites on Guarapari and Iriri beaches, state of Espírito Santo, Brazil, were studied in ...
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What's the real role of iron-oxides in the optical properties of dust aerosols?
... of iron-oxides in the optical properties of dust aerosols becomes a key scientific question, and we address this problem by considering different refrac- tive indices, size distributions, and more logical ...
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Safety implications of high-field MRI: actuation of endogenous magnetic iron oxides in the human body.
... superparamagnetic iron oxides (SPIOs) are also used as contrast agents for ...of iron oxide-mediated actuation of cellular bioeffects, MRI, even at very high fields and gradients, appears to present ...
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Iron oxides dynamics in a subtropical Brazilian Paleudult under long-term no-tillage
... pedogenic iron oxides in the total clay fraction after adopting NT soil management are similar to those de- scribed by Silva Neto et ...crystalline iron oxides (hematite, goethite, and ...
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Effectiveness and stability of aluminium and iron oxides nanoparticles for arsenate adsorption
... Raman spectroscopy has also been a useful tool to identify arsenic compounds with environmental remediation purpose (Frost and Kloprogge, 2003; Frost et al., 2003; Frost et al., 2006), since its mobility and availability ...
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IRON OXIDES IN PLINTHIC SOILS ON SEDIMENTARY DEPOSITS IN NORTHEASTERN BRAZIL
... Whereas the conversion of ferrihydrite to hematite can occur by dehydration, the formation of goethite occurs by precipitation from the solution phase (Schwertmann & Taylor, 1989). Preferential reductive dissolution ...
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Pedogenic Iron Oxides in Iron-Rich Oxisols Developed from Mafic Rocks
... is more associated with magnetite oxidation inherited from the parent material (Curi and Franzmeier, 1987; Fontes and Weed, 1991) as well as transformation from other magnetic phases, such as magnesiumferrite commonly ...
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Magnetic iron oxides from a tuffite from Alto Paranaíba, state of Minas Gerais, Brazil.
... Os valores entre parênteses são incertezas do valor numérico, estimadas pelo desvio padrão calculado pelo algoritmo de minimização não-linear dos erros quadráticos, para ajuste dos espec[r] ...
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Chemical conversion of no and co on catalysts based on cobalt or iron oxides.
... Note que as temperaturas de redução do óxido de ferro puro são menores do que as observadas para o catalisador FeHbeta e não se observa redução em temperaturas acima de 800 ºC.. 20,21[r] ...
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In situ separation of soil types along transects employing Vis-NIR sensors: a new view of soil evaluation
... (iron oxides) and at 2200 nm for kaolinite (FORMAGGIO et ...the iron oxides in class RQo (Table ...and iron oxides (MADEIRA NETTO, 1993), as well as the higher clay content ...
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Mat. Res. vol.7 número1
... The iron oxides present in the corrosion layer were con- firmed by X-ray diffraction and are in accordance with the Figure 3. SEM cross-section of the G11 steel sample subjected to the real condition at 650 ...
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SIMULATION OF A DIRECT REDUCTION MOVING BED REACTOR USING A THREE INTERFACE MODEL
... the iron ore reduction, the shrinking core model has been used in most of the works, which assumes that there is a sharp interface between the reacted and unreacted zones (Beheshti et ...metallic iron) is ...
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