搜索结果: 1-15 共查到“地质学 Iron Oxides”相关记录31条 . 查询时间(0.062 秒)
Effects of pH, ionic strength, temperature, and humic acid on Eu(III) sorption onto iron oxides
Iron oxides Eu(III) Sorption HA Temperature
2011/11/10
Effects of pH, Eu(III) concentration, ionic strength, temperature and humic acid (HA) on Eu(III) sorption to iron oxides were investigated in detail. The sorption of Eu(III) to iron oxides was signifi...
Alteration of microbially precipitated iron oxides and hydroxides
Alteration microbially precipitated iron oxides hydroxides
2012/4/1
Iron oxide and hydroxides can be precipitated from solution with both Fe21 and Fe31 states by a microbial consortium enriched from surface water draining a granitic batholith. The Fe21/Fe31 ratio of t...
Coprecipitates of Cd, Cu, Pb and Zn in Iron Oxides: Solid Phase Transformation and Metal Solubility after Aging and Thermal Treatment
Aging Study Coprecipitation Electron Microprobe Analysis Ferrihydrite Transformation Metal Solubility Rate of Titration Thermal Treatment
2011/12/8
Abstract: Solid phase transformation and metal solubility were monitored after coprecipitation of Cd2+, Cu2+, Pb2+ and Zn2+ with Fe3+ to form ferrihydrite by titration to pH 6. The (co)precipitates we...
Iron Oxides in a Soil Developed from Basalt
Hematite Ilmenite Maghemite Magnetic Fraction Mossbauer Spinel
2011/12/8
Abstract: A dusky red Oxisol forming on a tholeiitic basalt is found to contain varying proportion of aluminous hematite (Hm) and titanoaluminous maghemite (Mh) in the different size fractions. Maghem...
In Situ Infrared Speciation of Adsorbed Carbonate on Aluminum and Iron Oxides
Attenuated Total Reflectance-Fourier Transform Infrared Carbonate Adsorption Electrophoretic Mobility Infrared Point of Zero Charge Point of Zero Net Proton Charge X-ray Diffraction
2011/12/22
Abstract: Surface adsorption mechanisms of dissolved inorganic carbon species on soil minerals are not well understood. Traditional infrared (IR) study of adsorbed species of inorganic carbon using ai...
The Influence of Aluminum on Iron Oxides. Part XVI: Hydroxyl and Aluminum Substitution in Synthetic Hematites
Al substitution Cell-edge lengths Hematite LOI OH substitution X-ray intensity
2011/12/31
Synthetic hematites with Al substitutions between 0 and 18 mol % were synthesized at different temperatures and water activities. The cell-edge lengths a for different synthesis conditions decreased l...
Extraction of Iron Oxides from Sediments Using Reductive Dissolution by Titanium(III)
Dissolution Dithionite Extraction Goethite Hematite Reduction Titanium(III)
2012/1/4
A new iron oxide dissolution method designed to measure the abundance of “free” Fe oxide phases and associated elements in soils and sediments has been tested. The method employs a ternary complex of ...
The Influence of Aluminum on Iron Oxides. XV. Al-for-Fe Substitution in Synthetic Lepidocrocite
Aluminum Infrared spectroscopy Iron Lepidocrocite X-ray powder diffraction
2012/1/4
Lepidocrocite samples, γ-FeOOH, containing 0–10 mole % Al-for-Fe substitution were synthesized at 15°C and pH 8 by oxidizing mixed FeCl2-AlCl3 solutions. The unit-cell parameters a, b, and c were meas...
The Influence of Aluminum on Iron Oxides: XIV. Al-Substituted Magnetite Synthesized at Ambient Temperatures
Aluminum Goethite Iron oxide Magnetite Mossbauer spectroscopy X-ray powder diffraction
2012/1/4
Mixtures of magnetite and goethite were formed by the slow oxidation of mixed FeCl2-AlCl3 solutions in an alkaline environment at room temperature. The compositions of the products ranged from almost ...
Effect of Cobalt on the Formation of Crystalline Iron Oxides from Ferrihydrite in Alkaline Media
Cobalt Crystal growth Ferrihydrite Goethite Spinel Transmission electron microscopy
2011/11/30
Abstract: At pH 12 Co-ferrihydrite transformed to either Co-goethite or Co-magnetite, the latter compound appearing at Co additions of > 18 mole %. Although Co was readily taken up by the magnetite st...
Influence of Mn2+ and pH on the Formation of Iron Oxides from Ferrous Chloride and Ferrous Sulfate Solutions
Goethite Infrared spectroscopy Iron oxides Lepidocrocite Maghemite Manganese Synthesis X-ray powder diffraction
2012/1/6
The influence of Mn2+ on the formation of Fe oxides at pHs of 6.0 and 8.0 and varying Mn/Fe molar ratios (0, 0.1, 1.0, and 10.0) in the FeCl2-NH4OH and FeSO4-NH4OH systems was studied by X-ray powder ...
Influence of Manganese Oxide Minerals on the Formation of Iron Oxides
Akaganeite Cryptomelane Feroxyhyte Hausmannite Iron oxides Manganese Oxidation-reduction Pyrolusite Synthesis
2012/1/10
The influence of manganese oxide minerals (cryptomelane, hausmannite, and pyrolusite) on the formation of iron oxides was studied in the FeCl2-NH4OH system at different Mn/Fe molar ratios (0, 0.01, 0....
Mossbauer Spectroscopic Identification of Iron Oxides in Nontronite from Hohen Hagen, Federal Republic of Germany
Goethite Iron Maghemite Magnetic properties Mossbauer spectroscopy Nontronite
2012/1/9
Iron impurities in the Hohen Hagen nontronite (NG-1) were identified as maghemite and goethite. The phase identified as maghemite was magnetically ordered at both room temperature and 87 K, with hyper...
Electron Transfer Processes Between Hydroquinone and Iron Oxides
Electron spin resonance Electron transfer Ferrihydrite Goethite Hematite Hydroquinone Iron
2012/1/9
The kinetics of hydroquinone oxidation by aqueous suspensions of pure hematite and goethite-ferrihydrite mixtures at pH 6.0, 7.4, and 9 was studied using an on-line analysis system. The electron trans...
Properties of Iron Oxides in Two Finnish Lakes in Relation to the Environment of Their Formation
Al-substitution Ferrihydrite Genesis Goethite Iron oxide Lake environment
2012/1/11
Fifteen iron oxide accumulations from the bottoms of two Finnish lakes (搇ake ores? were found to contain as much as 50% Fe. Differential X-ray powder diffraction and selective dissolution by oxalate s...