搜索结果: 46-59 共查到“知识库 凹凸棒石 soil”相关记录59条 . 查询时间(0.151 秒)
Characterization of Morphological Features of Soil Micas Using Scanning Electron Microscopy
Exfoliation Mica Muscovite Splitting Weathering
<
2012/2/10
Morphological changes occurring in naturally weathered micas in seven residual soils from Ontario were studied. Splitting, exfoliation of the (100) planes, surface coats, filling of spaces with soil m...
Amorphous and Crystalline Titanium and Iron-Titanium Oxides in Synthetic Preparations, at near Ambient Conditions, and in Soil Clays
Anatase Goethite Hematite Iron Pseudorutile Synthesis Titanium
<
2012/2/10
A series of mixed iron and titanium oxide coprecipitates ranging in composition between 0 < Ti/Ti + Fe < 1 was synthesized and aged under varying conditions of pH, temperature and time in order to est...
Properties and Quantitative Estimation of Poorly Crystalline Components in Sesquioxidic Soil Clays
Quantitative Estimation Poorly Crystalline Components Sesquioxidic soil clays
<
2012/2/13
Sesquioxidic soil clays from Oxisols in South Africa, Australia and Brazil, and two clays from Andosols in Japan and New Zealand, were investigated by selective dissolution techniques. Acid ammonium o...
The stability of smectite separated from a Houston Black clay soil was studied by solubility methods in an acid environment. High Silicon levels (supersaturated with respect to amorphous Si) probably ...
Cation and Silica Relationships of Mica Weathering to Vermiculite in Calcareous Harps Soil
Relationships Mica Calcareous Harps Soil
<
2012/2/13
A steady state reaction of apparent equilibrium of K mica + Ca2+ ⇄ Ca vermiculite + K+ was indicated by prolonged dissolution extractions from Blount soil clay (from northern Indiana) abundant i...
Soil Minerals in the System Al2O3-SiO2-H2O: Phase Equilibrium Model
Soil Minerals Phase Equilibrium Model Al2O3-SiO2-H2O
<
2011/11/18
Abstract: Mineralogical reactions in the system Al2O3-SiO2-H2O are examined and an isothermal, isobaric cross-section of the portion of the system applicable to soil genesis, is determined. The releva...
Scanning Electron Microscopy of Cherts in Relation to the Oxygen Isotopic Variation of Soil Quartz
Scanning Electron Microscopy Cherts Oxygen Isotopic Variation Soil Quartz
<
2012/2/15
Quartz isolated from soils by the pyrosulfate-H2SiF6 method and chert samples of various origins were examined with the scanning electron microscope. Quartz isolates of the 20?0 祄 from the A2 and B2lt...
Isomorphous Substitution of Iron for Aluminium in some Soil Kaolinites
Isomorphous Substitution Iron Aluminium Soil Kaolinites
<
2012/2/14
Clay (<2 祄) and fine silt (2?0 祄) fractions of twenty seven soil samples from eight tropical ferruginous profiles of the Mysore Plateau (India) were analysed for kaolinite by dehydroxylation and selec...
Swelling Chlorite in a Soil of the Dominican Republic
Swelling Chlorite Soil the Dominican Republic
<
2012/2/13
A 1–0·2 µm fraction from a soil in the Dominican Republic was studied by X-ray diffraction combined with solvation, cation saturation, and heat treatments. I.R., thermal (DTA, TGA) and chemical ...
Mossbauer Studies of Small Particles of Iron Oxides in Soil
Mossbauer Studies Small Particles Iron Oxides in Soil
<
2012/2/15
A soil of Attica (Greece) has been studied by Mössbauer spectroscopy and magnetization measurements in order to ascertain the nature and form of iron oxides present in it. The room temperature sp...
Factors Affecting Potassium Fixation and Cation Exchange Capacities of Soil Vermiculite Clays
Potassium Fixation Cation Exchange Capacities Factors Soil Vermiculite Clays
<
2012/2/20
Soil vermiculite clays of varying tetrahedral and octahedral composition and cation exchange capacity (CEC) were examined for their ability to fix K+ in both the wet and dry states. Fixation capacity,...
Titanium as Free Oxide and Substituted Forms in Kaolinites and Other Soil Minerals
Titanium Free Oxide Substituted Forms Kaolinites Soil Minerals
<
2012/2/20
Titanium in TiO2 minerals was differentiated from that isomorphously substituted into minerals by the use of dihydrogen hexafluorotitanate (hydrofluotitanic acid, H2TiF6), which selectively dissolved ...
Soil Minerals in the Al2O3-SiO2-H2O System and a Theory of Their Formation
Soil Minerals Theory Al2O3-SiO2-H2O Formation
<
2012/2/20
An attempt has been made to assemble the best thermodynamic information currently available for soil minerals in the Al2O3-SiO2-H2O system at 25°C and 1 atm. Montmorillonite is included by considering...
Interactions Between Montmorillonite and a Soil Humic Compound
Montmorillonite Soil Humic Compound Interactions
<
2011/11/16
Abstract: Interactions between montmorillonite and fulvic acid* extracted from a Podzol soil were investigated by X-ray and chemical methods.Adsorption of fulvic acid by montmorillonite strongly depen...