搜索结果: 31-45 共查到“矿床学与矿相学 SOILS”相关记录76条 . 查询时间(0.16 秒)
Quantification and Characterization of Maghemite in Soils Derived from Volcanic Rocks in Southern Brazil
Aluminum Substitution Ferrimagnetic Maghemite Magnetic Susceptibility Magnetite Selective Dissolution
2011/12/7
Abstract: Many soils developed from volcanic rocks in southern Brazil exhibit spontaneous magnetization caused by the presence of fine-grained maghemite (γ-Fe2O3), but few attempts were made to quanti...
Smectites in Iron-Rich Calcareous Soil and Black Soils of Taiwan
Black Soils Iron-Rich Calcareous Soil Mollisols Smectite Vermiculite Vertisols
2011/12/7
Abstract: The iron-rich calcareous soil (Typic Rhodustalf) from the Penghu island group represents a volcanic area. The black soils (Typic Haplustert, Vertic Endoaquoll, Typic Hapludolls) are typical ...
XAFS determination of the chemical form of lead in smelter-contaminated soils and mine tailings: Importance of adsorption processes
smelter-contaminated soils mine tailings adsorption processes oxyhydr
2012/3/31
Weinvestigatedsmelter-contaminatedsoilsfromEvin-Malmaison,Nord-Pas-de-Calais,
France,andminetailingsfromLeadville,Colorado,U.S.A.BulkPbconcentrationsrange
from460to1900ppminthetopsoilsatEvin-Malmais...
Use and Limitations of Second-Derivative Diffuse Reflectance Spectroscopy in the Visible to Near-Infrared Range to Identify and Quantify Fe Oxide Minerals in Soils
Crystal Field Bands Diffuse Reflectance Spectroscopy Goethite Hematite Intervalence Charge Transfer Iron Oxides Magnetite
2011/12/8
Abstract: We measured the visible to near-infrared (IR) spectra of 176 synthetic and natural samples of Fe oxides, oxyhydroxides and an oxyhydroxysulfate (here collectively called “Fe oxides”), and of...
Separation of Sub-Micron Particles from Soils and Sediments without Mechanical Disturbance
Clays Dialysis Dispersion Mobility Particles Sediments Separation Size Soils Submicron Swelling
2011/12/1
Abstract: A method is described for the separation of the finest particles from soils and sediments without mechanical disturbance. Particles are separated through the induction of osmotic stress. Gen...
Layer Charge Characteristics of Smectites in Salt-Affected Soils in Alberta, Canada
Layer charge Salinity Smectite
2011/12/1
Abstract: The layer charge characteristics of expanding phyllosilicates in four salt-affected soils in Alberta, Canada were investigated using X-ray diffraction analysis of alkylammonium saturated sam...
Mossbauer Spectroscopic Evidence for Citrate-Bicarbonate-Dithionite Extraction of Maghemite from Soils
Mossbauer spectroscopy Soil genesis
2011/12/1
Abstract: In a previous paper, we used powder X-ray diffraction and changes in magnetic susceptibility to argue the importance of pedogenic maghemite to soils and the efficacy of the chemical extracta...
Mineralogy of Rhizospheric and Non-Rhizospheric Soils in Corn Fields
Corn Mineralogy Non-rhizosphere Rhizosphere
2011/12/29
Technical limitations have restricted investigations of rhizosphere mineralogy. Various analytical techniques were applied to assess root-mineral associations and dynamics in natural soils under corn ...
Adsorption of Water Vapor by Soils: Investigations of the Influence of Organic Matter, Iron, and Aluminum on Energetic Heterogeneity of Soil Clays
Soil constituents Surface heterogeneity Water adsorption
2011/12/29
Water vapor adsorption isotherms were measured for samples of loessial soil clays modified by removing organic matter and Fe and Al compounds. The isotherms were analyzed by the exponential adsorption...
Nature of the Illitic Phase Associated with Randomly Interstratified Smectite/Illite in Soils
Chemical analysis Elementary particle High-resolution transmission electron microscopy Illite Interstratified Smectite Smectite/illite
2011/12/29
A dispersion-centrifugation-decantation procedure was used to isolate various particle size fractions from a sample of clay (<2 祄 fraction) separated by sedimentation from the Ap horizon of a Webster ...
Effect of pH on Zinc Adsorption and Solubility in Suspensions of Different Clays and Soils
Zinc Adsorption Solubility pH Clays Soils
2011/11/14
Zinc solubility in clay and soil suspensions was controlled by chemi-sorption at pH 4.5 - 7.0. Thesolubility in clay mineral suspensions was in the order
palygorskite < montmorillonite < kaolitlite a...
Effects of Freezing on Colloidal Halloysite: Implications for Temperate Soils
Fragipan Idaho Loess Tephra Transmission electron microscopy X-ray diffraction
2012/1/4
The literature reports that freezing of aqueous aluminosilicate clay suspensions can produce clay aggregates that disperse with agitation. Our experiments indicate that colloidal suspensions extracted...
High-Charge Smectite in Spanish “Rana” Soils
High-charge smectite Hydroxy-interlayer clays Illite Layer charge “Rana” soils Soil clay
2011/12/31
In a study of “raña” soils of central Spain, hydroxy-interlayered 2:1 clay minerals were identified in the upper horizons and high-charge smectite in the lower horizons, with kaolinite the most...
Relevance of Different Intercalation Tests for Distinguishing Halloysite from Kaolinite in Soils
Expansion treatment Halloysite Intercalation Kaolinite Soil clay
2012/1/5
The expandabilities of kaolin-group minerals in different horizons in 10 soils from New Zealand and Fiji were measured immediately after the application of formamide and after the sequential applicati...
Influence of Clay on Water Movement in Coarse-Textured Soils
Clay fraction Hydraulic conductivity Particle size Soil Water movement
2012/1/4
Effects of clay content on saturated hydraulic conductivities (k) of two coarse textured soils, Vista (mixed thermic Typic Xerochrepts) and Hanford (mixed nonacid Typic Xerorthents), and a medium text...
