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‘Vermiculite’Determination on Whole Soils by Cation Exchange Capacity Methods
Vermiculite Whole Soils Cation Exchange Capacity
2012/2/15
The proposed method is a modification of one by Alexiades and Jackson (1965). Calcium exchange capacity (CaEC) and potassium exchange capacity (KEC) are determined, after removal of organic matter and...
Mineralogy and Cation Exchange Properties of Libby Vermiculite Separates as Affected by Particle-Size Reduction
Mineralogy Cation Exchange Properties Libby Vermiculite Particle-Size Reduction
2012/2/15
A vermiculite (Libby, Montana) sample obtained from the Zonolite company contained mostly coarse-grained separates with only 8? per cent clay. The 2?0 祄 fraction was used for particle-size reduction s...
Experimental Transformation of a Chlorite into a Vermiculite
Experimental Transformation Chlorite Vermiculite
2012/2/15
An orthochlorite (sheridanite) was heated to 610°C to dehydroxylate the hydroxide sheet and to oxidize ferrous iron. The heated sample was shaken for 20 min in a mixed solution of 0–2 N HCl and 0–2 N ...
Fixing Cation Interaction with Blister-Like Osmotic Swelling on Vermiculite Cleavages
Cation Interaction Blister-Like Osmotic Vermiculite Cleavages
2012/2/15
The shrinkage of osmotically swollen natural and artificial blisters on vermiculite cleavages by exchange saturation with fixing cations such as Cs+, Rb+, NH4+, and K+ was investigated by replica elec...
Segregation and Exchange Properties of Alkylammonium Ions in a Smectite and Vermiculite
Segregation Exchange Properties Alkylammonium Ions Smectite Vermiculite
2012/2/15
X-ray diffraction analysis of mixed alkylammonium-exchanged smectite revealed segregation of different ion species into randomly ordered layers. Vermiculite, however, showed segregation into crystalli...
Calcium-Magnesium Exchange in Montmorillonite and Vermiculite
Calcium-Magnesium Montmorillonite Vermiculite
2011/11/17
Abstract: An experimentally determined Ca-Mg exchange isotherm of montmorillonite is reported. The selectivity coefficient of this exchange over a wide range of Mg saturation was calculated and found ...
The Nature of Kenya Vermiculite and Its Aluminum Hydroxide Complexes
Kenya Vermiculite Its Aluminum Hydroxide Complexes
2011/11/17
Abstract: A specimen of Kenya vermiculite contained no mica or chlorite layers either as separate phases or as components of an interstratified structure. Dehydroxylation occurred in two stages, at 55...
Sodium-Lithium Exchange Equilibria on Vermiculite at 25° and 50°C
Sodium-Lithium Exchange Equilibria Vermiculite
2012/2/20
Sodium-lithium exchange equilibria between dilute aqueous chloride solutions and 0.2–62 µ Transvaal, South African vermiculite were studied at 25° and 50°C using a dialysis technique. The K cont...
Vermiculite as a Model System in the Testing of Double Layer Theory
Vermiculite Model System Double Layer Theory
2012/2/20
The microelectrophoretic and adsorption behaviour of lithium vermiculite has been studied as a function of lithium chloride concentration. This was done in an attempt to establish the applicability of...
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,...
I.R. Study of Alkyl-Ammonium Vermiculite Complexes
I.R. Study Alkyl-Ammonium Vermiculite Complexes
2012/2/20
Two octyl-ammonium vermiculite complexes with different 001 periodicities have been studied by i.r. spectroscopy. In each case i.r. spectroscopy affords information on the orientation of the — NH3+ gr...
Surface Area of Vermiculite with Nitrogen and Carbon Dioxide as Adsorbates
Surface Area Vermiculite Nitrogen Carbon Dioxide Adsorbates
2012/2/20
Surface-area studies were made on several homoionic vermiculites with both nitrogen and carbon dioxide as adsorbates. These studies show that only very slight penetration occurs between individual ver...
Formation of Hydroxy-Al and -Fe Interlayers in Montmorillonite and Vermiculite: Influence of Particle Size and Temperature
Formation Hydroxy-Al -Fe Interlayers Montmorillonite Vermiculite Particle Size Temperature
2012/2/21
Hydroxy-Al and -Fe interlayers were prepared in 乬mono-mineralic乭 fine and coarse clay montmorillonite and coarse clay and silt vermiculite at 3亱C and 21亱C. The formation of hydroxy interlayers was eva...
Compositional Variation of a Vermiculite as Related to Particle Size
Vermiculite Particle Size
2011/11/16
A vermiculite regolith sample from Llano, County, Texas, was divided into 16?2, 8?6, 4?, 2?, 1?, 綎1, 紪? 1 10 柤, and 5 100 ?1 10 micron equivalent spherical diameter size-classes. A well-crystallized v...
Influence of Exchange Ions on the b-Dimensions of Dioctahedral Vermiculite
Exchange Ions b-Dimensions Dioctahedral Vermiculite
2011/11/16
The 1? ?size fractions of different ground muscovites were treated for a 30-day period for K+ removal with a pH 7.5 solution containing sodium tetraphenylboron. The initial K+ contents ranged from 211...