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Quantitative Analysis of Elements in Sediments and Soils by X-ray Fluorescence
Quantitative Analysis Elements X-ray Fluorescence
2012/2/13
Previous applications of the method of known additions for quantitative X-ray fluorescent analysis have assumed a linear relationship between peak intensity and concentration of the element being anal...
Clay Mineral Stability as Related to Activities of Aluminium, Silicon, and Magnesium in Matrix Solution of Montmorillonite-Containing Soils
Clay Mineral Stability Aluminium Silicon Magnesium Montmorillonite-Containing Soils
2012/2/13
The influence of geomorphological site characteristics on soil clay mineral stability of montmorillonite-containing horizons of a southern Wisconsin soil catena was interpreted in terms of the solute ...
Stabilization of Clay Soils Against Erosion Loss
Stabilization Clay Soils Against Erosion Loss
2012/2/15
Accelerated soil erosion from construction sites and the resulting increase in downstream sediment load constitute a significant environmental problem. Laboratory studies indicate that small percentag...
Quartz Presence in Relationship to Gibbsite Stability in Some Highly Weathered Soils of Brazil
Quartz Presence Gibbsite Stability Highly Weathered Soils
2012/2/15
Determination of the mineralogical composition of six highly weathered soils of the Central Plateau of Brazil showed that the sand content (predominantly quartz) was not related to the relative amount...
A Quantitative Method for the Determination of Montmorillonite in Soils
Quantitative Method Montmorillonite Soils
2012/2/13
A quantitative method for determination of montmorillonite in the soil clay fraction, using X-ray spectrometry, is proposed. The method is based on the fact that polyvinylpyrrolidone (PVP) is adsorbed...
Contributions of Forest Opal and Associated Crystalline Phases to Fine Silt Clay Fractions of Soils
Forest Opal Associated Crystalline Phases Silt Clay Fractions Soils
2012/2/15
The scanning electron microscope (SEM) is useful in the identification of biogenic opal. Opaline spheres, cups, and scrolled or convoluted sheets were identified in both soil and vegetative isolates. ...
‘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...
Clay Mineralogy of Some Silty Soils of the Inner Coastal Plains of Mississippi
Clay Mineralogy Silty Soils the Inner Coastal Plains Mississippi
2012/2/15
The chemical and mineralogical properties of six soils previously believed to be developed from coastal plain sediments were found to be significantly influenced by thin loess overlays and admixtures....
Determination of the Cation Exchange Capacity of Clays and Soils Using an Ammonia Electrode
Clays and Soils Determination of the Cation Ammonia Electrode
2012/2/15
The ammonia electrode serves as the basis of a simple, accurate method for determination of cation exchange capacity of small (ca. 50 mg) samples of clays. The technique is also capable of accurate me...
Trace Element Concentration in Amorphous Clays of Volcanic Ash Soils in Oregon
Trace Element Concentration Amorphous Clays Volcanic Ash Soils
2012/2/20
Clay fractions in soils from a transect of the Mazama ash deposit (6600-yr-old) contained more than 80% amorphous material. Instrumental neutron activation analysis was used to compare the trace eleme...
Swelling Characteristics of Compacted, Expansive Soils
Swelling Characteristics Compacted Expansive Soils
2012/2/20
The limitations of existing methods for the prediction of swelling behavior of compacted soils are examined. Both the purely theoretical approach and the purely empirical approach are found to be inad...
Relation of Potassium Exchange and Fixation to Degree of Weathering and Organic Matter Content in Micaceous Clays of Podzol Soils
Potassium Exchange Degree Weathering Organic Matter Content Micaceous Clays
2012/2/20
The rates of K exchange of untreated and peroxide-treated micaceous clays from five Podzol soils of increasing degrees of weathering were determined using sodium tetraphenyl boron. In addition, the am...
Clay Minerals in Pennsylvania Soils Relation to Lithology of the Parent Rock and Other Factors—I
Clay Minerals Pennsylvania Soils Lithology the Parent Rock Factors
2012/2/20
Clay mineral data have been obtained on 348 soil profiles representing 117 different soil series from 28 of Pennsylvania's 67 counties. The surface rock from which the soils were formed ranged from Pr...
pH Dependent Ion Exchange Properties of Soils and Clays from Mazama Pumice
pH Ion Exchange Properties Soils Clays
2012/2/20
Cation exchange capacity (CEC) measurements were made for whole pumice soil samples by several methods, including standard procedures involving cation saturation, excess salt removal, and cation displ...
The composition and physical properties of three clay soils were altered by introducing aluminum under an electro-chemical gradient in order to evaluate the role of pH in controlling changes in soil c...