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PRETREATMENT OF SOILS AND CLAYS FOR MEASUREMENT OF EXTERNAL SURFACE AREA BY GLYCEROL RETENTION
SOILS CLAYS GLYCEROL RETENTION
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2011/11/15
Heat treatment at 600~ has been the usual procedure for irreversible collapse of expanding clay minerals prior to determination of the external surface area of clays and soils by glycerol retention. E...
Preparation, Swelling and Water-retention Properties of Crosslinked Superabsorbent Hydrogels Based on Guar Gum
Superabsorbent hydrogel Guar gum Sodium acrylate Water absorption Water retention
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2011/12/13
Utilization of natural polymer as matrix for preparing hydrogels can improve the performance of the materials and render them environmentally friendly. In this work, the guar gum-g-poly(sodium acrylat...
Retention and Transport of Hexavalent Chromium in Calcareous Karst Soils
Hexavalent chromium calcareo
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2009/7/7
Hexavalent chromium, which is a highly toxic and soluble form of the element chromium, is a common soil and groundwater contaminant found in many contaminated sites throughout the world and poses a s...
RETENTION OF FLUORIDE FROM INDUSTRIAL ACIDIC WASTEWATER AND NaF SOLUTION BY THREE TUNISIAN CLAYEY SOILS
Acidic wastewater Clayey soil Fluoride removal Freundlich isotherm model Industrial wastewater Langmuir isotherm models Tunisian clayey soils
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2011/11/11
Clayey soil samples, Sebkhat El Malah-El Mkhacherma (MK), Jebel Haidoudi (H), and Zemlet El Beidha (ZB), from three regions in Southeast Tunisia were evaluated for their effectiveness to remove fluori...
Why the phosphorus retention of lakes does not necessarily depend on the oxygen supply to their sediment surface
phosphorus retention of lakes oxygen supply sediment surface
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2014/5/20
In order to improve the trophic state of Lake Sempach, a eutrophied lake in central Switzerland, its external phosphorus (P) load has been decreased and its hypolimnion has been artificially oxygenate...
Effects of Exchange Cations and Layer-Charge Location on Cysteine Retention by Smectites
Cysteine CMS Source Clay SAz-1 FTIR Homoionic Smectites Layer Charge Thermal Analysis XRD
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2011/12/7
Abstract: This study investigates the complexes formed between amino acids, which are the natural degradation products of organic matter, and smectites. Thus, the adsorption and desorption behavior of...
Water Retention by Colloidal Allophane and Imogolite with Different Charges
Allophane Imogolite Net Charge pH Pressure Potential Water Retention
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2011/12/8
Abstract: Water retention curves of colloidal allophane and imogolite with different charges and different pretreatments were measured using a tension plate and a pressure plate apparatus. An irrevers...
Influence of Water on the Retention of Organic Probes on Clays Studied by IGC
Illite Inverse Gas Chromatography Kaolinite Surface Energetic Heterogeneity Water Adsorption
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2011/12/22
Abstract: Oil recovery is strongly related to the wettability of reservoir rocks that are formed of quartz grains attached by mineral hydroxides and clay minerals. Illites and kaolinites are the most ...
Retention of Cobalt by Pure and Foreign-Element Associated Goethites
Al-goethite Cd-goethite Co-extraction Co-sorption Cu-goethite Micropore diffusion Si-goethite
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2011/12/27
Retention studies of the cobalt-goethite system were carried out using synthetic, star-shaped and lath-shaped pure, Al-, Cd-, Cu- and Si-associated goethites. Aluminium and Si are commonly occurring f...
Charge Reduction, Octahedral Charge, and Lithium Retention in Heated, Li-Saturated Smectites
Alkylammonium exchange Cation-exchange capacity Hofmann-Klemen effect Layer-charge reduction Lithium Octahedral charge
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2012/1/11
Reference smectites were examined to determine relationships between Li uptake, cation-exchange capacity (CEC), and octahedral layer charge after Li saturation and heating at 250°C (Hofmann-Klemen eff...
Cation and Anion Retention by Natural and Synthetic Allophane and Imogolite
Adsorption Allophane Anion retention Cation retention Imogolite SiO2/Al2O3 ratio Surface charge
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2012/2/6
The negative surface charge of synthetic allophanes with a range of Si/Al ratios decreased and positive charge increased with increasing alumina content at a given pH. The phosphate adsorption capacit...
Kaolins: Sources of Differences in Cation-Exchange Capacities and Cesium Retention
Cation-exchange capacity Cs retention Interlayer wedges Kaolinite Vermiculite
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2012/2/9
Seven kaolins from Georgia (southeastern U.S.A.), ranging from high to low commercial grade, were characterized by X-ray powder diffraction and chemical techniques to establish that the variation in q...
Retention of Crude Oil Bases by Clay-Containing Sandstone
Retention Crude Oil Bases Clay-Containing Sandstone
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2012/2/21
Retention of basic components of a crude oil by clay-containing reservoir sandstone was studied by flowing crude oil through cores and monitoring the concentration of bases in the effluent. Cores that...