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Showing 1 to 20 of 37 for “"sulphates"”.
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Dynamic Proton Polarization in Some Rare-Earth Ethyl-Sulphates
Made available in DSpace on 2015-05-12T21:41:40Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6706778.PDF: 4039406 bytes, checksum: a645ed42e2efa203cf4f5f733969f418 (MD5) Previous issue date: 1966
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Dynamic proton polarization in some rare earth ethyl sulphates
"Measurements of the dynamic polarization of protons by the solid state effect (""ef£et solide"") have been made at liquid helium temperatures on single crystals of erbium-doped and neodymium-doped yttrium ethyl sulphate ( (Er, Y)ES and (Nd, Y)ES). T he dynamic polarization was induced by …
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Sorption, degradation and transport of estrogens and estrogen sulphates in agricultural soils
… 17β-estradiol (E2), estrone (E1), and estrogen sulphates, i.e. 17β-estradiol-3-sulphate (E2-3S) and estrone-3-sulphate (E1-3S) excreted by livestock constitute a potential source for estrogen contamination in the environment. A method was developed to separate and quantify the hormones by …
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Property Changes and Mechanisms in Lime-Stabilised Kaolinite in the Presence of Metal Sulphates
… in the presence of the most commonly encountered sulphates in the soil (i.e. sulphates of calcium (gypsum), magnesium, sodium and potassium), and then in addition, establish whether inclusion of ground granulated blastfurnace slag (GGBS), which is used with Portland Cement (PC) and PC-blends to …
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Experimental and theoretical studies on the nucleation, growth and habit modification of some inorganic carbonates, phosphates and sulphates
… kinetics and growth of some inorganic sulphates and carbonates, in view of their growing importance as enviromentally friendly high surface area powders in detergent applications. Predictions of the crystal morphology based on lattice geometry laws have been obtained and compared to the …
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Role of sulphates and chloride ions in improved oil recovery in a hybrid smart-low salinity flooding technique
The growing demand for energy to cater for the growing world population has forced the exploitation and utilisation of existing hydrocarbon resources. Oil and gas are deemed the most conventional and common sources of energy, formed as a result of degradation of fossils deeply buried in …
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The effect of sulphur in fuel on the performance of automotive catalysts
… from the fuel, is stored as aluminium and cerium sulphates onto the washcoat. Upon a rapid change to fuel-rich engine operation the stored sulphates are released as hydrogen sulphide and is the cause for the smell observed. The sulphur storage/release process results in hydrogen sulphide emissions …
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Treatment of a multicomponent mining effluent using calcium hydroxide in a fluidized bed crystallizer
… saline wastewater rich in sodium and magnesium sulphates, since these salts are prevalent in most wastewater streams. The intention was to treat the wastewater with a calcium hydroxide (Ca(OH)2) suspension in a laboratory scale seeded fluidised bed crystallizer, thereby precipitating gypsum and …
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Some studies of the reaction between stannic chloride and silver perchlorate in anhydrous media
… be of interest to review the perchlorates and sulphates of that group.
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Investigating the Relationships Between Age and Depth of Stockpiled Topsoil with Its Nutrient Content: An Analysis of Responsible Factors and Potential Consequences
… electrical conductivity, calcium, nitrates and sulphates and some fixation of phosphates and potassium in age and depth of soil stockpiles. This could create challenges for the use of the stockpiled soils in reclamation.
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The Development of a Semi-Open Refrigeration Cycle for the Crystallisation of Aqueous Salts
… the production of both Iron (2) and Copper (2) Sulphates to be produced on a continuous basis.<br/><br/>The results showed that the crystals produced are of a small size, indicative of the instantaneous chilling of the mother liquor and are not contaminated to a significant degree with the …
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Aspects of ultrasonic relaxation spectrometry
… the interaction between anumber of sodium alkyl sulphates and N-polyvinylpyrrolidone, a synthetic polymer, in aqueous solution at detergent concentrations above and below the surfactant critical micelle concentration.Finally, counterion-polyion binding has been studied insolutions of a number of …
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Polymer impregnation of concrete as a means of improving corrosion resistance
… attack. Sulphides are formed from the sewage sulphates, by bacteria in the slime layers on the walls of the pipe. These diffuse, firstly into the liquid, and then into the sewer atmosphere as hydrogen sulphide, which is then in turn oxidised to sulphuric acid. Hydrogen sulphide gas is well …
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Engineering properties of sulphate-bearing clay soils stabilised with lime-activated ground granulated blast furnace slag (GCBS)
… elevated temperatures (30 °C). The presence of sulphates (6% gypsum=2.73% SO<sub>3</sub>) resulted in an accelerated increase in the strength development for stabilised kaolinite, which was comparable to that of stabilised Lower Oxford Clay. In the absence of sulphates, large ggbs additions were …
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The hydrated lime dissolution kinetics in acid mine drainage neutralization
… wastewater containing high concentrations of sulphates and dissolved heavy metals mainly ferrous iron. The dissolution of Ca(OH)₂ in aqueous solution is complex, which make its kinetics in AMD neutralization difficult to understand. The aim of this study was therefore to understand the Ca(OH)₂ …
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Physical Sulphate Attack on Concrete
Field experience with concrete exposed to sulphates has often shown that concrete can suffer from surface scaling above the ground level caused by physical sulphate attack. This type of attack has been ignored and, in some instances, confused with chemical sulphate attack. In addition, current …
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Chemical Modification on Gold Slides to Gain Better Control of Patterning Techniques
… as a result of this work:</p> <p> The groups of sulphates were determined to require minimum patterning forces as indicated. Sodium sulphate took a force of 49 n Potassium sulphate took a force of 45 nN Magnesium sulphate took a force of 744.4 nN</p> <p> The group of sodium and potassium halides …
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Determination of capillary electrophoretic methodology and its application as a mechanistic tool for gaining insight into the composition of, and detergent action on, coloured macromolecule fabric stains.
… analysis of anions in sample matrices including sulphates in detergents. The development and application of methods to analyse inorganic cations by CZE is also described. Previous published work had concentrated on the separation and analysis of cations from the same periodic group. This work …
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Supplementation of chelated Zn Cu and Mn in broiler diets to improve performance skin integrity and the incidence and severity of footpad dermatitis
… Cu, Mn and Zn, respectively (from inorganic sulphates) Negative control containing reduced inclusion levels of inorganic Cu, Mn and Zn at 8, 32 and 32 mg/kg, respectively (from inorganic sulphates) (HMTBA)2 chelated Cu, Mn and Zn at inclusion levels of 8, 32 and 32 mg/kg (from only …
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Sulphide ore minerals:surface chemical properties
… Fe202, Fe00H, Fe(OH)3, with iron II & III oxy-sulphates. The iron sulphides show variable extents of oxidation, indicating pyrite to be the most stable. Violarite shows stability to oxidation, suggested to result from both its stable spinel crystal structure, and from the rapid formation of …
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