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Rozprawy doktorskie na temat „Selected mineral”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Frost, Ray. "Studies of selected minerals, mineral surfaces and their colloidal dispersions." Thesis, Queensland University of Technology, 2001.

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This thesis is about the molecular structure of minerals, their surface modification and the dispersion of selected minerals of a ceramic nature as sols and gels. The theme that permeates through this work and connects the different elements of the work is the search for fundamental knowledge and understanding of mineral structure and mineral surface structure. The underlying principal is that of molecular structure of surfaces and the changes in that molecular structure through modification of the surfaces. There are seven research divisions of study reported in this thesis: (A) Molecu

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Gulu, Zada Leyla [Verfasser]. "Sorption of Selected Pesticides on Mineral Surfaces : Factors and Mechanisms / Leyla Gulu Zada." Tübingen : Universitätsbibliothek Tübingen, 2021. http://d-nb.info/1228858268/34.

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Nekoofar, Mohammad Hossein. "The effect of contamination on selected physical and chemical characteristics of mineral trioxide aggregate." Thesis, Cardiff University, 2011. http://orca.cf.ac.uk/14248/.

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Aim: To evaluate the effect of various environmental (clinical) conditions on the physical and chemical characteristics of Mineral Trioxide Aggregate (MTA). Methodology: Initially preparation of specimens was standardised. Moreover, a novel mixing technique, trituration of encapsulated MTA, was developed. The effects of acid and blood contamination on various characteristics of MTA including compressive strength, surface microhardness, push-out bond strength and total porosity were then evaluated. Furthermore, by using X-ray diffraction analysis the hydration process of blood contaminated MTA

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Johnson, Samantha. "Mineralization pattern, mineral phases, and selected elemental analysis of the dorsal carapace of postecdysial blue crabs, Callinectes sapidus /." Electronic version (PDF), 2006. http://dl.uncw.edu/etd/2006/johnsons/samanthajohnson.pdf.

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Kingwell, Elaine. "The effects of bone mineral density testing on health related behaviours in a randomly selected population of Canadians." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/31367.

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Osteoporosis is a major health problem that can be mitigated by accurate prediction of future risk for bone fractures. Bone mineral density (BMD) testing can be conducted to assess people's risk of fracture, but its value rests on the ability to provide risk information effectively to those individuals who have low BMD; those individuals must then be willing to initiate and maintain recommended lifestyle behaviours and medications. This study assessed the influence of low BMD results and direct-to-participant feedback of results on awareness of diagnosis, information seeking about osteoporosis

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Luseba, Dibungi. "The effect of selenium and chromium on stress level, growth performance, selected carcass characteristics and mineral status of feedlot cattle." Pretoria : [s.n.], 2002. http://explore.up.ac.za/record=b1545209.

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Luseba, Dibungi. "The effect of selenium and chromium on stress level, growth performance, selected carcass characteristics and mineral status of feedlot cattle." Thesis, University of Pretoria, 2001. http://hdl.handle.net/2263/23376.

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Feedlot cattle are subjected to numerous stresses that impede on their growth performance and carcass quality. Stress also depletes the animal body with its nutrients subsequently leading to deficiencies. The aim of this study was to investigate the effect of selenium (Se) and chromium (Cr) on stress and subsequently on growth performance, carcass characteristics including meat colour and liver tissue minerals. It is thought that Se, as anti-oxidant and Cr effectiveness in glucose metabolism might be effective on these production parameters. Four experiments were conducted for that purpose. Th

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Grenier, Aline M. "Influence of selected endomycorrhizal fungi and phosphorus fertilization on the growth and mineral nutrition of onion grown in newly reclaimed organic soil." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=69533.

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Onions are highly responsive to endomycorrhizae and improved plant growth is among the benefits associated with this symbiosis, particularly in low phosphorus soils. Although this crop is grown extensively in organic soils, few studies have been conducted on these. Onion plants (Allium cepa L. cv. Norstar) were inoculated with Glomus aggregatum Schenck & Smith, Glomus clarum Nicolson & Schenck, Glomus fasciculatum Gerdemann & Trappe, Glomus intraradix Schenck & Smith and Glomus versiforme (Karst.) Berch and grown in the field and under controlled conditions to evaluate their efficiency in newl

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Ramahlo, Masetle Nelson. "Physico-chemical and biological characterization of soils from selected farmlands around three mining sites in Phalaborwa, Limpopo Province." Thesis, University of Limpopo (Turfloop Campus), 2013. http://hdl.handle.net/10386/1127.

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Thesis (M.Sc. (Soil Science)) --University of Limpopo, 2013<br>The study was conducted to assess the impact of mining activities on selected soil physical, chemical and microbial properties on farmlands around three selected mining sites. Nine soil samples were collected from each of the following farms : Hans Merensky, Mogoboya and Leon Tom, Foskor Mine and JCI mining sites, respectively. Additional nine soil samples were collected from non-polluted Waterbok farm that serves as a control for the purpose of comparison. The samples were taken at 0–15, 15–30, 30–45 cm depths at three sampling po

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Liphapang, Lebohang Irene. "An analysis of corporate social responsibility (CSR) in the mining industry: selected JSE/SRI listed mining companies in South Africa." Thesis, Nelson Mandela Metropolitan University, 2017. http://hdl.handle.net/10948/18277.

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The South African mining industry has been, and continues to be, the main contributor of the country’s GDP. The listed mining companies have a great contribution to the market capitalisation of the Johannesburg Stock Exchange (JSE, 2014). Pre-1994, the mining companies had been under scrutiny for a wide range of negative environmental and social impacts in their operational areas. The mining companies were accused of a lack of sustainability plans, carbon emissions, land rehabilitation plans, pollution and lack of community engagement (Buccasa, 2013). Corporate social responsibility (CSR) has

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Sihlahla, Kyllikki Taina Niita Ndangi. "Perceptions on the impact of strikes on productivity at selected mines in the mining sector of Namibia." Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2081.

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Thesis (MTech (Human Resource Management))--Cape Peninsula University of Technology, 2016.<br>The mining sector has been the backbone of the Namibian economy since Namibia attained its independence. However, the disruptive nature of the numerous strikes that are experienced in the mining sector has prompted this study that explores the perceptions held by different stakeholders on the impact of strikes on the productivity of three selected mines in Namibia. The selected mines are Langer Heinrich mine, Navachab Gold mine and Skorpion Zinc mine. Labour disputes in Namibia’s mining sector have a

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Sparks, Patricia Lynne. "The relationship of vitamin D and selected nutrient intakes, sex hormone binding globulin and markers of bone turnover to bone mineral density in exercising and non-exercising postmenopausal women taking or not taking HRT." Diss., The University of Arizona, 2001. http://hdl.handle.net/10150/289711.

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The loss of bone mineral density (BMD) plays a major role in the increased incidence of osteoporosis in aging women and, consequently, strategies to maintain BMD are critical to quality of life for these women. The role of vitamin D in the accrual and maintenance of bone mineral and its relationship to the incidence and severity of osteoporosis is not well understood. By measuring serum and intake levels this study investigates the relationship of vitamin D to baseline BMD and changes in regional and total body BMD over 1 y. The role of sex hormone binding globulin (SHBG) is also investigated.

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Paeche, Helen. "Cathodoluminescence signature of selected minerals of South Australia /." Title page and abstract only, 1995. http://web4.library.adelaide.edu.au/theses/09S.B/09s.bp126.pdf.

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Scott, Graeme. "Crystal chemistry and synthesis of selected borosilicate minerals." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43779.

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Borosilicates are oxygen-bearing boron minerals in which SiO₄ tetrahedra form an important structural component. They represent widespread constituents of rocks originating in the Earth’s crust and commonly provide insight into the rock-forming processes. Important borosilicates include tourmaline, axinite, werdingite, boralsilite, dumortierite, holtite, howlite, and grandidierite. Tourmaline is the most widespread borosilicate mineral and it can be used to study a wide variety of geological processes based on its high compositional variability. Dumortierite [(Al,☐)Al₆(BO₃)Si₃O₁₃(O,OH)₂] is se

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Origlieri, Marcus Jason. "Crystal Chemistry of Selected Sb, As, and P Minerals." Tucson, Ariz. : University of Arizona, 2006. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu%5Fetd%5F1387%5F1%5Fm.pdf&type=application/pdf.

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Origlieri, Marcus Jason. "Crystal Chemistry of Selected Sb, As, and P Minerals." Diss., The University of Arizona, 2005. http://hdl.handle.net/10150/194240.

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The crystal structures of the related minerals triploidite (Mn2PO4OH) and zwieselite (Fe2PO4OH) are discussed. Order-disorder of OH- and F- in these structures is discussed using the results of new crystal structure refinements, and correlation with the results of Raman spectroscopic study in the hydroxyl stretching region. Cryogenic crystal structure refinement of triploidite allowed the distinction of separate OH- and F- sites in the mineral.A new mineral, natural AsSbO3, has been found at Tsumeb, Namibia. Its occurrence has implications on the closing stage of ore formation at this mine.

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Crane, Martin John. "Geochemical studies of selected base metal minerals from supergene zone /." View thesis, 2001. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030721.132607/index.html.

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Thesis (PhD) -- University of Western Sdyney, 2001.<br>"A thesis presented in accordance with the regulations governing the award of the degree of Doctor of Philosophy, University of Western Sydney" "November 2001" Bibliography: leaves 249 - 254.

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Crane, Martin John, University of Western Sydney, of Science Technology and Environment College, and of Science Food and Horticulture School. "Geochemical studies of selected base metal minerals from the supergene zone." THESIS_CSTE_SFH_Crane_M.xml, 2001. http://handle.uws.edu.au:8081/1959.7/232.

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Acid leaching of different natural chrysocolla samples under ambient conditions demonstrated that the chemical and chrystallographic inhomogenity significantly affects the rate and that it is virtually impossible to use the mineral as a model for the kinetics of hydrometallurgical processing of copper ores.Dissolution experiments, stability diagrams,and X-ray powder diffraction studies are undertaken and studied in this research and results are given.It is found that a complete solid solution series exists in Nature with most tungstenian wulfenites and molybdenum stolzites containing a range o

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Bahfenne, Silmarilly. "Single crystal Raman spectroscopy of selected arsenite, antimonite and hydroxyantimonate minerals." Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/46234/1/Silmarilly_Bahfenne_Thesis.pdf.

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This thesis concentrates on the characterisation of selected arsenite, antimonite, and hydroxyantimonate minerals based on their vibrational spectra. A number of natural arsenite and antimonite minerals were studied by single crystal Raman spectroscopy in order to determine the contribution of bridging and terminal oxygen atoms to the vibrational spectra. A series of natural hydrated antimonate minerals was also compared and contrasted using single crystal Raman spectroscopy to determine the contribution of the isolated antimonate ion. The single crystal data allows each band in the spectrum t

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Mhonde, Ngoni Pepukai. "Investigating collector and depressant performance in the flotation of selected iron ores." Master's thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/22742.

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As the excessive extraction of high grade iron ore reserves has led to the rapid depletion of these ore bodies, there is a growing need to extract and upgrade low grade iron ores into more economically viable products with an iron content in excess of 50%. The beneficiation of low grade iron ores through the reverse cationic flotation procedure is gradually gaining popularity as a possible processing route of the future for South Africa's iron industry. Reverse cationic flotation employs a reagent suite consisting of an amine compound which functions as a quartz collector in addition to provid

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Hageman, Mark Robert. "Chemical compositions of selected minerals within Harzburgite from the Leucite Hills, Wyoming /." Connect to resource, 1986. http://hdl.handle.net/1811/36788.

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Cruzado, Tafur Edith Maricela. "Assessment of accumulation of selected metals by native plants growing in polluted peruvian post-mining areas." Doctoral thesis, Pontificia Universidad Católica del Perú, 2021. http://hdl.handle.net/20.500.12404/19152.

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Metal mining is one of the economic pillars of the Peruvian economy. Peru is the main producer of gold, zinc, lead, and tin in Latin America and the second largest producer of copper, silver, and zinc worldwide. Despite its economic importance, mining has also left a plethora of Mining Environmental Liabilities (MEL) whose inadequate waste management represents a risk for both the environment and human health and is a common trigger of social problems. The Cajamarca región is the second región in Peru in terms of the number of MEL sites with the majority of them located in the Hualgayoc distri

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Van, den Berg Jana. "Taxing the Minerals Sector in South Africa: a comparative analysis of the proposed tax model for South Africa and the models adopted in selected African countries." Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1017545.

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The State Intervention in the Minerals Sector Report emerged as a resolution during the 3rd National General Council Resolution on Economic Transformation held in 2012, during which the Council stated that: “The ANC’s approach to economic transformation of the South African economy should always be holistic and comprehensive, covering all sectors of the economy. In this regard, the ANC should ensure greater state involvement and control of strategic sectors of the economy, such as mining, energy, the financial sector and others.” It was for this reason that the National General Council mandate

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Engelbrecht, Johannes Zacharias. "An analysis of the sustainable mining of selected minerals and metals in South Africa / Johannes Zacharias Engelbrecht." Thesis, North-West University, 2011. http://hdl.handle.net/10394/8447.

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The study was done to understand the direction in which South Africa’s mining model is developed and the changes required for South Africa to take its rightful place in the mainstream spheres of economic and commercial affairs. The huge demand for African commodities is creating new opportunities for African governments to realise the hopes of their people for a better life. The objective of this study is to analyse the South African mining model to determine the sustainability of mining in South Africa. It was done by analysing Chrome, Coal and Platinum as selected minerals and metals. A lite

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Snellgrove, Donna Leanne. "Dietary availability and retention of selected minerals associated with the intensive production of rainbow trout (Oncorhynchus mykiss)." Thesis, University of Plymouth, 2003. http://hdl.handle.net/10026.1/2325.

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This research programme aimed to review the nutritional requirements for the main minerals, (namely calcium, phosphorus, magnesium and zinc) formulated in commercial diets that are essential for the health and growth performance for salmonid fish. This was undertaken with the aim of improving our knowledge of their physiology, metabolism and fate in the rainbow trout, Oncorhynchus mykiss. Phosphorous (P) featured strongly in this work due to its adverse role in pollution and the environmental impact of intensive fish farming. The first chapter surveyed the gross nutritional requirements of fis

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Becker, Megan. "The mineralogy and crystallography of pyrrhotite from selected nickel and PGE ore deposits and its effect on flotation performance." Thesis, Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-09272009-100136/.

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Ulian, Gianfranco <1985&gt. "Ab initio quantum mechanical investigation of structural and chemical-physical properties of selected minerals for minero-petrological, structural ceramic and biomaterial applications." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6475/1/Ulian_Gianfranco_Tesi.pdf.

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The purpose of this thesis is the atomic-scale simulation of the crystal-chemical and physical (phonon, energetic) properties of some strategically important minerals for structural ceramics, biomedical and petrological applications. These properties affect the thermodynamic stability and rule the mineral-environment interface phenomena, with important economical, (bio)technological, petrological and environmental implications. The minerals of interest belong to the family of phyllosilicates (talc, pyrophyllite and muscovite) and apatite (OHAp), chosen for their importance in industrial and bi

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Ulian, Gianfranco <1985&gt. "Ab initio quantum mechanical investigation of structural and chemical-physical properties of selected minerals for minero-petrological, structural ceramic and biomaterial applications." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amsdottorato.unibo.it/6475/.

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The purpose of this thesis is the atomic-scale simulation of the crystal-chemical and physical (phonon, energetic) properties of some strategically important minerals for structural ceramics, biomedical and petrological applications. These properties affect the thermodynamic stability and rule the mineral-environment interface phenomena, with important economical, (bio)technological, petrological and environmental implications. The minerals of interest belong to the family of phyllosilicates (talc, pyrophyllite and muscovite) and apatite (OHAp), chosen for their importance in industrial and bi

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Adjei-Duodu, Thomas. "Physical, chemical and functional properties of tiger nuts (Cyperus esculentus) selected from Ghana, Cameroon and UK market (Spain)." Thesis, University of Plymouth, 2015. http://hdl.handle.net/10026.1/3313.

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The tiger nut (Cyperus esculentus) has attracted a lot of unsubstantiated health claims, yet there is a dearth of research investigation within Ghana specifically in the area of food product development. This study addresses the development of ‘functional bread and biscuit’ from tiger nuts obtained from UK market (Spain). The chemical constituents; carbohydrate, lipid, protein, dietary minerals and antioxidants, the functional properties of three varieties of tiger nuts obtained from Ghana (black and brown), Cameroon (yellow) and UK market (Spain) (brown) were investigated using standard analy

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Greene, Robert Crandall. "The separation of copper sulfide ore minerals from gangue using magnetic nanoparticles functionalized with peptides selected via phage display : a proof of concept." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/61528.

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The full abstract for this thesis is available in the body of the thesis, and will be available when the embargo expires.<br>Applied Science, Faculty of<br>Mining Engineering, Keevil Institute of<br>Graduate

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Hamdadou, Mohammed. "Caractérisation pétro-minéralogique et séquentielle du gisement de phosphate de Djebel Onk (Algérie) : quantification et répartition de l'exo- et endogangue : approche nouvelle du traitement." Vandoeuvre-les-Nancy, INPL, 1996. http://www.theses.fr/1996INPL064N.

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Géologie. Au sein de la série phosphatée de Djebel Onk, la formation de Djemidjema correspond en partie à une puissante couche phosphatée de 30 à 35 mètres d'épaisseur sans intercalations stériles. L’analyse séquentielle et l'étude géochimique confirment que les modes granulométriques sont caractéristiques de deux populations de grains phosphates allochtones provenant de deux milieux de genèse différents. La dérive mégaséquentielle granulométrique met en évidence deux mégaséquences d'échelon 4: la mégaséquence A (phosphate à grains fins avec exogangue argilo-carbonatée) ; la mégaséquence B (ph

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Sturdy, Joline. "Accounting and taxation practices of selected mining exploration companies in South Africa." Thesis, 2011. http://hdl.handle.net/10500/4909.

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The promulgation of the Mineral and Petroleum Resources Development Act 28 of 2002 (MPRDA) led to a significant increase in the number of junior exploration companies. In this regard, International Financial Reporting Standard (IFRS) 6 allows companies to develop their own accounting policies for exploration and evaluation expenditure. However, there is no definition of either prospecting or exploration in the Income Tax Act 58 of 1962 (Income Tax Act). The objective of this study was to perform a literature review and to carry out empirical research by using questionnaires that were di

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Letsoalo, Katlego Masilu. "Comparison of value at risk models and expected shortfall models for selected mineral commodities." Thesis, 2020. https://hdl.handle.net/10539/31130.

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A research report submitted to the Faculty of Engineering and the Built Environment, University of the Witwatersrand, in partial fulfilment of the requirements for the degree of Master of Science in Engineering, 2020<br>Risk management is a critical component of modern-day finance with the banking sector having led the developments over the years. Following the impacts of the Global Financial Crisis of mid-2008 on various markets, investors are more concerned with their overall risk exposure including mining companies. Literature presents Value at Risk (VaR) and Expected Shortfa

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"Effects of mining activities on selected aquatic organisms." Thesis, 2012. http://hdl.handle.net/10210/5457.

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Ph.D.<br>Except for agriculture, the mining industry is considered as not only the oldest but also the most important industry. Mining involves the removal of minerals from the earth's crust for usage by mankind. The disturbance during mining activities such as mining effluent has an effect on the natural aquatic environment. In any freshwater environment, the macroinvertebrates form a vital link between the abiotic envinronment and the organisms in higher trophic levels. It is thus true that specific environmental contaminants, such as mining effluent, may directly affect the survival of maco

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Šimečková, Jana. "Vliv některých organických hnojiv a minerálního hnojiva na vybrané půdní parametry =:Influence of some organic fertilizers and mineral fertilizer on selected soil parameters /." Doctoral thesis, 2019. http://www.nusl.cz/ntk/nusl-426257.

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The search for new sources of electrical energy has influenced among others agricultural practice too. The fermentation process of biogas plants requires the adjustment of crop rotation to ensure sufficient input material throughout the year in the same composition, e.g. corn silage. The by-product, digestate, is applied to agricultural land as an organic fertilizer. However, the effect of its long-term application on soil properties is not explained. In a field trial in Vatín (soil type cambisol modal), the effect of application of digestate, mineral fertilizer and farmyard manure (150 kg.ha-

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Downes, Peter M. "Sulfur- and lead-isotope signatures of selected middle Silurian to Carboniferous mineral systems of the Lachlan Orogen, eastern New South Wales - implications for metallogenesis." Thesis, 2009. http://hdl.handle.net/1959.13/916207.

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Research Doctorate - Doctor of Philosophy (PhD)<br>Sulfur- and lead-isotope signatures for 64 deposits/systems located in the Central and Easternn Subprovinces of the Lachlan Orogen in eastern New South Wales were characterised in the present study. Here are presented four new ⁴⁰Ar/³⁹Ar dates, 644 new sulfur- and 105 new leadisotope analyses, plus a collation of 386 unpublished and 277 published sulfur isotope and over 560 unpublished and published lead isotope analyses for middle Silurian to Early Carboniferous mineralisation. Measured δ³⁴S values for 22 VHMS deposits range between -7.4‰ to 3

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Gumede, Sabelo Victor. "Assessment and management of the impact of platinum mining on water quality and selected aquatic organisms in the Hex River, Rustenburg Region, South Africa." Thesis, 2012. http://hdl.handle.net/10210/8062.

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Ph.D.<br>Mining operations significantly influence the environment due to direct and indirect discharges of waste products into the aquatic systems. The primary aim of this study was to assess the current situation in the platinum mining area and develop a management plan to ensure that existing and potential environmental impacts caused by platinum mining and processing are mitigated. To do this, an assessment was carried out to investigate changes in critical aquatic invertebrate and fish community distributions and assess how they relate to measured environmental factors. Five sites were se

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Henri, Aidan Jean. "The effect of acid mine drainage on the hatching success of branchiopod crustaceans from selected South African pans." Thesis, 2014. http://hdl.handle.net/10210/11357.

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M.Sc. (Zoology)<br>Pans are endorheic wetlands, and are abundant in South Africa in a band from the western Free State into Mpumalanga. The pan environment experiences daily and seasonal fluctuations in physico-chemical conditions. The physico-chemical variables are influenced by the local climatological and hydrological conditions, and are all inter-related. An imbalance of one variable can have countless effects on the others. The physico-chemical composition of the water ultimately determines the existence of the biota in such wetlands. Branchiopod crustaceans are a unique group of fauna wh

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Sigxashe, Sibulele. "Evaluation of strategies for rehabilitation of selected abandoned/historic mine sites in the Giyani Greenstone Belt, Limpopo Province of South Africa." Diss., 2020. http://hdl.handle.net/11602/1547.

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MENVSC<br>Department of Ecology and Resource Management<br>Mining has historically been the mainstay of the South African economy and has both shaped its social and environmental fabric. However, it has left the country with a negative legacy of abandoned mines that present environmental problems, and public health and safety concerns. The common physical and environmental problems of most of these abandoned mines are associated with open shafts, unstable slopes of waste dumps and pits, and dilapidated mine infrastructure. Even though the problems of these abandoned mines are known, little has

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Rembuluwani, Ndivhudzanyi. "Development of an integrated approach of dealing with challenges of selected small-scale rock aggregate mines in Vhembe District, Limpopo Province, South Africa." Diss., 2016. http://hdl.handle.net/11602/829.

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Herwig, Sasha. "The role of hydrogen in selected oxysalt minerals." 2009. http://hdl.handle.net/1993/21503.

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"Arsenic uptake and speciation in selected sulfate and phosphate minerals." Thesis, 2014. http://hdl.handle.net/10388/ETD-2014-02-1437.

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Widespread arsenic contamination with adverse effects to human health is a global problem. Most previous studies on arsenic contamination in natural environments and those associated with mining and agricultural activities focused largely on arsenic-rich minerals such as arsenates, arsenites, sulfarsenides, and sulfides. Rock-forming minerals generally contain only minor or trace amounts of arsenic but, owing to their sheer abundances, are potentially important (and sometimes dominant) sources of this metalloid and can play significant roles in the attenuation and sequestration of arsenic in v

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Crane, Martin J. "Geochemical studies of selected base metal minerals from the supergene zone." Thesis, 2001. http://handle.uws.edu.au:8081/1959.7/232.

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Acid leaching of different natural chrysocolla samples under ambient conditions demonstrated that the chemical and chrystallographic inhomogenity significantly affects the rate and that it is virtually impossible to use the mineral as a model for the kinetics of hydrometallurgical processing of copper ores.Dissolution experiments, stability diagrams,and X-ray powder diffraction studies are undertaken and studied in this research and results are given.It is found that a complete solid solution series exists in Nature with most tungstenian wulfenites and molybdenum stolzites containing a range o

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Entesari, Alireza. "A study of selected industrial minerals for water treatment and supplementary cementing materials." Thesis, 2005. http://hdl.handle.net/2429/16310.

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A study was conducted on three natural mineral materials referred to as basalt, scoria, and calcined shale. These materials were provided by an industrial mineral producer in British Columbia. The main objectives of this study are, to evaluate the selected materials for treatment of metal contaminated effluents by adsorption, and to assess the possibility of replacing cement with the materials and to evaluate the performance of the cement replaced mortars. In this research study, adsorption tests were conducted to asses the possibility of removing cationic and anionic metal ions from prepared

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Ekosse, Ekosse Georges-Ivo. "Characterization and an investigation on ceramic properties of selected continental clay materials." Thesis, 2014. http://hdl.handle.net/10210/10876.

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Willis, Kirsten. "An investigation of the effects of fulvic and humic acids on the absorption of selected drugs, vitamins and minerals using the everted mouse gut model." Diss., 2015. http://hdl.handle.net/2263/46044.

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Humic substances, such as the closely related humic and fulvic acids are ubiquitous, naturally occurring organic macromolecules of complex but undefined structure. These compounds are known complexing agents due to their supramolecular like structures and are capable of binding a wide variety of compounds. Numerous studies have confirmed that humic and fulvic acids exhibit diverse medicinal and therapeutic properties. For this reason, alternative or “natural” medicinal preparations rich in these substances are being self-administered, often concomitantly with conventional drugs. The possibili

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Chang, Rung-Rung, and 張容蓉. "Influences of the chemical structures of humic substances (HS) extracted from a volcanic soil on the sorption of HS by selected clay minerals and Fe(oxy)hydroxides." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/82988223459083694521.

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博士<br>國立中興大學<br>土壤環境科學系所<br>102<br>Most studies of humic substances (HSs) been carried out on extracts of soils in dilute sodium hydroxide solutions, i.e., the isolation of the International Humic Substances Society (IHSS). However, humin, is insoluble in aqueous base. Recently, a sequential exhaustive extraction (SEE) process has been shown to be capable of isolating and separating the major components of the classically defined HSs from soils of the temperate and tropical regions. The SEE system was used to isolate the HA/FA and humin fractions from a subtropical volcanic Taiwanese soil. Inc

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