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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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A Critique on Methods of Determining Free Iron Oxides Employing Podzolic Soils from Thor Lake, North West TerritoriesBirnie , Stuart Alistair 05 1900 (has links)
<p> The study of free iron oxides in soils has for many years been an important area of research in the soil science. The development of many standard procedures over the years has free iron oxides. This study presents a systematic review of {a) the development of chemical processes and iron deposits in the podzolic group of soils, a major Canadian soil group in which free iron oxides deposits are found; {b) a review of the theory and experimental data behind some of the most widely accepted procedures of iron extraction; (c) a systematic review of four of the major methods of free iron extraction through experimental and statistical analysis employing soil samples from Thor Lake, N.W.T. The results of this study show that the most useful method for free iron oxide extraction is one that is independent of complexing variables such as pH, C.E.C., temperature and time.<p> / Thesis / Bachelor of Arts (BA)
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Infra-Red Spectrophotometry and X-Ray Diffractometry as Tools in the Study of Nickel LateritesAzevedo, Luiz Otavio Roffee January 1985 (has links)
Nickel silicate laterite deposits developed on ultra-mafic rocks are similar in many general respects but they vary considerably in detail. The mineralogy of these surficial deposits is very complex and difficult to determine because of the fine grained nature and solid solution characteristics of the hydrous secondary minerals and because many of the phases are actually mineraloids that are poorly ordered or amorphous. To try some new approaches toward clarification of these phases, 24 samples from New Caledonia and Puerto Rico ranging from the ophiolite-ultramafic olivine-pyroxene-chromite-serpentine substrate rocks upward through intermediate phases of weathering to the final oxide -hydroxide iron cap phase were analyzed with the infrared spectrophotometer (IR -10) and with the automated X –ray diffractometer. Four limonite samples were also mineralogically analyzed. Goethite, secondary quartz, cryptomelane, hematite, chromite, talc, thuringite, and garnierite have been identified in various samples as weathering profile products.
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