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Showing 1 to 20 of 372 for “"Trace elements"”.
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Studies of trace elements in sediments
Thesis. (Ph.D.) Massachusetts Institute of Technology. Dept. of Geology and Geophysics, 1954.
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Halogens and trace elements in subduction zones
… and incorporation mechanisms of halogens and trace elements in minerals and aqueous fluids at high temperatures and pressures. The solubility of fluorine and chlorine in upper mantle minerals (forsterite, enstatite and pyrope) and halogen partitioning between aqueous fluids and these minerals …
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Transformation of iron and trace elements during coal combustion
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.
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Environmental Toxins and Essential Trace Elements at Delivery and ADHD
Perfluorinated compounds (PFCs), phthalates, manganese and selenium are ubiquitous in the environment and humans and influence fetal growth and development. Register and biobank based case-control studies were conducted to investigate the relationship between prenatal exposure to these chemicals …
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Selected Trace Elements of the White Pine Group, Eastern Nevada
Made available in DSpace on 2014-12-04T19:14:24Z (GMT). No. of bitstreams: 1 6305122.pdf: 2654221 bytes, checksum: 243a697e568353166d9d734ace38a9f5 (MD5) Previous issue date: 1963
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Foraminiferal trace elements : uptake, diagenesis, and 100 m.y. paleochemical history
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1983.
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Behavior of trace elements in rock weathering and soil formation
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1958.
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Distribution of trace elements in olivines and proxenes - an experimental study
… system anorthite-forsterite-silica to which trace amounts of the transition metal ions Cr³⁺, Fe²⁺, Mn²⁺, Co²⁺, Ni²⁺, and Cu²⁺ had been added. The resulting concentrations of the transition metal ions in the liquid and crystalline phases were determined using the electron microprobe. The …
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Variations in Mineralogy and Trace Elements, Esopus Formation, Kingston, New York
Made available in DSpace on 2014-12-04T19:14:25Z (GMT). No. of bitstreams: 1 6402882.pdf: 3560941 bytes, checksum: 88a2ff5d8881704367711ce75940b259 (MD5) Previous issue date: 1963
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Determination of trace elements in hair for monitoring environmental and occupational exposure
… as an indicator of the intake and exposure to trace elements. While the analysis of these conventional sample types can only be used as a measure of recent exposure, hair, in contrast, can provide an historical record of exposure episodes. Furthermore the levels of trace elements in hair are …
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Characterization of trace elements in a petrified wood material for provenience studies
Includes bibliographical references (pages 78-83).
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Time-series trends of trace elements in an ice core from Antarctica
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1995.
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Removal of trace elements from coal using a multiple-property processing circuit
… to assess the potential health risks of trace elements released during coal combustion. Several trace elements in coal associate with the mineral matter while others associate with pyrite. Researchers at the Virginia Center for Coal and Minerals Processing have developed a …
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Determination of trace elements in crude oils by ICP-MS using detergent microemulsion.
… recoveries ranged from 100.1% to 119.9 % for all elements and 85.1 % for Cr in Used Oil HU-1 and from 84.8 % to 100.1 % for all elements and 79.1 % for Cr in 1084a NIST. The precision of the method was < 5% for all elements, except for Cr which was 30.9 %. The limits of detection based on 3 times …
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Mass Balance of Major, Minor and Trace Elements During AFBC Combustion of Fuels
… the determination of 13 major and minor., and 11 trace elements, in solid coal and coke combustion residues by inductively coupled plasma-atomic emission spectrometry (ICP-AES) were checked for routine use. In this study, the ICP analysis values and XRF analysis values of major and minor elements …
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Trace elements in marine biogenic carbonates: analysis and application to past ocean chemistry
Trace elements in marine biogenic carbonates may be used as proxies for past ocean<br/>chemistry provided that there is an established relationship between the trace element<br/>proxy and a parameter of interest, this relationship is preserved within biogenic<br/>carbonate, and the trace element …
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The distribution and speciation of trace elements in bovine ovaries using synchrotron techniques
When studying the relationship of trace elements with human health, it becomes increasingly evident that keeping a balanced level of minerals in every cell of the human body may be crucial to optimising health and preventing disease. Dietary deficiencies of trace elements have been reported to …
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Interactions between aqueous fluids and silicate melts : equilibration, partitioning and complexation of trace elements
… melts is closely linked to a fractionation of elements between the two phases. Then, aqueous fluids migrate to shallower parts of the Earth ́s crust because of it ́s lower density compared to that of melts and adjacent rocks. This process separates fluids and melts, and furthermore, during the …
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