Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 33 for “"Gas Chromatography Mass Spectroscopy"”.
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Analysis of wood pulp extracts utilizing gas chromatography-mass spectroscopy
Wood pulp mill effluents continue to attract much attention due to environmental consequences. However, in comparison, very little work has been published on wood pulp extracts themselves. In this investigation, chemithermomechanical (CTMP) pulps as well as Kraft (BKP) pulps were Soxhlet extracted …
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Comparison of Artificial Flavors in Commercial Products and Actual Natural Flavor via Gas Chromatography Mass Spectroscopy Data.
… from different local sources were profiled by gas chromatography-mass spectroscopy (GCMS). These profiles were then used as a reference to compare GCMS profiles of commercial artificial strawberry flavor products such as strawberry flavored Cool Splashers™, Gatorade®, and Aquacal® flavored …
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Analysis of Kyrock for Leaching of Impurities in Synthetic Rainwater
… of the samples using inductively coupled plasma spectroscopy showed inorganic compounds such as titanium oxide, vanadium oxide along with traces of arsenic. Elemental analysis of samples indicates a percent of carbon, and sulfur with no notable traces of nitrogen. Pyrolysis of the samples was …
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A Chemical Pathway to the Formation of Chlorinated Compounds During Combustion
… and the products were trapped and analyzed by gas chromatography/mass spectroscopy. It was shown that the Deacon reaction was favored at higher temperatures. The chlorination of phenol in vapor phase was found to begin at temperatures as low as 250°C and to be favored at higher temperatures. …
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Sensorial characteristics of odour active compounds from raw natural rubber
… and carried through to the final dried products. Gas chromatography-mass spectroscopy (GC-MS) and gas chromatography-sulfur chemiluminescence detector/nitrogen chemiluminescence detector (GC-SCD/NCD) incorporated with several pre-concentration methods were initially used to evaluated analytical …
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Stable isotope probing of hyperthermophilic filamentous microbial communities in Octopus Spring, Yellowstone National Park
… Octopus Spring in Yellowstone National Park. Biomass was removed from the outflow stream and incubated at near-in situ conditions with labeled bicarbonate, formate, or acetate. Lipids from the biomass were extracted and analyzed using gas chromatography-mass spectroscopy (GC-MS) and gas …
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Characterization of human expired breath by solid phase microextraction and analysis using gas chromatography-mass spectrometry and differential mobility spectrometry
… of human expired breath was developed using gas chromatography-mass spectroscopy. It was subsequently adopted for gas chromatography-differential mobility spectroscopy, a modality not previously applied to this problem. Tedlar bags and solid-phase microextraction were used for breath sampling …
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Synthesis And Polymerization Of Bifunctional Five-membered Cyclic Dithiocarbonates And Their Use As Stabilizers For Magnetic Nan
… and carbon nuclear magnetic resonance (NMR) spectroscopy, gas chromatography-mass spectroscopy, and Fourier transmission infrared (FTIR) spectroscopy. The polyaddition polymerization of 1,3-oxathiolane-2-thione with 1,4-diaminobutane at room temperature resulted in a poly(thiourethane) …
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In situ sintering study of model nickel catalysts
… The development of analytical techniques such as gas chromatography mass spectroscopy (GCMS) and liquid chromatography mass spectroscopy (LC-MS) has become popular as metabolomics tools in the study of such catabolic pathways. The development of biomarkers and internal standards to perform …
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Synthesis and evaluation of flouro and thia lipids as bioanalytical tools
… The development of analytical techniques such as gas chromatography mass spectroscopy (GCMS) and liquid chromatography mass spectroscopy (LC-MS) has become popular as metabolomics tools in the study of such catabolic pathways. The development of biomarkers and internal standards to perform …
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Chemical Vapor Etching of Copper Using Oxygen and Various Beta-Diketones
… stream of the reactor and analyzing them using gas chromatography/mass spectroscopy. Etch rates over 1.5 mum/min were achieved at substrate temperature of 350°C using 200 Torr of O 2 and 50 Torr of hexafluoropentanedione. The degree of surface contamination was found to be a functions of the …
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Chemical characterization and aquatic biotoxicity testing of dye wastewaters and their reduction products
… composition analysis, high performance liquid chromatography (HPLC), gas chromatography/mass spectroscopy (GC/MS), and nuclear magnetic resonance spectroscopy (NMR). The toxicity of this purified compound was measured with Microtox and Daphnia pulex tests. Microtox tests were also performed on …
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Study of Neem bark tannins for the leather industry
… was found to be 1550 by gel permeation chromatography. Gas chromatography-mass spectroscopy demonstrated the complex nature of NBT molecular masses consist of monomeric, dimeric and trimeric units of procyanidin B and C types respectively. IR and FT-IR spectroscopy results were …
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Air-gap sacrificial materials by initiated chemical vapor deposition
… was similar to published data. Flash pyrolysis gas chromatography mass spectroscopy analysis showed that the products of thermal decomposition are monomers, rearranged small molecules and low oligomers. The modulus and the hardness were in the range of 3.9 to 5.5 GPa and 0.38 to 0.75 GPa, …
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Flat Plate Boundary Layer Flows Over Catalytic Surfaces for Micro-Combustion Applications
… with infrared thermography and was correlated to gaseous reactant concentration profiles that were acquired with gas chromatography/mass spectroscopy and Raman spectroscopy. Additionally, Particle Image Velocimitry was used in order to investigate the streamwise and transverse velocity profiles …
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Insecticidal and repellant activities of selected botanical extracts against rice weevil (Sitophilus oryzae L.)
… toxicity and phytochemical composition using gas chromatography-mass spectroscopy (GC-MS). Results showed that acetone and ethanol extracts of the three plants exerted dose-dependent repellence and time-dependent contact toxicities. Ethanol extracts of the three plants showed superior …
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Allelopathic effect of imperata cylindrica (L.) beauv. extracts on the germination of weeds
… and extreme competitiveness. While the gas chromatography-mass spectroscopy analysis (GC�MS) of active fractions revealed the presence of allelochemicals including phenolic acid, fatty acids, and organosilicon compounds. Although phenolic acids [butyl phenol, phenyl 3-methylbut-2-enoate, …
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Production and characterization of composite nano/micro sized particles by rapid expansion of supercritical solutions (ress) co-precipitation
… composite particles is in the range 70-73% by mass as determined by Gas Chromatography-Mass Spectroscopy (GC-MS) and by XRPD. Micronized composites of ibuprofen and bio-compatible polymer binders were produced by co-precipitation in rapid expansion of binary supercritical solutions (RESS). The …
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The analysis of organic matter in oil-shales
… 13C nuclear magnetic resonance, gel-permeationchromatography, gas chromatography-mass spectroscopy, fourier transform infra-red spectroscopy and some ultra violet-visible spectroscopy.
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