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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 28 for “"Flame ionization detector"”.
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Development and experimental analysis of a micro-flame ionization detector for portable gas chromatographs
… has been developed that utilized a diffusion flame encased in a micro-fabricated SOI structure. The micro-flame was fueled by a portable electrolyzer that provided the hydrogen and oxygen flow rates necessary for the device operation. The micro-FID was able to detect organic analytes with …
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The application of gas-liquid chromatography to the structural investigation of Polysaccharides
… by gas-liquid chromatography, using the hydrogen-flame ionization detector. The conditions used compared favourably with conditions reported by other workers and were well suited to the quantitative analysis of methanolysis products from methylated polysaccharides. Excellent separations were …
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Motion sensitivity of flame ionization detectors
A portable gas chromatograph, using a single flame ionization detector, was constructed. The unit was tested for response to surge, sway and heave accelerations up to 0.3g. Also the detector's response was studied for roll and pitch up to 25 degrees with periods ranging from 3 to 20 seconds. The …
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An explosive vapor generator based on capillary gas chromatography
… The design of the vapor generator replaces a flame ionization detector on the gas chromatograph with an effluent heater system to provide a cloud of explosive vapor while preventing condensation onto the walls of the capillary column. This vapor source has been successfully used to produce …
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The terpenes of Virginia pine (<u>Pinus virginiana mill</u>.), with investigations of their attractancy to the southern pine beetle (<u>Dendroctonus frontalis</u> zimm.)
A gas chromatograph, equipped with a flame ionization detector, was used to qualitatively and quantitatively analyze the monoterpenes of Virginia pine. The instrument was adjusted for optimum performance prior to sample analysis. Two packed columns with stationary phases of different polarity, …
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Development of a micro-FID using a diffusion flame
A micro-flame ionization detector (micro-FID) was developed operating with a diffusion flame with a folded flame structure. Unlike conventional FIDs, an air-hydrogen diffusion flame was developed and tested in an encapsulated structure of Quartz-Macor®-Quartz layers. Diffusion flames are generally …
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Zebra GC: A Fully Integrated Micro Gas Chromatography System
… column with on-chip thermal conductivity detector (microSC-TCD), the flow controller unit, and all the necessary flow and thermal management as well as user interface circuitry are integrated to realize the fully functional microGC system. The work reports extensive characterization of …
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Determination of volatile nitrosamines in foods and other environmental samples
… with the Coulson electrolytic conductivity detector operated in the pyrolytic mode and with a flame ionization detector. The sensitivities of these detectors were compared for selected alkyl and heterocyclic nitrosamines. The specificity of the Coulson detector was demonstrated for analysis …
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Detection of secondary flow in a turbine cascade using a tracer gas technique
… determined at two downstream locations using a flame ionization detector. It was found that the pressure-side leg of the horseshoe vortex moved toward the suction side of the passage, starting the formation of the passage vortex, and was distributed throughout the passage vortex. The …
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Hepatic microsomal and peroxisomal docosahexaenoate biosynthesis during piglet development
… fatty acid was detemiined by gas chromatograph-flame ionization detector (GC-FID) and synthesis of each fatty acid was calculated for a 30-minute period. Synthesis of DHA was not detected in fetal liver. The data suggests that DHA in the fetus is probably supplied from maternal sources through …
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Supercritical Water desulfurization of crude oil
… gas chromatography (GCxGC) coupled with two detectors, sulfur chemiluminescence detector (SCD) and a flame ionization detector (FID). SCD is a sulfur specific detector that allowed detailed analysis of the reactions that occur during SCW treatment of real fuel mixtures. It was shown that SCW …
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Cold start fuel management of port-fuel-injected internal combustion engines
… cycle's charge mass and EOHC emissions. The fast flame ionization detector is employed to measure both in-cylinder and engine out hydrocarbon concentrations for various cold start strategies. The manufacturer's original fueling strategy is used as a starting point and is compared to a "in-cylinder …
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Residual Diesel Range Organics and Selected Frothers in Process Waters from Fine Coal Flotation
… using gas chromatography equipped with either a flame ionization detector (GC-FID) or a mass spectrometer (GC-MS). Samples are subjected to a variety of test conditions in order to understand the behavior of diesel compounds in coal processing streams. Results show that frother and collector …
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Design, construction and commissioning of a packed bed reactor system for methane to methanol conversion
… reaction products using gas chromatography with flame ionization detector in conjunction with an oxidizer-methanizer microreactor is developed which is capable of quantifying minor carbon containing reaction products formed at low conversions with yields greater than 10 μmol/mol. Flow, pressure …
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Supercritical Fluid Extraction and Chromatography of Various Lipids from Soybean Lecithin
… coupled with ultraviolet, refractive index, flame ionization detector, and mass spectrometry (MS) detection have long been used in the study of phospholipids. These methods were time-consuming and lacked quantitative accuracy. In this work, phosphatidylcholine, phosphatidyl-ethanolamine, …
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Synthesis, Characterization and Activity of Palladium Catalysts on the Dual Support of Cerium and Aluminum Oxides
… measured by a gas chromatograph fitted with a flame ionization detector and a ‘Carbon Plot’ column. Palladium was present as PdO and PdOx x>2+ and cerium as CeOx (+3 and +4 oxidation states) as per XPS analysis. The activity of the Pd/cerium oxides-alumina500C catalyst was higher than the …
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Estudio analítico de compuestos volátiles en vino: caracterización quimiométrica de distintas denominaciones de origen
… mode coupled with gas-chromatography (CG) and a flame ionization detector (FID) is selected as a rapid method for the analysis of volatile compounds from wine samples . The optimised method was successfully applied to the analysis of wine samples from five Denomination of Origin ( Rioja, Navarra, …
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Analysis and Treatment of Emerging Polar Contaminants
… system, hyphenated to a universal gas phase detector, flame ionization detector (FID), was designed. By using pure subcritical water as a mobile phase, temperature was used to control chromatographic retention. This instrument may be used for rapid screening of environmental samples with …
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Elementary, pressure dependent model for combustion of C1, C2 and nitrogen containing hydrocarbons : operation of a pilot scale incinerator and model comparison
… In addition, two gas chromatographs with flame ionization detector are used to determine CH4, C2H2 + C2H4 and total hydrocarbon concentrations. Typical operating conditions are at an average 02 concentration of 6 - 8 %. The NO concentration ranged from 100 - 200 ppm. Approximately I ppm of …
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Exploring the Surface Liquid and Lake Regions of Titan with Laboratory Experimentation and Cassini Spacecraft Data
… using a gas chromatograph fitted with a flame ionization detector. The infrared (IR) spectra of liquid and ice constituents are analyzed with a Fourier transform infrared spectroscopy spectrometer (FTIR) via a fiber optic probe, and all pertinent data is logged in a computer.</p> <p>With …
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