Gas chromatography

    Page 1 of 50 - About 500 Essays
  • Gas Chromatography Essay

    Chromatography is a separation method used to help identify mixtures. One common form of chromatography is gas chromatography. This type of chromatography will usually use a gas as the mobile phase, and a liquid as the stationary phase (“Gas Chromatography”). A gas chromatograph is comprised of some vital components, which include: the carrier gas, flow controller, injector port, column, column oven, detector, and recorder (“Gas Chromatography”). The purpose of this lab was for an unknown accelerant to be identified using GCMS. Though this was not possible as the GCMS was not available. Instead, data samples were given for the use of determining the unknown accelerant. Methods Though the GCMS instrument was not used, there are procedures which…

    Words: 940 - Pages: 4
  • Gas Chromatography Research Paper

    Part A Gas Chromatography What is it? Gas chromatography is a variation of chromatography used in analytical chemistry for separating and analysing components that can be vaporised without decomposition ("Gas Chromatography", 2016). This technique involves using a gas as the mobile phase. There are two types of gas chromatography: • Gas-solid chromatography – separates substances on the basis of their different strengths of adsorption on the solid • Gas-liquid chromatography – separates…

    Words: 2119 - Pages: 9
  • Gas Chromatography Lab

    Introduction: The main purpose of this experiment was to take the Gas Chromatography/ Mass Spectrum part of the “Analysis of US bills for cocaine using gas chromatography / mass spectrometry” lab and improve upon the gas chromatographic results. This would be done by finding a way to separate the peaks of cocaine and doxepin. The lab done previously showed the use of two different methods to obtain samples of cocaine and doxepin for spiked dollar bills. The two extraction methods were…

    Words: 1038 - Pages: 5
  • Lab Report Gas Chromatography

    Gas chromatography (GC) is a chromatography technique where the separation of individual components (called analytes) from a sample relies on their differing distribution between the mobile phase and a stationary phase. The mobile phase is what carries the analyte (components being analysed) through the stationary phase and in GC, it is an inert gas, (usually helium or nitrogen). The gas must be inert so it will not react with the samples to give a false reading. The stationary phase is the…

    Words: 1375 - Pages: 6
  • Gas Chromatography Lab Report Essay

    Previously, for the first part of the experiment, it was hypothesized that the retention times of the eluates were invariably associated with the polarity of the compound; the more non-polar the compound, the faster it would be eluted out of the gas chromatogram. It was also hypothesized that the retention times decreased as the temperature in the gas column increased. In the first part of the experiment the relationship between the temperature and retention time, and the non-polarity of the…

    Words: 1141 - Pages: 5
  • Gas Chromatography Method

    Several methods have been described in the literature for the determination of MNT in its pharmaceutical dosage forms or in biological samples. Examples of these methods in biological samples are gas chromatography – mass spectrometry (GC-MS) [18] in plasma and urine of rats and human while GC-FID [19] was used for MNT analysis in human urine. Also, MNT in mixture with other drugs have been assayed in human plasma using GC-FID [20]. In pharmaceutical preparations, MNT has been assayed using HPLC…

    Words: 945 - Pages: 4
  • Fractional Distillation And Gas Chromatography Lab Report

    DISTILLATION The purpose of experiment 1, fractional distillation and gas chromatography, was to separate an unknown organic mixture into two liquids. The primary process of separation was fractional distillation, which utilizes the physical properties of the two unknown volatile liquids. Once the unknown mixture was successfully fractioned, gas chromatography was used to help determine the identity of the two unknown liquids. Fractional distillation and simple distillation both take advantage…

    Words: 1163 - Pages: 5
  • Dissolved Gas Analysis Essay

    1.0 REFERENCES 1.1 Sample Preparation and Calculations for Dissolved Gas Analysis in Water Samples Using a GC Headspace Equilibration Technique, EPA National Risk Management Research Laboratory, RSKSOP-175, Rev.2, May 2004. 1.2 Light Hydrocarbons in Aqueous Samples via Headspace and Gas Chromatography with Flame Ionization Detection (GC/FID), Pennsylvania Department of Environmental Protection Bureau of Laboratories, PA-DEP 3686, Rev.0, April 2012. 1.3 Lange’s Handbook of Chemistry, 14th edition…

    Words: 1252 - Pages: 5
  • Female Sprague

    The liquid chromatography was performed using an Acquity UPLC® system (Waters Corp., Milford, MA, USA) coupled to a mass spectrometer (Xevo TQ-S, Waters Corp.). The bioanalytical method for the simultaneous quantitation of the three PFCs was optimized through the various mobile phase conditions and sample preparation processes. A 3 µL aliquot of each sample was injected into a Kinetex® 2.6 µm C8 100 Å column (2.1 mm × 100 mm, 2.7 µm particle size, Phenomenex, Inc., USA) with a column…

    Words: 937 - Pages: 4
  • Cyclohexanol Lab Report

    Based on the data presented in the Data Set A chromatographic separation, can you explain why there is such a steep decline in column efficiency with temperature change? As the temperature is increasing, the equilibrium partitioning of the sample with the stationary phase will not be established. Then, the components of the mixture may elute together or be incompletely separated. To sum up, as the temperature increases, the number of theoretical plates decreases, the efficiency decreases. 6-19…

    Words: 786 - Pages: 4
  • Previous
    Page 1 2 3 4 5 6 7 8 9 50

Related Topics:

Popular Topics: