Gas Chromatography by juanagao

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									Schuyler Mincemoyer

                                                          Gas Chromatography

                                                                Block Diagram


      Carrier             Flow               Sample              Column              Detector            Data
      Gas Tank            Regulators         Injection Spot                                              System

                                                              Oven (temperature controlled)
                                                                                                         Display of
                                                                                                         Graph


Carrier Gas Supply: A chemically inert gas to prevent cross reactions which serves as the mobile phase of the reaction. Examples
include argon, nitrogen, hydrogen, and helium.
Flow Regulators: Is used to measure precise amounts of pressure that will be used to run the instrument.
Oven: This contains the injector, the column, and the detector. It contains a thermostat because the temperature must be controlled at
all times to obtain accurate and precise readings.
Sample Injection Spot: The injector volatizes the sample because it must be in the form of a vapor or gas to continue through the
analysis.
Column: The sample runs through either a capillary or packed column. Capillary columns are more frequently used as their
diameter is a few nanometers. This allows the column to be coiled and provides a larger distance for the sample to travel.
Detector: This determines what components make up the sample you injected earlier. There are many different kinds, all of which
have their own strengths and weaknesses.
Data System: Where the Data is collected and gathered to generate a easy to read analysis.
Display of Graph: A visual representation of the data on a monitor.
                                                              Vendors:

Alltech, PerkinElmer, Hewlett-Packard, Shimadzu, Thermo Electron Corporation, and Varian Inc.

       *The most expensive gas chromatography instrument I could find was the Hewlett Packard 6890 Series II Plus Gas
Chromatograph with HP 7673 Auto Sampler, GC #5. It costs $12,500 on Ebay.

            *The least expensive one was the HP 5890 Series II GC Gas Chromatograph which costs $3,000. It was a pretty old model.

                                                      Articles using Gas Chromatography

      1.      Coupling a High-Temperature Catalytic Oxidation Total Organic Carbon Analyzer to an Isotope Ratio Mass Spectrometer
              To Measure Natural-Abundance δ13C-Dissolved Organic Carbon in Marine and Freshwater Samples
              Robert J. Panetta, Mina Ibrahim and Yves G lina
              Analytical Chemistry., 2008, 80 (13), pp 5232–5239

      2.A New Technology for Producing Hydrogen and Adjustable Ratio Syngas from Coke Oven Gas
       Jun Shen and Zhi-zhong Wang, Huai-wang Yang and Run-sheng Yao
  wwwwwEnergy Fuels, 2007, 21 (6), pp 3588–3592

      3.      Temperature-Induced Inversion of the Elution Order of Enantiomers in Gas Chromatography: N-Ethoxycarbonyl
              Propylamides and N-Trifluoroacetyl Ethyl Esters of α-Amino Acids on Chirasil-Val-C11 and Chirasil-Dex Stationary
              Phases
              Pavel A. Levkin,, Anna Levkina,, Harri Czesla, and, Volker Schurig
              Analytical Chemistry 2007 79 (12), 4401-4409

                                                     Everyday uses for Gas Chromatography
 1.        It could be used in a Environmental lab to test for environmental contaminant such as fertilizers and their contents.
 2.        It could be used nutritionally to test all the for the parts listed on nutrition labels though separating each part of the food.

								
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