Gas Chromatography Instrumentation
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Questions and Answers

What is the typical internal diameter range of a capillary column in gas chromatography?

  • 0.1 - 0.53 cm
  • 0.1 - 0.53 mm (correct)
  • 0.1 - 0.5 cm
  • 0.1 - 0.5 mm

    • Which chemical compound is commonly analyzed using a DB-5MS stationary phase in gas chromatography?

  • Barbiturates
  • Blood alcohol
  • Cannabinoids (correct)
  • Opiates

    • When might a narrow-bore column be used in gas chromatography?

  • For cannabinoid analysis
  • When a fast capillary column is required (correct)
  • For blood alcohol analysis
  • When analyzing inhalants

    • What is the primary disadvantage of gas chromatography compared to other analytical techniques?

    <p>Long analysis times</p> Signup and view all the answers

    Which application area commonly uses DB-1 as the stationary phase in gas chromatography?

    <p>Forensic applications</p> Signup and view all the answers

    What is the advantage of using a 0.25 mm i.d. capillary column in gas chromatography?

    <p>Reduced column overload</p> Signup and view all the answers

    What is the purpose of the polymer coating on a capillary GC column?

    <p>To provide rigidity and flexibility to the column</p> Signup and view all the answers

    Which parameter is critical for a scientist to consider when selecting a column for capillary GC?

    <p>Length of the capillary column</p> Signup and view all the answers

    What role does the internal diameter of the column play in gas chromatography?

    <p>It affects compound separation efficiency</p> Signup and view all the answers

    What is a disadvantage associated with using a capillary GC column?

    <p>Limited sample capacity</p> Signup and view all the answers

    Which feature distinguishes capillary GC columns from packed GC columns?

    <p>Length and internal diameter</p> Signup and view all the answers

    What advantage does capillary GC offer over packed GC columns?

    <p>Faster analysis time</p> Signup and view all the answers

    What are the main instrumental components of a gas chromatograph?

    <p>Gas supply, Sample introduction system, Column oven, Column, Detector, Read-out device</p> Signup and view all the answers

    What is a key aspect that determines the performance of a gas chromatography system?

    <p>Choice of carrier gas</p> Signup and view all the answers

    Why is nitrogen commonly used as the carrier gas in gas chromatography with a flame ionization detector?

    <p>Availability and efficiency</p> Signup and view all the answers

    What is the main advantage of using helium as the carrier gas with a mass spectrometer detector?

    <p>Increased sensitivity</p> Signup and view all the answers

    Which plot can be used to assess the efficiency of a gas chromatograph?

    <p>van Deemter plot</p> Signup and view all the answers

    Besides integration and display of peak area and peak height, what are some other variables typically available in gas chromatography instrumentation?

    <p>Retention time determination parameters</p> Signup and view all the answers

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