Gas-Liquid Chromatography (GLC) Lecture 10: Detectors
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Questions and Answers

What effect does high solubility in the liquid phase have on retention time in gas-liquid chromatography?

  • Increases retention time (correct)
  • Decreases retention time
  • Has no effect on retention time
  • Causes intermittent retention time

    • How does a higher column temperature affect retention times in gas-liquid chromatography?

  • Lengthens retention times
  • Causes fluctuating retention times
  • Shortens retention times (correct)
  • Has no effect on retention times

    • How does an increase in the gas flow affect retention time in gas-liquid chromatography?

  • Causes irregular retention time fluctuations
  • Increases retention time
  • Decreases retention time (correct)
  • Has no effect on retention time

    • How is quantitative estimation done in gas-liquid chromatography?

    <p>By measuring the area under the peak</p> Signup and view all the answers

    What is the purpose of the detectors in gas-liquid chromatography?

    <p>To detect the emerging sample in the gas form</p> Signup and view all the answers

    Which type of detector is typically used for quantitative analysis in gas-liquid chromatography?

    <p>Flame ionization</p> Signup and view all the answers

    In gas-liquid chromatography, what does the retention time of a compound depend on?

    <p>The boiling point of the compound</p> Signup and view all the answers

    What is the main difference between destructive and non-destructive detectors in gas-liquid chromatography?

    <p>Destructive detectors are used for qualitative analysis, while non-destructive detectors are used for quantitative analysis</p> Signup and view all the answers

    What is the main purpose of the detectors in gas-liquid chromatography?

    <p>To detect the emerging sample in the form of a gas or steam</p> Signup and view all the answers

    Which type of detector is typically integrated for qualitative analysis in gas-liquid chromatography?

    <p>Thermal conductivity (TCD)</p> Signup and view all the answers

    How does the length of the column affect the retention time in gas-liquid chromatography?

    <p>Shorter columns reduce the retention time</p> Signup and view all the answers

    What determines the retention time of a compound in gas-liquid chromatography?

    <p>The boiling point of the compound</p> Signup and view all the answers

    How does high solubility in the liquid phase affect retention time in gas-liquid chromatography?

    <p>Decreases retention time</p> Signup and view all the answers

    What is the impact of a higher column temperature on retention times in gas-liquid chromatography?

    <p>Increases retention times for everything</p> Signup and view all the answers

    In gas-liquid chromatography, how does an increase in the gas flow affect retention time?

    <p>Decreases retention time</p> Signup and view all the answers

    How is quantitative estimation typically done in gas-liquid chromatography?

    <p>By using triangulation to estimate the area under the peak</p> Signup and view all the answers

    What is the purpose of the retention time in gas-liquid chromatography?

    <p>To measure the time taken for a compound to travel through the column to the detector</p> Signup and view all the answers

    Which type of detector is typically integrated for quantitative analysis in gas-liquid chromatography?

    <p>Mass spectral</p> Signup and view all the answers

    How does the boiling point of a compound affect its retention time in gas-liquid chromatography?

    <p>A higher boiling point leads to a longer retention time</p> Signup and view all the answers

    What determines the retention time of a compound in gas-liquid chromatography?

    <p>The length of the column</p> Signup and view all the answers

    How does a higher column temperature affect the retention time of compounds in gas-liquid chromatography?

    <p>It increases the retention time because it excites molecules into the gas phase, reducing their attraction to the liquid phase.</p> Signup and view all the answers

    What is the impact of an increase in gas flow on the retention time in gas-liquid chromatography?

    <p>The retention time decreases because the faster gas flow carries the vaporized solute, causing a quicker emergence of the solute and therefore decreasing the retention time.</p> Signup and view all the answers

    How is quantitative estimation typically done in gas-liquid chromatography?

    <p>By using mechanical or electronic accessories to automatically integrate the area under the peak.</p> Signup and view all the answers

    What role does high solubility in the liquid phase play in determining retention times in gas-liquid chromatography?

    <p>It decreases retention times as highly soluble compounds spend less time being carried along by the gas.</p> Signup and view all the answers

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