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Questions and Answers
What is the main purpose of gas chromatography?
What is the main purpose of gas chromatography?
- To combine volatile substances in a gaseous mixture
- To analyze non-volatile substances
- To separate volatile substances in a gaseous mixture (correct)
- To create a gaseous mixture from volatile substances
Which type of gas chromatography is most useful for the separation and analysis of gases like CH4 and CO2?
Which type of gas chromatography is most useful for the separation and analysis of gases like CH4 and CO2?
- Gas liquid chromatography (GLC)
- Neither GSC nor GLC can separate these gases
- Gas solid chromatography (GSC) (correct)
- They are equally useful for these gases
What is the role of the stationary phase in gas solid chromatography?
What is the role of the stationary phase in gas solid chromatography?
- It is a mobile phase that moves through the column
- It is a liquid with low volatility
- It is a gas that carries the sample
- It is a solid where solutes adsorb (correct)
What is the mobile phase in gas liquid chromatography?
What is the mobile phase in gas liquid chromatography?
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What happens as the carrier gas flows through the column in gas chromatography?
What happens as the carrier gas flows through the column in gas chromatography?
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Study Notes
Gas Chromatography
- The main purpose of gas chromatography is to separate, identify, and quantify the components of a mixture.
Types of Gas Chromatography
- Gas-solid chromatography is most useful for the separation and analysis of gases like CH4 and CO2.
Stationary Phase
- In gas-solid chromatography, the stationary phase is a solid adsorbent that retains the sample components, allowing for separation based on their affinity for the adsorbent.
Mobile Phase
- In gas-liquid chromatography, the mobile phase is a carrier gas that flows through the column and carries the sample components.
Separation Process
- As the carrier gas flows through the column in gas chromatography, the sample components separate based on their boiling points, polarity, and affinity for the stationary phase.
- The components exit the column at different times, allowing for identification and quantification.
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