Worked Example: Gas-Liquid Chromatography Analysis
This page presents a practical application of gas-liquid chromatography (GLC) through a worked example, demonstrating how to interpret chromatogram data.
The example shows the analysis of a compound by GLC, revealing the presence of four components: A, B, C, and D. The chromatogram displays the response over time, with peaks representing each component.
Questions and Answers:
- Which compound is present in the greatest quantity?
Answer: Component D
Highlight: The larger the relative size of the peak, the greater the quantity of that substance present in the sample.
- Which compounds were present in equal amounts?
Answer: Components B and C
Example: Equal peak sizes on a chromatogram indicate equal quantities of those components in the mixture.
- Which compound had the strongest interaction with the stationary phase?
Answer: Component D
Vocabulary: Gas-liquid chromatography retention time - The time taken for a component to travel through the column, from injection to detection.
Highlight: The larger the retention time (i.e., the further to the right on the chromatogram), the greater the interaction of that component with the stationary phase.
This example illustrates key principles of interpreting GLC data:
- Peak size relates to quantity: Larger peaks indicate greater amounts of a component.
- Peak position indicates retention time: Components that interact more strongly with the stationary phase have longer retention times and appear further to the right on the chromatogram.
- Comparative analysis: By comparing peak sizes and positions, we can deduce relative quantities and interactions of different components in a mixture.
Understanding these principles is crucial for accurately analyzing complex mixtures using gas-liquid chromatography.