6. :Vapour - Part 2
The chapter discusses the processes involved in vapor sampling and analysis, highlighting techniques for collecting and extracting trace vapor organics. It outlines the methodologies used for adsorption during sampling, desorption for analysis, and the significance of factors such as flow rate and breakthrough curves in ensuring effective sampling. Various types of thermal extraction tubes and their applications in analytical instruments are also explored.
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What we have learnt
- Vapor sampling involves collecting trace organics using adsorbents and requires careful operational conditions to avoid losses.
- Desorption techniques, particularly thermal desorption, are essential for analyzing the collected samples effectively.
- Understanding breakthrough curves and flow rates is crucial for optimizing the efficiency of vapor sampling methods.
Key Concepts
- -- Vapor Sampling
- The process of collecting trace vapor organics from ambient air using adsorbents to trap analytes for further analysis.
- -- Adsorption
- The process by which molecules adhere to the surface of an adsorbent material, allowing for the collection of vapors for analysis.
- -- Desorption
- The process of releasing the trapped analytes from the adsorbent into a gas or liquid phase to facilitate analysis.
- -- Breakthrough Curve
- A graphical representation of the relationship between the volume of air sampled and the concentration of analytes detected, indicating the saturation point of an adsorbent.
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