Gas Chromatography

Gas Chromatography, part 1 (Video)

An introduction to gas chromatography and instrumentation.

Gas Chromatography, part 2 (Video)

GC columns, GC stationary phases, and applications discussed.

Exercises Chromatography Basics and Gas Chromatography

Chromatography Basics and Gas Chromatography

1) What effect does flow rate have on plate height? What is the mathematical relationship that describes this effect? What does a plot of flow rate versus plate height look like?

2) Two peaks in a chromatogram are separated at a resolution of 0.85 using a GC column that is 15 m long. What column length would be required to get these peaks to be baseline separated?

3) What are the basic parts of a gas chromatography (GC) system? Describe the function of each part.

4) a) What type of detector would be best for detecting chlorinated pesticides? Draw a simple diagram of this detector and describe how it works.

b) What type of detector would be best for detecting hydrocarbons in a petroleum sample? Draw a simple diagram of this detector and describe how it works. What second type of detector could also be appropriate for this type of sample? Draw a simple diagram of this detector and describe how it works.

c) What is meant by a “selective” detector? Provide some examples.

d) Provide some examples of detectors that produce both qualitative and quantitative information.