C3.3.4 - Blood alcohol (gas chromatography)

Question 1

Describe the steps involved in gas chromatography.

Answer 1

1. Inject sample mixture into gas chromatography instrument.
2. Heat mixture into a gas.
3. Helium gas (mobile phase) is added to the gas mixture.
4. The gas mixture and helium flow through a tube with a polymer column (stationary phase) inside of it.
5. Different substances in the mixture move through the column at different speeds. A computer registers this and produces a gas chromatogram.

Question 2

Which substance in gas chromatography acts as the mobile phase?

Answer 2

Helium gas

Question 3

Which substance in gas chromatography acts as the stationary phase?

Answer 3

A polymer column

Question 4

What does the diagram show?

Answer 4

A gas chromatogram (the result of gas chromatography)

Question 5

What is the name of the drug found in alcoholic drinks?

Answer 5

Ethanol

Question 6

What does the diagram show?

Answer 6

The equipment used in gas chromatography.