NAME______________________________________________

I. We will be analyzing liquids using gas chromatography. What must be the minimum temperature of the GC column? (This is not necessarily the temperature we will run at).
 
 
 
 

II. Which of the following mixtures could be analyzed with GC? Assume that the separation doesn't destroy the GC.  Assume a availabe temperature range of - 210 to + 250.  More than one answer is correct.

a) pentane, heptane, and nonane

b) air

c) salt water

d) benzoic acid, sand, and charcoal
 
 
 
 

III. How would the following changes affect the retention time of a GC sample?

Answer "longer", "shorter", or "no change".

a) Increasing the column temperature

b) Slowing the chart speed

c) Decreasing the carrier gas flow rate

d) Shortening the column length