This experiment involves the use of gas chromatography to determine the concentration of decane, dodecane and tetradecane in an unknown sample using internal standardisation where the internal standard is undecane. Answer the following questions:
A. The stationary phase in the column that was used in the experiment is a polydimethylsiloxane which is chemically bonded onto the inner surface of the silica capillary. Is this phase non-polar, medium polarity or high polarity? And why?
B. Give reasons why it would be the stationary phase of choice in the separation of hydrocarbons.
C. Give two advantages of capillary GC columns over packed GC columns. Explain your answer.
D. When do you think that external standardisation would be used as the quantitative method of choice in GC analysis? Why?
E. Give two characteristics that an internal standard for a gas-chromatographic analysis must possess and why.
F. Single point calibration was used in the procedure for this experiment but what does this mean and what assumptions would need to be made if the analytical results obtained using the calibration method are valid?
This experiment involves the use of gas chromatography to determine the concentration of decane, dodecane and tetradecane in an unknown sample using internal standardisation where the internal standard is undecane. Answer the following questions:
A. The stationary phase in the column that was used in the experiment is a polydimethylsiloxane which is chemically bonded onto the inner surface of the silica capillary. Is this phase non-polar, medium polarity or high polarity? And why?
B. Give reasons why it would be the stationary phase of choice in the separation of hydrocarbons.
C. Give two advantages of capillary GC columns over packed GC columns. Explain your answer.
D. When do you think that external standardisation would be used as the quantitative method of choice in GC analysis? Why?
E. Give two characteristics that an internal standard for a gas-chromatographic analysis must possess and why.
F. Single point calibration was used in the procedure for this experiment but what does this mean and what assumptions would need to be made if the analytical results obtained using the calibration method are valid?
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