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Chapter 23: Q36P (page 631)

Why is longitudinal diffusion a more serious problem in gas chromatography than in liquid chromatography?

Short Answer

Expert verified

The solution is

longitudinal diffusion in gas chromatography would be substantially faster than in liquid chromatography.

Step by step solution

01

of 3

We will discuss why longitudinal diffusion is a more serious issue in gas chromatography than it is in liquid chromatography in this task.

02

of 3

Longitudinal diffusion

a band's diffusional widening that is most noticeable below the optimum linear velocity.

03

of 3

Gases have diffusion coefficients that are104 times greater than liquid diffusion coefficients, as we know.

- As a result, longitudinal diffusion in gas chromatography would be substantially faster than in liquid chromatography.

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Most popular questions from this chapter

A layer with negligible thickness containing 10.0nmol of methano(D=1.6×10-9m2/s)was placed in a tube of water 5.00 cm in diameter and allowed to spread by diffusion. Using Equation 23-27, prepare a graph showing the Gaussian concentration profile of the methanol zone after 1.00,10.0, and 100 min. Prepare a second graph showing the same experiment with the enzyme rib nuclease(D=1.12×10-9m2/s).

23-47. A chromatographic peak has a width,W,of 4.0mLand a retention volume of role="math" localid="1654842133798" 49mL. What width is expected for a band with a retention volume of 127mL? Assume that the only band spreading occurs on the column itself.

23-42. A separation of 2.5mgof an unknown mixture has been optimized on a column of length L and diameter d .

(a) Explain why you might not achieve the same resolution if the 2.5mgof unknown mixture were injected in twice the injection volume.

(b) Explain why you might not achieve the same resolution if5.0mg of unknown mixture were injected in the original injection volume.

The weak base B(Kb=1.0×10-5)equilibrates between water (phase 1) and benzene (phase 2)

(a) Define the distribution coefficient, D for this system.

(b) Explain the difference between D and K the partition coefficient.

(c) Calculate D at pH8.00ifk=50.0

(d) Will D be greater or less at pH10thanatpH8? Explain why.

Which of the following columns will provide:

(a) highest number of plates?

(b) greatest retention?

(c) highest relative retention?

(d) best separation?

Column1:N=1000;k2=3.9;α=1.16;resolution=0.6Column2:N=5000;k2=3.9;α=1.06;resolution=0.8Column3:N=500;k2=4.7;α=1.31;resolution=1.1Column4:N=2000;k2=2.4;α=1.24;resolution=1.5
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