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Rate Theory Bond Broadening

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Questions and Answers

What are the three main factors contributing to zone broadening?

Column length, column diameter, sample concentration

Longitudinal diffusion, resistance to mass transfer, multiple path effect (correct)

Temperature, pressure, flow rate

Mobile phase composition, stationary phase composition, solute size

What is the equation for band broadening as a result of longitudinal diffusion?

$HL = \frac{DM}{V}$

$HL = \frac{V \times DM}{L1}$

$HL = \frac{L1 \times DM}{V}$ (correct)

$HL = L1 \times V \times DM$

In which situation is longitudinal diffusion not very important in liquid chromatography?

At high flow rates (correct)

At low temperature

At high temperature

At low flow rates

What does the degree of band broadening in longitudinal diffusion depend on?

<p>Diffusion of the solute and the flow rate of the solute through the column</p> Signup and view all the answers

What contributes to a decrease in band broadening as a result of longitudinal diffusion?

<p>Increase in velocity of mobile phase</p> Signup and view all the answers

Study Notes

Factors Contributing to Zone Broadening

Three main factors contribute to zone broadening: longitudinal diffusion, eddy diffusion, and mass transfer

Longitudinal Diffusion

Band broadening as a result of longitudinal diffusion is described by the equation: σ² = 2DT
Where σ² is the variance, D is the diffusion coefficient, and T is time
Longitudinal diffusion is not very important in liquid chromatography when the flow rate is high
The degree of band broadening in longitudinal diffusion depends on the diffusion coefficient of the analyte, the time spent in the column, and the flow rate
A decrease in band broadening as a result of longitudinal diffusion is contributed by a high flow rate and a low diffusion coefficient of the analyte

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Description

Test your knowledge on the factors contributing to zone broadening in rate theory. Learn about longitudinal diffusion, resistance to mass transfer, and the multiple path effect (Eddy diffusion).