Chapter 25, Problem 25.12P

a)

Interpretation Introduction

Interpretation:

A graph has to be sketched for van Deemter equation and the shape of curve if the given terms were zero has to be given.

Concept Introduction:

Deemter equation:

The Deemter equation is given as,

$\text{H}\approx \text{A+}\frac{\text{B}}{{\text{u}}_{\text{x}}}{\text{+Cu}}_{\text{x}}$

Where A is multiple paths

$\frac{\text{B}}{{\text{u}}_{\text{x}}}$ is Longitudinal diffusion

${\text{Cu}}_{\text{x}}$ is equilibration time

b)

Interpretation Introduction

Interpretation:

The reason has to be explained for the flatness in van Deemter curve for $\text{1}\text{.8μm}$ particles at higher flow rate and terms in the van Deemter equation for $\text{1}\text{.8μm}$ particles have to be explained.

Concept Introduction:

Deemter equation:

The Deemter equation is given as,

$\text{H}\approx \text{A+}\frac{\text{B}}{{\text{u}}_{\text{x}}}{\text{+Cu}}_{\text{x}}$

Where A is multiple paths

$\frac{\text{B}}{{\text{u}}_{\text{x}}}$ is Longitudinal diffusion

${\text{Cu}}_{\text{x}}$ is equilibration time

c)

Interpretation Introduction

Interpretation:

The reason has to be explained for $\text{2}\text{.7μm}$ particles of superficial porous nature that enables separation similar to that of $\text{1}\text{.8μm}$ particles that are totally porous in nature but superficially porous particles requires lower pressure.