Chapter 24, Problem 24.37P

a)

Interpretation Introduction

Interpretation:

A graph has to be plotted using a spreadsheet representing the mass of analyte extracted into fibre.

Concept Introduction:

Solid-phase microextraction:

The extraction of compounds from liquids, air or sludge without any solvent is called as solid-phase microextraction. The major component is the fused-silica fibre coated with $\text{10-100μm}$ thickness in film of stationary phase exactly to those used in gas chromatography.

The mass of analyte absorbed in the coated fibre is calculated using the formula,

$\text{m=}\frac{{\text{KV}}_{\text{f}}{\text{c}}_{\text{0}}{\text{V}}_{\text{s}}}{{\text{KV}}_{\text{f}}{\text{+V}}_{\text{s}}}$

Where ${\text{V}}_{\text{f}}$ = volume of film on the fibre

${\text{V}}_{\text{s}}$ = volume of solution that is extracted

${\text{c}}_{\text{0}}$ = initial concentration of analyte in the solution that is extracted

$\text{K}$ = partition coefficient for solute between film and solution.

To plot a graph showing the extracted mass (vs) volume of the solution

b)

Interpretation Introduction

Interpretation:

The limit of ${\text{V}}_{\text{s}}$ that gets relatively larger to ${\text{KV}}_{\text{f}}$ has to be evaluated and also to verify if the extracted mass approaches the limit

Concept Introduction:

Solid-phase microextraction:

The extraction of compounds from liquids, air or sludge without any solvent is called as solid-phase microextraction. The major component is the fused-silica fibre coated with $\text{10-100μm}$ thickness in film of stationary phase exactly to those used in gas chromatography.

The mass of analyte absorbed in the coated fibre is calculated using the formula,

$\text{m=}\frac{{\text{KV}}_{\text{f}}{\text{c}}_{\text{0}}{\text{V}}_{\text{s}}}{{\text{KV}}_{\text{f}}{\text{+V}}_{\text{s}}}$

Where ${\text{V}}_{\text{f}}$ = volume of film on the fibre

${\text{V}}_{\text{s}}$ = volume of solution that is extracted

${\text{c}}_{\text{0}}$ = initial concentration of analyte in the solution that is extracted

$\text{K}$ = partition coefficient for solute between film and solution.

To estimate the limit of ${\text{V}}_{\text{s}}$ that gets relatively larger to ${\text{KV}}_{\text{f}}$ has to be evaluated and also to verify if the extracted mass approaches the limit

c)

Interpretation Introduction

Interpretation:

The percentage of the analyte from 100 ml of solution is extracted if K=100 and K=10000 has to be calculated.

To calculate the percentage of the analyte from 100 ml of solution is extracted if K=100 and K=10000