BuyFind

Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213
BuyFind

Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213

Solutions

Chapter 29, Problem 29.11QAP
Interpretation Introduction

(a)

Interpretation:

The reason behind the non-elution of highly polar or ionic compounds in SFC is to be stated.

Concept introduction:

The polar or ionic compounds are the compounds that contain the ions of opposite charges which are held together by the electrostatic forces of attraction.

Interpretation Introduction

(b)

Interpretation:

The types of mobile-phase additives used to improve the elution of highly polar ionic compounds are to be determined.

Concept introduction:

The mobile phase additives are the compounds which when added to the highly polar or ionic compounds improves the elution of them.

Interpretation Introduction

(c)

Interpretation:

The reason for the ion-pairing SFC not to be used generally is to be determined.

Concept introduction:

Ion pairing with the analytic is one of the possible retention mechanisms being considered.

Interpretation Introduction

(d)

Interpretation:

The reason for the addition of ammonium salts as mobile phase modifiers in SFC is to be determined.

Concept introduction:

Ammonium salts as mobile phase modifiers in SFCwere very strongly or irreversibly retained without additive (at the same percentage of methanol) were successfully eluted from a DeltabondCyano stationary phase.

Interpretation Introduction

(e)

Interpretation:

The comparison of the compatibility of SFC with MS and HPLC and GC with MS.

Concept introduction:

All are types of chromatographic techniques.

Interpretation Introduction

(f)

Interpretation:

The effect observed when authors studied the effect of column outlet pressure on the elution of sodium 4-dodecycelbenzene sulfonate on three different stationary phases with five mobile phase additives and the explanation for the effect is to be explained.

Concept introduction:

Retention changes under pressure and this change arises from the change in the molar volume of the different substances.

Interpretation Introduction

(g)

Interpretation:

What elution mechanisms were considered by the authors.

Concept introduction:

The elution mechanisms were mainly used for extracting one material from another material by washing with a solvent.

Interpretation Introduction

(h)

Interpretation:

The mobile phase additive that gives the fastest elution of the sulfonate salts is to be determined along with the name of the one that provided the longest retention times.

Concept introduction:

Less polar molecules will get eluted fast than the high polar molecules when used with a weak polar solvent.

Interpretation Introduction

(i)

Interpretation:

Whether a silica column gives the result similar to or different from a cyno- bonded phase column.

Concept introduction:

Cyno columns are usually prepared by bonding a cyanopropyl silane to the silica.

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