(a) Interpretation: The reason for decrease in atomic absorption signal for iron in presence of large concentration of sulphate ion in hydrogen-oxygen flame needs to be explained. Concept introduction: In a defined space, the amount of a substance gives its concentration. A substance’s capacity to absorb specific wavelength light gives its absorbance.

Question

(a 4 shows scanning electron microscope (SEM) images of extruded actions of packing bed for two capillary columns of different diameters, al 750 (bottom image) and b) 30-μm-i.d. Both columns are packed with the same stationary phase, spherical particles with 1-um diameter. A) When the columns were prepared, the figure shows that the column with the larger diameter has more packing irregularities. Explain this observation. B) Predict what affect this should have on band broadening and discuss your prediction using the van Deemter terms. C) Does this figure support your explanations in application question 33? Explain why or why not and make any changes in your answers in light of this figure. Figure 4 SEM images of sections of packed columns for a) 750 and b) 30-um-i.d. capillary columns.³

Answer 1

Question

Chapter 9, Problem 9.13QAP

Interpretation Introduction

(a)

Interpretation:

The reason for decrease in atomic absorption signal for iron in presence of large concentration of sulphate ion in hydrogen-oxygen flame needs to be explained.

Concept introduction:

In a defined space, the amount of a substance gives its concentration. A substance’s capacity to absorb specific wavelength light gives its absorbance.

Interpretation Introduction

(b)

Interpretation:

The ways of overcoming interference of sulphate in iron determination needs to be explained.

Concept introduction:

In a defined space, the amount of a substance gives its concentration. A substance’s capacity to absorb specific wavelength light gives its absorbance.

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(a 4 shows scanning electron microscope (SEM) images of extruded actions of packing bed for two capillary columns of different diameters, al 750 (bottom image) and b) 30-μm-i.d. Both columns are packed with the same stationary phase, spherical particles with 1-um diameter. A) When the columns were prepared, the figure shows that the column with the larger diameter has more packing irregularities. Explain this observation. B) Predict what affect this should have on band broadening and discuss your prediction using the van Deemter terms. C) Does this figure support your explanations in application question 33? Explain why or why not and make any changes in your answers in light of this figure. Figure 4 SEM images of sections of packed columns for a) 750 and b) 30-um-i.d. capillary columns.³

fcrip = ↓ bandwidth Il temp 32. What impact (increase, decrease, or no change) does each of the following conditions have on the individual components of the van Deemter equation and consequently, band broadening? Increase temperature Longer column Using a gas mobile phase instead of liquid Smaller particle stationary phase Multiple Paths Diffusion Mass Transfer

34. Figure 3 shows Van Deemter plots for a solute molecule using different column inner diameters (i.d.). A) Predict whether decreasing the column inner diameters increase or decrease bandwidth. B) Predict which van Deemter equation coefficient (A, B, or C) has the greatest effect on increasing or decreasing bandwidth as a function of i.d. and justify your answer. Figure 3 Van Deemter plots for hydroquinone using different column inner diameters (i.d. in μm). The data was obtained from liquid chromatography experiments using fused-silica capillary columns packed with 1.0-μm particles. 35 20 H(um) 큰 20 15 90 0+ 1500 100 75 550 01 02 594 05 μ(cm/sec) 30 15 10

Answer 2

Question

Chapter 9, Problem 9.13QAP

Interpretation Introduction

(a)

Interpretation:

The reason for decrease in atomic absorption signal for iron in presence of large concentration of sulphate ion in hydrogen-oxygen flame needs to be explained.

Concept introduction:

In a defined space, the amount of a substance gives its concentration. A substance’s capacity to absorb specific wavelength light gives its absorbance.

Interpretation Introduction

(b)

Interpretation:

The ways of overcoming interference of sulphate in iron determination needs to be explained.

Concept introduction:

In a defined space, the amount of a substance gives its concentration. A substance’s capacity to absorb specific wavelength light gives its absorbance.

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Answer 3

Question

Chapter 9, Problem 9.13QAP

Interpretation Introduction

(a)

Interpretation:

The reason for decrease in atomic absorption signal for iron in presence of large concentration of sulphate ion in hydrogen-oxygen flame needs to be explained.

Concept introduction:

In a defined space, the amount of a substance gives its concentration. A substance’s capacity to absorb specific wavelength light gives its absorbance.

Interpretation Introduction

(b)

Interpretation:

The ways of overcoming interference of sulphate in iron determination needs to be explained.

Concept introduction:

In a defined space, the amount of a substance gives its concentration. A substance’s capacity to absorb specific wavelength light gives its absorbance.

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Answer 4

Question

Chapter 9, Problem 9.13QAP

Interpretation Introduction

(a)

Interpretation:

The reason for decrease in atomic absorption signal for iron in presence of large concentration of sulphate ion in hydrogen-oxygen flame needs to be explained.

Concept introduction:

In a defined space, the amount of a substance gives its concentration. A substance’s capacity to absorb specific wavelength light gives its absorbance.

Interpretation Introduction

(b)

Interpretation:

The ways of overcoming interference of sulphate in iron determination needs to be explained.

Concept introduction:

In a defined space, the amount of a substance gives its concentration. A substance’s capacity to absorb specific wavelength light gives its absorbance.

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Answer 5

Chapter 9, Problem 9.13QAP

Interpretation Introduction

(a)

Interpretation:

The reason for decrease in atomic absorption signal for iron in presence of large concentration of sulphate ion in hydrogen-oxygen flame needs to be explained.

Concept introduction:

In a defined space, the amount of a substance gives its concentration. A substance’s capacity to absorb specific wavelength light gives its absorbance.

Interpretation Introduction

(b)

Interpretation:

The ways of overcoming interference of sulphate in iron determination needs to be explained.

Concept introduction:

In a defined space, the amount of a substance gives its concentration. A substance’s capacity to absorb specific wavelength light gives its absorbance.

Answer 6

Chapter 9, Problem 9.13QAP

Interpretation Introduction

(a)

Interpretation:

The reason for decrease in atomic absorption signal for iron in presence of large concentration of sulphate ion in hydrogen-oxygen flame needs to be explained.

Concept introduction:

In a defined space, the amount of a substance gives its concentration. A substance’s capacity to absorb specific wavelength light gives its absorbance.

Answer 7

Chapter 9, Problem 9.13QAP

Interpretation Introduction

(a)

Interpretation:

The reason for decrease in atomic absorption signal for iron in presence of large concentration of sulphate ion in hydrogen-oxygen flame needs to be explained.

Concept introduction:

In a defined space, the amount of a substance gives its concentration. A substance’s capacity to absorb specific wavelength light gives its absorbance.

Answer 8

Interpretation Introduction

(b)

Interpretation:

The ways of overcoming interference of sulphate in iron determination needs to be explained.

Concept introduction:

In a defined space, the amount of a substance gives its concentration. A substance’s capacity to absorb specific wavelength light gives its absorbance.

Answer 9

Interpretation Introduction

(b)

Interpretation:

The ways of overcoming interference of sulphate in iron determination needs to be explained.

Concept introduction:

In a defined space, the amount of a substance gives its concentration. A substance’s capacity to absorb specific wavelength light gives its absorbance.

Answer 10

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Answer 11

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Answer 21

Ch. 9 - Prob. 9.1QAP Ch. 9 - Prob. 9.2QAP Ch. 9 - Why is an electrothermal atomizer more sensitive...Ch. 9 - Prob. 9.4QAP Ch. 9 - Prob. 9.5QAP Ch. 9 - Prob. 9.6QAP Ch. 9 - Prob. 9.7QAP Ch. 9 - Prob. 9.8QAP Ch. 9 - Prob. 9.9QAP Ch. 9 - Prob. 9.10QAP

(b) Interpretation: The ways of overcoming interference of sulphate in iron determination needs to be explained. Concept introduction: In a defined space, the amount of a substance gives its concentration. A substance’s capacity to absorb specific wavelength light gives its absorbance.

Chapter 9 Solutions

(b)

Interpretation:

The ways of overcoming interference of sulphate in iron determination needs to be explained.

Concept introduction:

In a defined space, the amount of a substance gives its concentration. A substance’s capacity to absorb specific wavelength light gives its absorbance.