Principles of Instrumental Analysis
Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
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Chapter 9, Problem 9.17QAP
Interpretation Introduction

Interpretation:

The sources of two signals appearing during ashing and drying process needs to be determined.

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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8. In real life, NMR samples often contain impurities, so extra signals will appear on your spectrum that are not related to your product. The document "Common NMR impurities" lists some common impurities and their NMR data. Here are some instructions for reading this document: o Use Table 1 on page 2 of the document, focusing on the column for CDCI3. (This is the NMR solvent we are using.) o The impurities are listed in the first column. o The "mut" column tells you the multiplicities those signals should have. • s = singlet, d = doublet, t = triplet, q = quartet, etc. o The numbers in the table are the chemical shifts that certain impurities appear at. o For example, if diethyl ether is present in your sample, you should see two signals: a triplet at 1.21 ppm and a quartet at 3.48 ppm.
a. Discuss about how molecular spectra differ from the atomic spectra and why. b. Discuss the effect of concentration on the absorption and fluorescence spectra as observed. c. Discuss the effect of excitation wavelength on the fluorescence spectra as observed. d. Discuss the shift of fluorescence spectrum comparing to the absorption spectrum.
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