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 26, Problem 26.10QAP
Interpretation Introduction
Interpretation:
The reason for the minimum in a plot of plate height versus flow rate occurring at lower rates with LC than with GC is to be stated.
Concept introduction:
LC refers to liquid chromatography and GC refers to gas chromatography. Diffusion refers to the movement of any substance from a region of high concentration to a region of low concentration. This phenomenon generally takes place in liquids as well as gases since their particles execute random motion from one place to another. It is a concentration driven mass transfer process.
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One method for quantitative determination of the concentration of constituents in a sample analyzed by gas chromatography is the area normalization method. In this method, complete elution of all of the sample constituents is necessary. The area of each peak is then measured and corrected for differences in detector response to the different eluates. This correction is accomplished by dividing the area by an empirically determined correction factor. The concentration of the analyte is found from the ratio of its corrected area to the total corrected area of all peaks. For a chromatogram containing three peaks, the relative areas were found to be 16.4, 45.2, and 30.2 in the order of increasing retention time. Calculate the percentage of each compound if the relative detector responses were 0.60, 0.78, and 0.88, respectively
Chapter 26 Solutions
Principles of Instrumental Analysis
Ch. 26 - Prob. 26.1QAPCh. 26 - Prob. 26.2QAPCh. 26 - Prob. 26.3QAPCh. 26 - Prob. 26.4QAPCh. 26 - Prob. 26.5QAPCh. 26 - Prob. 26.6QAPCh. 26 - Prob. 26.7QAPCh. 26 - Prob. 26.8QAPCh. 26 - Prob. 26.9QAPCh. 26 - Prob. 26.10QAP
Ch. 26 - Prob. 26.11QAPCh. 26 - Prob. 26.12QAPCh. 26 - Prob. 26.13QAPCh. 26 - Prob. 26.14QAPCh. 26 - Prob. 26.15QAPCh. 26 - Prob. 26.16QAPCh. 26 - From the data in Problem 26-14, calculate for...Ch. 26 - Prob. 26.18QAPCh. 26 - Prob. 26.19QAPCh. 26 - Prob. 26.20QAPCh. 26 - Prob. 26.21QAPCh. 26 - Prob. 26.22QAPCh. 26 - Prob. 26.23QAP
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