An analyst needs to evaluate the potential effect of an interferent, I, on the quantitative analysis for an analyte, A. She begins by measuring the signal for a sample in which the interferent is absent and the analyte is present with a concentration of 15 ppm, obtaining an average signal of 23.3 (arbitrary units). When analyzing a sample in which the analyte is absent and the interferent is present with a concentration of 25 ppm, she obtains an average signal of 13-7.

An analyst needs to evaluate the potential effect of an interferent, I, on the quantitative analysis for an analyte, A. She begins by measuring the signal for a sample in which the interferent is absent and the analyte is present with a concentration of 15 ppm, obtaining an average signal of 23.3 (arbitrary units). When analyzing a sample in which the analyte is absent and the interferent is present with a concentration of 25 ppm, she obtains an average signal of 13-7.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

Spectroanalytical Methods

Spectroanalytical methods measure the wavelength and intensity of radiations that are either emitted or absorbed by a molecular or atomic species. These methods are useful for evaluating the electronic or atomic arrangement of the molecules of a given analyte.

Question

An analyst needs to evaluate the potential effect
of an interferent, I, on the quantitative analysis
for an analyte, A. She begins by measuring the
signal for a sample in which the interferent is
absent and the analyte is present with a
concentration of 15 ppm, obtaining an average
signal of 23.3 (arbitrary units). When analyzing
a sample in which the analyte is absent and the
interferent is present with a concentration of 25
ppm, she obtains an average signal of 13.7.

Solve the following problems
a. What is the analyte's sensitivity?
b. What is the interferent's sensitivity?
c. What is the value of the selectivity coefficient?
d. Is the method more selective for the analyte or
the interferent?
e. What is the maximum concentration of
interferent relative to that of the analyte (i.e.,
[interferent]/[analyte]), if the error in the
analysis is to be less than 1%?

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