Principles of Instrumental Analysis, 6th Edition
6th Edition
ISBN: 9788131525579
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cenage Learning
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Chapter 15, Problem 15.15QAP
The following lifetimes were measured for the chloride quenching of quinine sulfate given in Example 15-1.The fluorescence intensities are given in the example.
(a) Plot fluorescence intensity versus [Cl-].
(b) Plot the ratio of intensity to lifetime, F-
(c) Develop a normalization factor to correct the measured fluorescence intensity to that of the solution without quencher.
(d) Plot on the same graph Fversus [Cl-] and Fcorr versus (CI-].
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Reagan is doing an atomic absorption experiment that requires a set of zinc standards in the 0.4-
1.6 ppm range. A 1000 ppm Zn solution was prepared by dissolving the necessary amount of
solid Zn(NO3)2 in water. The standards can be prepared by diluting the 1000 ppm Zn solution.
Table 1 shows one possible set of serial dilutions (stepwise dilution of a solution) that Reagan
could perform to make the necessary standards. Solution A was prepared by diluting 5.00 ml of
the 1000 ppm Zn standard to 50.00 ml. Solutions C-E are called "calibration standards" because
they will be used to calibrate the atomic absorption spectrometer.
Table 1: Dilutions of Zinc Solutions
Solution
Zinc Solution
Volume
Diluted Solution
Concentration
used
volume
(ppm Zn)
(mL)
(mL)
concentration
(ppm Zn)
Solution
concentration
A
1000
5.00
50.00
1.00×10²
(ppm
Zn(NO3)2)
2.90×10²
Solution
concentration
(M Zn(NO3)2
1.53×10-3
B
Solution A 5.00
100.00
5.00
C
Solution B 5.00 50.00
0.50
7.65×10-6
D
Solution B 10.00 50.00…
Chapter 15 Solutions
Principles of Instrumental Analysis, 6th Edition
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