Atomic absorption spectroscopy was used with the method of standard additions to determine the concentration of cadmium in a sample of an industrial waste stream. For the addition, 10.0 µL of a 1000.0 µg/mL Cd standard was added to 10.0 mL of the unknown solution. The results obtained are shown in the table. Absorbance 0.044 0.300 0.701 Reagent blank Sample Sample plus addition What is the concentration of the cadmium in the waste stream sample? C= µg/mL

Atomic absorption spectroscopy was used with the method of standard additions to determine the concentration of cadmium in a sample of an industrial waste stream. For the addition, 10.0 µL of a 1000.0 µg/mL Cd standard was added to 10.0 mL of the unknown solution. The results obtained are shown in the table. Absorbance 0.044 0.300 0.701 Reagent blank Sample Sample plus addition What is the concentration of the cadmium in the waste stream sample? C= µg/mL

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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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

Atomic absorption spectroscopy was used with the method of standard additions to determine the concentration of cadmium in a
sample of an industrial waste stream. For the addition, 10.0 µL of a 1000.0 µg/mL Cd standard was added to 10.0 mL of the
unknown solution. The results obtained are shown in the table.
Reagent blank
Sample
Sample plus addition
What is the concentration of the cadmium in the waste stream sample?
C =
Absorbance
0.044
0.300
0.701
C =
Later, the analyst learned that the blank was not truly a reagent blank, but water. The absorbance of the actual reagent blank, is
0.10. Calculate the cadmium concentration using the new information for the blank.
µg/mL
Calculate the percent error caused by using water as the blank instead of the reagent blank.
µg/mL

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