(c). What is the dynamic range of the method? Hint: it is NOT the entire concentration range. (d). A sample of water yielded an absorbance of 0.36. What is the concentration of As in the water?
(c). What is the dynamic range of the method? Hint: it is NOT the entire concentration range. (d). A sample of water yielded an absorbance of 0.36. What is the concentration of As in the water?
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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Solve (c) and (d)
![A graphite furnace atomic absorption spectrophotometer (AAS) was used to determine the
arsenic (As) concentrations in drinking water. A large set of blank samples yielded an average
blank signal of 0.015 and a blank standard deviation of 0.0050. The following data were
obtained for a calibration curve.
[As] (ppm)
2.0
4.0
6.0
8.0
10.0
Absorbance
0.15
0.27
0.46
0.55
0.71
Using a spreadsheet on an Excel, create a graph of the data using symbols only for the data
points. Plot the line on the same graph and include the graph to this question. Answer the
following questions.
(a). What is the sensitivity of the method?
(b). Calculate the LOD and LOQ for As.
(c). What is the dynamic range of the method? Hint: it is NOT the entire
concentration range.
(d). A sample of water yielded an absorbance of 0.36. What is the concentration of
As in the water?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fff27d977-6639-41de-970b-870c8d92922e%2F49fc08aa-6d03-4378-9deb-dfe149c0c93d%2F9t1n30ue_processed.png&w=3840&q=75)
Transcribed Image Text:A graphite furnace atomic absorption spectrophotometer (AAS) was used to determine the
arsenic (As) concentrations in drinking water. A large set of blank samples yielded an average
blank signal of 0.015 and a blank standard deviation of 0.0050. The following data were
obtained for a calibration curve.
[As] (ppm)
2.0
4.0
6.0
8.0
10.0
Absorbance
0.15
0.27
0.46
0.55
0.71
Using a spreadsheet on an Excel, create a graph of the data using symbols only for the data
points. Plot the line on the same graph and include the graph to this question. Answer the
following questions.
(a). What is the sensitivity of the method?
(b). Calculate the LOD and LOQ for As.
(c). What is the dynamic range of the method? Hint: it is NOT the entire
concentration range.
(d). A sample of water yielded an absorbance of 0.36. What is the concentration of
As in the water?
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