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 0.013 and a blank standard deviation of 0.0030. The following data were obtained for a calibration curve. [As] (ppm) 2.0 4.0 6.0 8.0 10.0 Absorbance 0.17 0.28 0.48 0.53 0.72

Fundamentals Of Analytical Chemistry
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Chapter16: Applications Of Neutralization Titrations
Section: Chapter Questions
Problem 16.17QAP
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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 0.013 and a blank standard deviation of
0.0030. The following data were obtained for a calibration curve.
[As] (ppm)
2.0
4.0
6.0
8.0
10.0
Absorbance
0.17
0.28
0.48
0.53
0.72
(a). What is the sensitivity of the method?
(b). Calculate the LOD and LOQ for As.
(c). A sample of water yielded an absorbance of 0.43. What is the
concentration of As in the water?
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 0.013 and a blank standard deviation of 0.0030. The following data were obtained for a calibration curve. [As] (ppm) 2.0 4.0 6.0 8.0 10.0 Absorbance 0.17 0.28 0.48 0.53 0.72 (a). What is the sensitivity of the method? (b). Calculate the LOD and LOQ for As. (c). A sample of water yielded an absorbance of 0.43. What is the concentration of As in the water?
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