Figure 20-36 shows standard uncertainty for measurements of carbon monoxide using averaging times of 11 to 1

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Figure 20-36 shows standard uncertainty for measurements of carbon monoxide using averaging times of 11 to 1 000 s. 1000 s.
a. Figure 20-36 is a log-log plot. Read the standard uncertainty for 44 and 1616 s of signal averaging off the graph.
b. Based on a value of 1.18 ppm 1.18 ppm for 1 s 1s of signal averaging, what are the expected standard uncertainties at 4 4 and 16 s 16s  in an ideal experiment?
c. What standard uncertainty is predicted if signal is averaged for 100 s 100 s ? Does this agree with the experimental results in Figure 20-36?
d. Why does standard uncertainty increase when averaging for 200200 or more seconds?

Figure 20-36

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Quantitative Chemical Analysis

ISBN: 9781319164300

10th Edition

Authors: Daniel C. Harris, Charles A. Lucy

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