Question

Signal values (in µV) from a $^{13}C$ NMR baseline calculated from an average of 10 scans are given below: 61 µV, 29 µV, 90 µV, 48 µV, 65 µV, 81 µV, 50 µV, 49 µV, 31 µV, 78 µV a. Calculate the minimal detectable signal in µV for an actual $^{13}C$ peak. b. Assuming that the noise in the baseline is the same as the noise for all signal levels, calculate the S/N ratio for a signal of 327 µV. c. Calculate the number of scans necessary to increase the S/N ratio in part (b) to 100:1. d. How would a $^{13}C$ NMR spectrum obtained by ensemble averaging differ in appearance from one obtained by boxcar smoothing? Briefly explain.

          Signal values (in µV) from a $^{13}C$ NMR baseline calculated from an average of 10 scans
are given below:
61 µV, 29 µV, 90 µV, 48 µV, 65 µV, 81 µV, 50 µV, 49 µV, 31 µV, 78 µV
a. Calculate the minimal detectable signal in µV for an actual $^{13}C$ peak.
b. Assuming that the noise in the baseline is the same as the noise for all signal levels,
calculate the S/N ratio for a signal of 327 µV.
c. Calculate the number of scans necessary to increase the S/N ratio in part (b) to
100:1.
d. How would a $^{13}C$ NMR spectrum obtained by ensemble averaging differ in
appearance from one obtained by boxcar smoothing? Briefly explain.

Signal values (in µV) from a ^13C NMR baseline calculated from an average of 10 scans
are given below:
61 µV, 29 µV, 90 µV, 48 µV, 65 µV, 81 µV, 50 µV, 49 µV, 31 µV, 78 µV
a. Calculate the minimal detectable signal in µV for an actual ^13C peak.
b. Assuming that the noise in the baseline is the same as the noise for all signal levels,
calculate the S/N ratio for a signal of 327 µV.
c. Calculate the number of scans necessary to increase the S/N ratio in part (b) to
100:1.
d. How would a ^13C NMR spectrum obtained by ensemble averaging differ in
appearance from one obtained by boxcar smoothing? Briefly explain.

Added by Samuel D.

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