Discussion
Chemical shift is expressed in parts per million so that the value is
Answer: B
Correct answer: independent of the instrument’s field strength
The frequency difference between a signal and the reference is proportional to the applied field, so it would be a different number on every instrument. Dividing by the operating frequency removes that dependence:
\[ \delta = \frac{\nu_{sample} - \nu_{ref}}{\nu_{spectrometer}} \times 10^6 \]A proton at 7.26 ppm is at 7.26 ppm on a 60 MHz instrument and on a 600 MHz one, which is what makes published shift tables usable at all.
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