may be a time lag of up to several days before your sample is run, and
you want to be certain that the spectrum you obtain is of the compound
you submitted. Also, your sample may need to be transported to the NMR
lab, and you will probably not have control over the environmental conditions
en route. It is therefore important to consider any changes that
might occur as a result of a delay or improper handling. If you have a
sample that is not stable, you should discuss it with your instructor
or NMR spectroscopist.