Discussion
What is the residual solvent peak in deuterated chloroform used for?
Answer: C
The small proportion of ordinary chloroform left in the deuterated solvent gives a peak at 7.26 ppm that is commonly used to reference the spectrum when no TMS has been added. Its position is tabulated for every common solvent. The lock follows deuterium, not this proton signal; its concentration is not known accurately enough for quantitation; and shimming is judged from lineshape and lock level rather than from this peak. Referencing to the residual peak is convenient and adequate for almost all routine reporting.
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