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Chemical Shift: Internal References and Solvent Effects

Chemical Shift: Internal References and Solvent Effects

In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...

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Related Experiment Video

Updated: Jul 16, 2026

Physical, Chemical and Biological Characterization of Six Biochars Produced for the Remediation of Contaminated Sites

Physical, Chemical and Biological Characterization of Six Biochars Produced for the Remediation of Contaminated Sites

Published on: November 28, 2014

Physico-chemical characterization of candidate reference materials

Fatima Ferreira¹, Michael Wallner, Gabriele Gadermaier

¹Universität Salzburg, Naturwiss, Fakultät, Institut für Genetik u. Allgem, Biologie, Salzburg.

Arbeiten Aus Dem Paul-Ehrlich-Institut (Bundesamt Fur Sera Und Impfstoffe) Zu Frankfurt A.M

|March 31, 2007

Summary

No abstract available in PubMed .

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