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Related Concept Videos

Chemical Shift: Internal References and Solvent Effects01:17

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: May 8, 2026

Preparation of Food Samples Using Homogenization and Microwave-Assisted Wet Acid Digestion for Multi-Element Determination with ICP-MS
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Published on: December 22, 2023

Solution to Certified Reference Material recipe challenge

Catherine A Rimmer1, Melissa M Phillips

  • 1Chemical Science Division, National Institute of Standards and Technology, 100 Bureau Drive, Stop 8392, Gaithersburg, MD 20899-8392, USA. Catherine.rimmer@nist.gov

Analytical and Bioanalytical Chemistry
|August 28, 2013
PubMed
Summary

No abstract available in PubMed .

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