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Certified Reference Material IAEA-446 for radionuclides in Baltic Sea seaweed

M K Pham1, M Benmansour2, F P Carvalho3

  • 1International Atomic Energy Agency (IAEA), Environment Laboratories (EL), MC 98000, Monaco.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|December 3, 2013
PubMed

Keywords:
Certified Reference MaterialQuality Assurance/Quality ControlRadionuclidesSea weed (Fucus vesiculosus)

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Chemical Shift: Internal References and Solvent Effects01:17

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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...