NMR METHOD FOR DETERMINING ORGANIC LOADING OF CHARCOAL.
NAVAL RESEARCH LAB WASHINGTON D C
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A proton NMR nuclear magnetic resonance method has been developed for determining the organic loading on adsorbent type charcoals. The NMR procedure compares in accuracy with the steam-desorption method, but it requires only a two-gram charcoal sample and a simple room-temperature carbon tetrachloride extraction. Certain contaminants and classes of contaminants may be identified directly from the NMR spectrum of the extract. The study employed 14 samples from the main carbon filters of nuclear submarines, whose organic loadings had been previously determined by the steam-desorption method. Generally, NMR appears to be preferable to steam desorption for determining organic loading. However, since the NMR method does not detect fully halogenated compounds, it should not be used alone if unusually large concentrations of these contaminants are suspected. The use of this method is restricted to a shore-based installation, since the size and weight of an NMR spectrometer preclude the use of this instrumentation aboard a submarine or spacecraft. Author
- Organic Chemistry
- Nuclear Physics and Elementary Particle Physics