Abstract
The mass spectrometric measurement of isotopes is based on the separation of isotopes with different masses, and was used as an early method for isotope separation. Isotopic separation by ultracentrifuges is commercially applied for production of (highly) enriched isotopes. Originally this method was developed for uranium isotope separation (enrichment), but nowadays it is used for other isotope enrichment for scientific or commercial purpose. Attempts were made to separate H2 from D2 in Pd-black-containing columns, but no complete separation could be obtained by break-through experiments. A gas adsorption chromatographic column filled with molecular sieves 5Ǻ (Linde molecular sieve) and cooled with liquid nitrogen was used for separation of H2, HD, and D2.
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