Abstract
WE have measured the vapour pressure of H218O ice in the temperature range −5° to −20° C in order to determine the fractionation factor of 18O between ice and vapour. Water enriched with 18O was supplied by the Research and Development Co. Ltd, of the Weizmann Institute of Science, Israel, in the form of D218O with an 18O content of 97 per cent. To convert D218O into H218O, D218O was vaporized in vacuo and reacted with metallic iron at 500° C. The evolved D2 gas was removed through a palladium-leak. When the reaction was complete, the iron oxide containing 18O was reduced by circulating ordinary H2 gas at 500° C to produce H218O which was trapped by cooling with dry ice. As much as 96 per cent of deuterium was replaced with protium by one run (deuterium analysis was carried out by Showa Denko Co. Ltd), and the process was repeated twice to secure complete replacement.
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References
Matsuo, S., Kuniyoshi, H., and Miyake, Y., Science, 145, 1454 (1964).
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MATSUO, S., MATSUBAYA, O. Vapour Pressure of H218O Ice. Nature 221, 463–464 (1969). https://doi.org/10.1038/221463a0
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DOI: https://doi.org/10.1038/221463a0
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