Abstract
ACCORDING to Stutman et al. (ref. 1 and preceding communication), the absorption band at 3,400 cm.−1 of the infra-red spectra obtained with several synthetic phosphates correspond to the stretching frequency of O–H belonging to acid phosphoric groups linked by hydrogen bonds. We disagree with this interpretation, and we have already stated2 that this band is due to adsorbed water. It is well known, indeed, that the apatitic calcium phosphates obtained by precipitation contain a large amount of firmly adsorbed water which slowly escapes when they are heated up to about 700° C., as may be seen on the thermogravimetric curves3.
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References
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WINAND, L., DALLEMAGNE, M. Hydrogen Bonding in the Calcium Phosphates. Nature 193, 369–370 (1962). https://doi.org/10.1038/193369a0
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DOI: https://doi.org/10.1038/193369a0
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