Abstract
SEVERAL opinions have been expressed regarding the mechanism of inorganic chromatographic adsorption on activated alumina. Schwab1 ascribes the cation adsorption to a permutite sodium ion/cation exchange produced by sodium ions which may be present in alumina as impurities. The adsorption of several cations as hydroxides or basic salts has been ascribed to the alkaline reaction of technical alumina. According to Jacobs and Tomkins2, an exchange process, involving hydrogen ions or a hydrolytic adsorption, by a reaction of the type: must be eliminated, since both lead to a considerable increase in acidity which has not been verified.
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References
Schwab, G. M., and co-workers, Z. angew. Chem., 50, 546 (1937); 50, 691(1937); 51, 709(1938); Z. phys. Chem., (B), 53, 1 (1942); Z. anorg. allg. Chem., 252, 321 (1944).
Jacobs, P. W. M., and Tomkins, F. C., Trans. Farad. Son., 41, 388, 395, 400 (1945).
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SACCONI, L. Surface Buffer Action of Alumina in Inorganic Chromatography. Nature 164, 70–71 (1949). https://doi.org/10.1038/164070b0
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DOI: https://doi.org/10.1038/164070b0
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