Abstract
ABNORMALLY high cation exchange capacities (40–70 m.equiv./100 gm.) have been reported for halloysite1. Since isomorphous substitution is of inconsiderable magnitude in halloysite, White2 has suggested that allophane, which sometimes is associated with halloysite, may account for these large values. The recent work of Wada3, however, shows that salts of potassium and ammonium can replace H2O from between the layers of hydrated halloysite and form heat-stable complexes with the clay. The amount of salt so held is large (200–300 m.equiv./100 gm.).
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References
Grim, R. E., “Clay Mineralogy” (McGraw-Hill, New York, 1953). Kerr, P. F., et al., Amer. Petrol. Inst. Research Proj. 49, Prelim. Rep. 7, 91 (1951).
White, W. A., Amer. Mineral., 38, 634 (1953).
Wada, K., Amer. Mineral., 44, 153 (1959).
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THOMAS, G. Salt Desorption from Halloysite. Nature 184, 1746 (1959). https://doi.org/10.1038/1841746b0
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DOI: https://doi.org/10.1038/1841746b0
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