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Published in Soil Sci Soc Am J 26:547-551 (1962)
© 1962 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Ionic Properties of Mica Surfaces1

L. L. McDowell and C. E. Marshall2

ABSTRACT

Seven micas were studied; muscovite, rose muscovite, phlogopite, margarite, biotite, lepidomelane, and a vermiculite-biotite. Curves connecting selectivity number Ks with surface cationic composition were obtained for Li-Na, Li-Rb, Li-Cs, Ba-Ca, and Ba-Sr exchange equilibria. The polyfunctional character of the surfaces is well shown in the monovalent series. Cesium is held less firmly than rubidium at biotite, vermiculite-biotite and lepidomelane surfaces, and more firmly only in the case of phlogopite. Margarite is entirely different from the other micas, in showing a high bonding for lithium, and an order NH4 < Cs < Na < K < Rb. Potentiometric results, using clay membrane and silver electrodes, were obtained for Na+, Ag+ and Ca++ in 0.5% suspensions of the micas. The bonding energy curves also show the polyfunctional character of mica surfaces.

NOTES

1 Contribution from the Missouri Agr. Exp. Sta. Columbia, Journal Series No. 2393. Approved by the Director. Experimental materials taken from the Ph.D. thesis of L. L. McDowell, University of Missouri, 1960. Presented before Div. II, Soil Science Society of America, Nov. 30, 1961, at St. Louis, Mo.

2 Soil Scientist, USDA, ARS, University of Mississippi, State College, and Professor of Soils, University of Missouri, Columbia, respectively.

Received for publication February 12, 1962. Accepted for publication March 1, 1962.






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