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This article in SSSAJ

  1. Vol. 26 No. 6, p. 547-551
    Received: Feb 12, 1962
    Accepted: Mar 1, 1962

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Ionic Properties of Mica Surfaces1

  1. L. L. McDowell and
  2. C. E. Marshall2



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.

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