Alteration of allophane and imogolite by alkaline digestion

  title={Alteration of allophane and imogolite by alkaline digestion},
  author={Victor Farmer and B. F. L. Smith and J. Mervyn Tait},
Since digestion of imogolite or allophane in 5~ NazCO3 at 95~ for periods of 2-100 h leads to solid products different in structure and composition from the starting materials, the procedure is unsuitable for selective dissolution of reactive silica- alumina gels from complex clay mixtures. Cold 5~ Na2COa does not alter these clays, but effects partial solution, the extent of which depends on the degree of dispersion of the clay and the ratio of solids to solution.