Open AccessThe adsorption of substances by fuller's earth
Publication year - 1931
Publication title -
proceedings of the royal society of london. series b, containing papers of a biological character
Language(s) - English
Resource type - Journals
eISSN - 2053-9185
pISSN - 0950-1193
DOI - 10.1098/rspb.1931.0029
Subject(s) - adsorption , alkalinity , chemistry , alkaline earth metal , inorganic chemistry , oxalic acid , ion , hydrogen , alkali metal , nuclear chemistry , organic chemistry
Propionic and hexoic acids are not adsorbed by fuller's earth to any extent at anyp H . Oxalic acid is adsorbed in solutions more alkaline thanp H 1.5. The adsorption rises to a maximum at aboutp H 4 and then falls off very gradually with increasing alkalinity. Atp H 12 the adsorption is about three-quarters of its maximum value. The adsorption ofn -propylamine andn -butylamine is influenced by acidity in almost exactly the same way. In both cases the adsorption rises from a vanishingly small value in very acid solution to aboutp H 4.5. Fromp H 4.5 to aboutp H 8 the adsorption is almost independent of the hydrogen-ion concentration. In solution more alkaline thanp H 9.5 there is a very rapid rise in the adsorption to a maximum atp H 11, which is immediately followed by a rapid fall to a vanishingly small value atp H 13.