The purpose of this work was to determine the colloidal content of certain soils and to make analyses of the inorganic colloids extracted from these soils. These soils ranging from a pH of 5.53 to a pH of 7.60 were obtained and the total colloidal content determined. The inorganic colloids were then extracted according to Truog and Drosdorff's procedure (2) and analyzed for total SiO2 , Al2O3 , Fe2O3 , TiO2 , P2O5 and available K2O. The total SiO2, Fe2O3, Al2O3 and TiO2 were determined by Hillebrand's method (1). The phosphorus content was determined by the magnesium nitrate method. The available K2O was determined by the Aspergillus niger method.
Proceedings of the Iowa Academy of Science
©1935 Iowa Academy of Science, Inc.
Dean, H. C.; Smith, F. B.; and Brown, P. E.
"The Composition of Inorganic Colloids Extracted from Three Iowa Soils,"
Proceedings of the Iowa Academy of Science, 42(1), 103-104.
Available at: https://scholarworks.uni.edu/pias/vol42/iss1/35