Separation methods for the determination of colloidal material in soils have been eliminated by microscopic analysis, and proof of the existence of secondary reactions has cast doubt on many of the so-called adsorption methods. An adsorption method depending upon measurement of the partition coefficients for dye with alcohol and chloroform has been devised. The soil is saturated with dye from water, dried, extracted to equilibrium with chloroform, again dried and extracted with alcohol. The color in the alcohol is a measure of the colloidal surface. The method is simple and eliminates secondary reactions.
Proceedings of the Iowa Academy of Science
©1924 Iowa Academy of Science, Inc.
Moses, D. Verne
"Determination of the Colloidal Materials in Soils,"
Proceedings of the Iowa Academy of Science, 31(1), 285-285.
Available at: https://scholarworks.uni.edu/pias/vol31/iss1/75