Many methods have been used for determining the base exchange capacity of soils and certain advantages have been claimed by each investigator for his particular method. Fewer studies on the base exchange reactions of organic matter have been made and the nature of the material makes many of the methods used for soils impracticable and inaccurate when applied to organic matter. According to McGeorge (1) the monovalent lignin salts are soluble in alcohol and the use of alcohol in base exchange studies on organic matter is of questionable value. The removal of excess soluble salt from the base exchange complex preparatory to determining the amount of base fixed, by the use of water, allows too great a hydrolysis of monovalent salts and, therefore, will lead to low results. Then again, the monovalent lignin salts are soluble under certain conditions in salt solution, and especially in acetate solutions which hydrolyze and yield OH ions.
Proceedings of the Iowa Academy of Science
©1936 Iowa Academy of Science, Inc.
Millar, H. C.; Smith, F. B.; and Brown, P. E.
"A Method for Determining the Exchange Capacity of Organic Matter in the Presence of Nitrogen and Calcium,"
Proceedings of the Iowa Academy of Science, 43(1), 161-167.
Available at: https://scholarworks.uni.edu/pias/vol43/iss1/28