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Conductometric Titration of Soils for Cation-Exchange Capacity¹

ABSTRACT

The reaction of barium-saturated soil with the sulfate anion of a standardized titrating solution to form insoluble barium sulfate is utilized for determining soil cation-exchange capacity. The endpoint of the reaction is determined by conductometric titration. Specific conductance remains comparatively constant while the barium on the exchange complex is being titrated. After the barium has been titrated, conductance increases as increments of the titrating solution are added. The endpoint of the reaction is obtained from the intersection of the two linear portions of the curve. Cation-exchange capacity data obtained by this method are compared with data obtained by other methods on the same soils.

¹ Joint contribution of Department of Agronomy, Wyoming Agr. Exp. Sta., and B.P.I.S.A.E., U. S. Dept. of Agriculture. Published with permission of Director as Journal Paper No. 39. Presented before Div. II, Soil Science Society of America, Dallas, Tex., Nov. 18, 1953.

² Former Assistant Professor of Agronomy, University of Wyoming, now Assistant Professor of Soil Science, Michigan State College; and former Agent, Soil Scientist BPISAE, now Assistant Professor of Agronomy, University of Wyoming, respectively.

Received for publication November 24, 1953.