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Titration of H-Clay Suspensions With Salt Solutions¹

ABSTRACT

A procedure is suggested by which H-clay free of both exchangeable aluminum and soluble acids can be prepared from Wyoming bentonite (KWK Volclay). H-clay obtained by this procedure was titrated with NaOH and sodium salts of boric, acetic, formic and nitrous acids. Titration with sodium tetraborate gave the permanent negative charge on montmorillonite particles both when this clay contained exchangeable aluminum and when it did not. Titration with the salts of the other acids gave the permanent negative charge of this clay only in the absence of exchangeable aluminum. The negative slope of the first segment of the conductivity curve obtained in the neutralization of H-clay with NaOH was very gradual, whereas, the corresponding slopes for both soluble strong acids and H-clays reported by most other investigators are very steep. This contrast in slope is a direct result of the very low salt contents of clay suspensions converted to H-clay in this study.

Key Words: H-clay—preparation • titrations with salt solutions • H-montmorillonite—preparation

¹ Agronomy Paper No. 676, New York State College of Agriculture, Department of Agronomy, Cornell University, Ithaca, New York.

² Former Graduate Assistant and Professor of Soil Science respectively, Department of Agronomy, Cornell University, Ithaca, New York.

Received for publication January 18, 1967. Accepted for publication April 7, 1967.