HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Lin, C. Articles by Coleman, N. T. Search for Related Content PubMed Articles by Lin, C. Articles by Coleman, N. T. Agricola Articles by Lin, C. Articles by Coleman, N. T.

The Measurement of Exchangeable Aluminum in Soils and Clays¹

ABSTRACT

The 1N salt leaching of Al-saturated soils and clay samples or of acid subsoil materials with native ion saturations resulted in the displacement of Al⁺⁺⁺ions in amounts close to the exchange capacity for the Al-saturated materials and near capacity minus exchangeable Ca + Mg for the acid subsoils. Prolonged leaching with neutral salt solutions did not displace quantities of Al significantly larger than those which were present on exchange sites. Acidified salt solutions, on the other hand, continued to dissolve Al. One normal solutions of KCl, CaCl₂ and NaCl removed the same amounts of Al from a number of soils and clays, so long as the leaching was sufficiently exhaustive. For limited leaching, KCl was the most effective displacing agent and NaCl the least.

Potentiometric titrations of some Al-saturated or naturally acid soils and clays to pH6 in 1N KCl consumed quantities of base equivalent to the Al displaced by salt-leaching or determined by conductimetric titration. With other soils, containing mostly kaolin minerals and iron oxides, the acidity which could be titrated was significantly larger than the amount of Al which could be displaced.

¹ Taken in part from a thesis presented by the senior author to the Graduate Faculty, North Carolina State College, 1959. Published with the approval of the Director, North Carolina Agr. Exp. Sta., as Paper No. 1126 in the Journal Series. Presented before Division II, Soil Science Society of America, Nov. 16, 1959, at Cincinnati, Ohio.

² Former Research Assistant, present address Agronomy Dept., Iowa State Univ., and Professor of Soils, respectively.

Received for publication February 19, 1960. Accepted for publication May 11, 1960.

This article has been cited by other articles:

				D. G. KINNIBURGH Towards more detailed methods for quantifying the acid susceptibility of rocks and soils Journal of the Geological Society, July 1, 1986; 143(4): 679 - 690. [Abstract] [PDF]