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 Google Scholar Google Scholar Articles by Aomine, S. Articles by Jackson, M. L. Search for Related Content PubMed Articles by Aomine, S. Articles by Jackson, M. L. Agricola Articles by Aomine, S. Articles by Jackson, M. L.

Allophane Determination in Ando Soils By Cation-Exchange Capacity Delta Value¹

ABSTRACT

One sample of H₂O₂-treated, iron oxide-extracted soil is treated with 2% Na₂CO₃ solution for 60 minutes and another with NaOAc of pH 3.5 for 15 minutes, at boiling. Both samples are washed with neutral NaOAc and the cation-exchange capacity is determined with Ca replaced with NaOAc. The difference obtained between the two samples is referred to as the "cation-exchange capacity delta value," and averaged 100 me. per 100 g. for allophane from Ando soils of Japan developed on rapidly weathered volcanic ash and in some allophanes of Ross and Kerr. For example, the allophane content of fine clay of an Ando soil containing predominantly halloysite determined by delta value was 23.8% compared to 21.4% by water contents of constituent minerals.

¹ This contribution from the Department of Soils was supported in part by the Research Committee of the University of Wisconsin, Madison, through a grant of funds from the Wisconsin Alumni Research Foundation; the first author is grateful for a Fellowship extended to him by the Rockefeller Foundation, New York. Presented before Div. II and V, Soil Science Society of America, Lafayette, Ind., Aug. 7, 1958.

² Professor of Soils, Kyushu University, Fukuoka, Japan; and Professor of Soils, University of Wisconsin, Madison, respectively.

Received for publication September 25, 1958. Accepted for publication October 31, 1958.