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 Keren, R. Search for Related Content PubMed Articles by Keren, R. Agricola Articles by Keren, R.

Effects of Titration Rate, pH, and Drying Process on Cation Exchange Capacity Reduction and Aggregate Size Distribution of Montmorillonite Hydroxy-Aluminum Complexes¹

ABSTRACT

The effects of rate of titration of montmorillonite + AICI₃ with NaOH, and of drying on CEC reduction, C-axis spacing, and aggregate size distribution of montmorillonite hydroxy-Al complexes at the pH range of 5–10, were studied. The CEC reduction was found to be influenced by the titration rate. While the CEC of the montmorillonite was 0.92 meq/g, the CEC of the clay hydroxy-Al complexes was 0.27, 0.31, 0.39, and 0.45 at titration rates of 0.025, 0.1, 0.4, and 0.8 meq NaOH/min, respectively. The mean aggregate size and the C-axis spacing of the clay hydroxy-Al complexes decreased as the pH of the suspensions increased. The CEC of the montmorillonite hydroxy-Al complexes after drying was higher than the nondried systems at a pH above 7.5, whereas no difference was observed at the lower pH range (pH 5–6). The CEC and the C-axis spacing for both the dried and nondried systems were highly correlated.

¹ Contribution from the Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel. no. 224-E, 1979 series.

² Soil Scientist.

Received for publication March 3, 1980. Accepted for publication June 16, 1980.