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Boron Adsorption by Montmorillonite as Affected by Particle Size¹

ABSTRACT

The effect of clay particle size on B adsorption by the Na and Ca forms of montmorillonite was determined at two pH levels. Boron adsorption by the smaller clay particles of both Na and Ca forms was much greater than by the larger clay particles at both pH levels. The increase in B adsorption in the smaller clay particle systems was related to the increase in the edges' surface area of the clay platelets. Data from batch experiments were compared with results computed according to fitted adsorption coefficients (maximum B adsorption and affinity coefficients which related to the binding energy). The agreement between calculated values and experimental results indicates that the adsorption model can be used to predict B adsorption by Na- and Ca-montmorillonite at various particle sizes.

¹ Contribution from the Institute of Soils and Water, Agricultural Research Organization, The Volcani Center, Bet Dagan 50–250, Israel. No. 746-E 1983 series. This research was supported by a grant from the United States-Israel Binational Science Foundation (BSF), Jerusalem, Israel.

² Soil Scientist, Institute of Soils and Water, ARO, The Volcani Center; and Agricultural Economist, Div. of Statistics and Experiment Design, ARO, The Volcani Center, respectively.

Received for publication May 4, 1984. Accepted for publication December 12, 1983.