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Kinetics of Post-reclamation Boron Dissolution¹

ABSTRACT

The <0.25-mm particle size fractions of four natively high boron (B) soils were reacted in suspension with a B-specific exchange resin. By separating the resin from the suspension after selected times of reaction, four subsamples of each soil were obtained, representing increasing degrees of reclamation. The subsamples were reacted with deionized water and release of residual B to the supernatant was measured as a function of time. The data for each soil subsample were plotted according to an integrated form of the Elovich reaction rate equation. The release of B from the soils closely conformed to a linear function of the natural logarithm of time. Linear regression analysis was used to calculate the reaction rate constants for each treatment. The rate of post-reclamation B dissolution and the equilibrium concentrations of regenerated B were inversely related to the amount of B removed from each soil during reclamation.

¹ Contribution from the Dep. of Soil and Environmental Sciences, Univ. of California, Riverside.

² Graduate Fellow and Professor of Soil Science, respectively, Univ. of California, Riverside; and Research Leader (Soil and Water Chemistry), U.S. Salinity Laboratory, Riverside. The senior author is currently Postdoctoral Research Associate, Dep. of Agronomy and Soils, Washington State Univ., Pullman.

Received for publication June 11, 1984. Accepted for publication January 22, 1985.

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