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Boron Sorption on Composted Organic Matter

Inst. of Soils and Water, Agriculture Research Organization, The Volcani Center, Bet Dagan, Israel

Y. Chen^*

The Seagram Center for Soil and Water Sciences, Faculty of Agriculture, P.O. Box 12, Hebrew Univ. of Jerusalem, Rehovot 76:100, Israel

*Corresponding author.

ABSTRACT

Boron (B) sorption on composted organic matter at various pH levels and ionic strengths was determined. The compost contained 158 g kg^–1 of humic acid and 56 g kg^–1 of fulvic acid fractions, totaling 21.4% of the organic matter. At pH 8, the amount of sorbed B increased by about 57% with an ionic strength increase from 0 to 0.15 M. For solutions of CaCl₂ at concentrations lower than 5 x 10^–3 M, the effect of CaCl₂ on B sorption was negligible. Sorption isotherms of B on organic matter were determined at pH levels of 7.0, 7.9, and 8.9. The sorption increased with increasing B concentration in solution and pH.

A comparison with literature data for clays shows that sorption of B on organic matter at similar pH levels and total B concentration is significantly higher than on clays. A modified Langmuir equation was fitted to the measured data. Based on the isotherms, sorption coefficients were derived and used to calculate the predicted dependence on pH of B sorption on organic matter at various total B levels. Desorption studies of B from organic matter at pH 8 and increasing levels of sorbed B exhibited strong hysteresis effects and the sorbed B was removed to a partial extent only. The formation of dihydroxy and/or hydroxy-carboxy binding of borate to humic substances and/or carbohydrates is proposed to be the sorption mechanism. These bonds may explain the limited irreversibility of the process.

Contribution from the Seagram Center for Soil and Water Sciences, The Faculty of Agriculture, The Hebrew Univ. of Jerusalem, Rehovot, Israel and from the Inst. of Soils & Water, Agriculture Research Organization, The Volcani Center, Bet Dagan, Israel. No. 1987 Series.

Received for publication May 14, 1987.

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