SSSAJ Journal of Natural Resources and Life Sciences Education
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Published online 21 October 2009
Published in Soil Sci Soc Am J 73:1988-1994 (2009)
DOI: 10.2136/sssaj2009.0103
© 2009 Soil Science Society of America
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SOIL CHEMISTRY

Boron Transport in Soils as affected by Dissolved Organic Matter in Treated Sewage Effluent

R. Keren* and G. Communar

Institute of Soil, Water and Environ.Sciences, The Volcani Center, Agricultural Research Organization (ARO), P.O. Box 6, Bet Dagan 50250, Israel

* Corresponding author (rkeren{at}agri.gov.il).

Interaction of effluent dissolved organic matter (DOM) with native soil organic matter (OM), B complexation with DOM, and adsorption of B by soil all play an important role in assessing B transport in soil. However, no information is available yet on the impact of these reactions on B mobility in soil. The objective of the present study was to evaluate the effect of B-DOM complexation on B mobility in soils irrigated with treated effluents. Soil column displacement experiments were conducted to measure the B mobility in the presence of DOM extracted from municipal treated sewage plants. To describe B transport in the presence of DOM, a traditional multicomponent transport model was used. The model took into account the B-DOM-soil reactions (obtained from batch experiments). It was observed that the presence of OM molecules in soil solution enhanced B transport in soil due to B-OM complexation. The concentration of this complex in soil solution increases with the concentration of the dissolved OM (from both effluent and native soil).The model simulated well the effect of DOM on B transport in soil.

Abbreviations: BTC, breakthrough curve • CDE, convection-dispersion equation • DOM, dissolved organic matter • OC, organic carbon • OM, organic matter






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