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The role of humic acid on sulfate retention and release in a podzol |
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| Authors: | F. Courchesne G. R. Gobran A. Dufresne |
| Affiliation: | 1. Département de Géographie, Univ.de Montréal, Succ. Centre-Ville, C.P. 6128, H3C 3J7, Montréal, Canada 2. Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences, Box 7072, S-750 07, Uppsala, Sweden 3. Les Laboratoires Savoie Dufresne, Suce. Outremont, C.P. 927, H2V 4R8, Montréal, Canada |
| Abstract: | Sequential leaching experiments were performed to evaluate the effects of humic acid (HA) and pH on SO4 retention and release in a Swedish podzolic B-horizon. Results showed that the presence of HA reduced SO4 retention and that HA was released when SO4 was retained. Increasing HA concentration increased the rate of SO4 release. The ability of HA to compete with SO4 increased with pH. More than 40% of total sorbed SO4 was irreversibly retained. |
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