Modeling the Concentration of Aluminum in Surface Waters |
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Authors: | Sullivan Timothy J Cosby B J |
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Institution: | 1. E&S Environmental Chemistry, Inc., P.O. Box 609, Corvallis, OR, 97339, U.S.A 2. Department of Environmental Sciences, University of Virginia, Charlottesville, VA, 22903, U.S.A
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Abstract: | Although the increased mobilization of aluminum from soils to surface waters is widely recognized as one of the most important ecological effects of acidic deposition, lumped-parameter mathematical models of acidification response typically overestimate the change in Al concentration under changing deposition by a considerable margin. The assumption of equilibrium with gibbsite (Al(OH)3) in the MAGIC model and other models of acid-base chemistry is shown to be inconsistent with measured values for a large variety of lake and stream databases. A modified algorithm for predicting Al concentration, based on empirical relationships evident in field data, provided superior estimates of changes in Al concentration in three long-term monitoring data sets and under experimental conditions at two experimental watershed manipulation sites. |
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