Aluminum geochemistry at the catchment scale in watersheds influenced by acidic precipitation / by Dean S. Jeffries and William H. Hendershot.: En13-5/87-132E-PDF

"The geochemistry of aluminum in surface and sub-surface waters is discussed for catchments affected by acidic deposition using, as examples, the Turkey Lakes Watershed (central Ontario, Canada) and the St. Hippolyte calibrated basins (southern Quebec, Ontario). The roles played by water pathways (i.e. hydrology) and soil chemistry in determining the concentration of aluminum in the waters are first summarized, followed by presentation of results from the 2 studies. Specifically, the spatial and temporal variability observed for total aluminum and its species in the waters is discussed, with particular attention being given to elucidating the biogeochemical factors present in each of the basins that can explain the variability. The springmelt episode is discussed in detail, since this period exhibits dramatic peaks in aluminum concentration that may be toxic to aquatic biota. Results from the 2 Canadian basins are placed in a geographically wider context through comparison with those reported for other basins in the United States, Scandanavia, and central Europe"--Abstract.

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