Abstract
Sediment porewaters were recovered by the membrane dialysis technique from Kejimkujik Lake and Mountain Lake in Nova Scotia and analyzed for pH, dissolved organic carbon (DOC), total (acid soluble) aluminum, total reactive monomeric aluminum (TRM-Al), organic monomeric aluminum and inorganic monomeric aluminum. The results show that in the colored lake water (Kejimkujik), close to 100% of the TRM-Al fraction is bound to organic matter and that 10 to 60% of the total-Al is in the monomeric form. In the clearwater lake (Mountain), 50 to 65% of TRM-Al fraction is associated with organic matter and less than 4 to 5% of the Total-Al is in the monomeric form. The concentrations of reactive monomeric species in organic-rich porewaters decrease with time of storage due to the precipitation of organo-Al compounds. Model calculations using the porewater profiles for Al suggest that the sediment can be an important source of dissolved Al to the overlying water.
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