A calibration system that fits the kinetic paths of formation of A1:F complexes is used here to investigate the speciation of Al in solutions prepared with large organic solutes of soil obtained by ultrafiltration of lysimeter water collected at monthly intervals in a forest stand of Picea abies in Solling. In addition, the same soil was used to obtain water equilibrium extracts that were investigated using the same technique for Al species. The results corresponding to the soil extracts are expressed in the form of profiles describing the concentration of various Al ionic species and their ligands; the results obtained indicate that organic ligands play a dynamic and quantitatively important role in defining the Al speciation in this soil. The technique presented here seems convenient to investigate the ligation and transport of Al in acid soils.
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