Abstract
The speciation of aluminium in an acidic stream, draining a spruce plantation-forest in Mid-Wales, is examined using an established model based on an equilibrium thermodynamic approach. Trivalent aluminium and aluminium complexes with fluoride, with dissolved organic matter and with silica were abundant: aluminium hydroxy-fluorides and sulphates were much less so. There is a large scatter in the results, primarily due to variations in stream water chemistry at a given pH, rather than to an effect of temperature. It is concluded that aluminium silica complexes can be an important part of the total dissolved aluminium concentration: at pHs > 5, they comprise typically 20% of the total dissolved aluminium in the stream water.
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