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EC number: 231-072-3
CAS number: 7429-90-5
Environmental distribution of a substance is mainly driven by the
adsorption potential. The potential of aluminium for adsorption to
sediment and soil particles is mainly driven by its speciation and the
concentration of dissolved organic carbon (DOC).
Aluminium speciation is very complex and changes significantly
with the pH.In the absence of organic
matter, Al3+is the predominant aluminium species at low pH
(less than 5.5). As pH increases above 5.5, aluminium-hydroxide
complexes formed by hydrolysis become increasingly important and
dominate aqueous aluminium speciation. The presence of a moderate amount
of organic matter in soft water results in organically complexed
aluminium being the dominant aluminium form when the pH is between 4 and
7. Above pH 7, anionic aluminium hydroxide predominates.
The DOC and the pH are also affecting the
adsorption and desorption of aluminium to organic particles. For
evaluation of adsorption at different pH-levels a chemical simulation
was performed. As a result it can be concluded that the potential for
adsorption is low at different pH-levels. Approximately 8% of the total
aluminium were bound to particles with was further reduced to < 1% at
pH-values > 7 (at soft and hard water). Log Kd-values of 3 - 5 were
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