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EC number: 931-597-4
CAS number: -
Experimental Al application (4.8 g m-2) resulted in a 1-cm thick Al
layer on the sediment surface of the treated cores. The content of
particulate Al equalled that of control after 4 months, while
concentrations of dissolved Al equalled the control after two weeks.
Biofilm was found to have a stabilizing effect on resuspension of Al.
This maybe because Al floc structure may become better crystallized, or floc
aged for 2–4 months may have surface areas matching more
crystallized Al forms, or Al flocs may become stabilized and successive
incorporated in the biofilm or Al may form complexes with humic matter which
can further enhanced the stabilization.In general, added Al undergoes
hydrolysis and polymerisation leading to size growth and agglutination
of the floc stabilizing the sediment surface. This process is disordered
by increasing pH. An elevated pH leads to higher dissolved Al concentrations,
as Al(OH)3 only dominates at pH 6–8 whereas higher pH leads to
dissolution of the floc.
Behaviour of aluminium in aquatic environment was studied in laboratory
in non-GLP, non-guideline study. Al2(SO3)4 was added to intact sediment
core samples simultaneously with fresh suspended particulate matter to
mimic sedimentation of lake water. This mixture was gently added to the
cores without disturbing the sediment surface. Two cores were left as
control cores not treated with Al. An open erosion chamber (microcosm)
was used for determining resuspension and lake water was continuously
pumped through it by a peristaltic pump. Concentrations of dissolved Al
and particulate Al were determined. The content of particulate Al
equalled that of control after 4 months, while concentrations of
dissolved Al equalled the control after two weeks. Biofilm was found to
have a stabilizing effect on resuspension of Al. Even though Al was
mobile and easy to resuspend during the first days and weeks after
treatment the floc stability increases within 2–4 months to the same
level as natural lake sediment.
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