Registration Dossier
Registration Dossier
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EC number: 234-448-5 | CAS number: 12004-14-7
Bioaccumulation: aquatic / sediment
Administrative data
Link to relevant study record(s)
Description of key information
Due to its chemical nature Ettringite is not stable under natural environmental conditions. The main degradation products are calcium sulfate (dihydrate) with limited solubility resulting in free calcium and sulfate ions and insoluble aluminium hydroxides and insoluble aluminium oxides (at neutral pH range).
Bioaccumulation in organisms is not relevant for calcium and sulphate ions. Bioconcentration of aluminium in fish is a function of the water quality (e.g. pH and total organic carbon). Estimated steady state bioconcentration factors (BCFs) for aluminium were 215 at pH 5.3, 123 at pH 6.1 and 36 at pH 7.2.
Key value for chemical safety assessment
Additional information
Due to its chemical nature Ettringite is not stable under natural environmental conditions. The main degradation products are calcium sulfate (dihydrate) with limited solubility resulting in free calcium and sulfate ions and insoluble aluminium hydroxides and insoluble aluminium oxides (at neutral pH range).
Calcium and sulfur are essential elements for living organisms. Thus, bioaccumulation in organisms is not relevant for calcium and sulfate ions.
Bioconcentration of aluminium in fish is a function of the water quality (e.g. pH and total organic carbon). Cleveland et al. (1991) maintained brook trout (Salvelinus fontinal) in water containing 200 µg/L total aluminium at pH values of 5.0, 6.0 and 7.2 for 56 days. Estimated steady state bioconcentration factors (BCFs) for aluminium were 215 at pH 5.3, 123 at pH 6.1 and 36 at pH 7.2, respectively. The estimated time to reach a 90% steady state was 1.5 days at pH 5.3, 4.2 days at pH 6.1 and 1.7 days at pH 7.2. These data demonstrate that the BCFs are inversely related to pH. Elimination during the 28-day depuration phase was more rapid at pH 5.3 than at pH 6.1 or 7.2. The biological half-life of aluminium in brook trout was 0.46 day at pH 5.3, 1.26 day at pH 6.1 and 0.52 day at pH 7.2.
Based on the data available, aluminium is considered to have a low bioaccumulation potential to aquatic organisms under circum neutral conditions. In the acidic aquatic environment, aluminium demonstrates a moderate bioaccumulation potential.
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