Registration Dossier
Registration Dossier
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EC number: 235-487-0 | CAS number: 12251-53-5
Bioaccumulation: terrestrial
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
Due to its chemical nature sodium aluminate is not stable under environmental conditions. The main degradation products are sodium hydroxide and various aluminium species subject to the prevailing environmental conditions, for instance pH regime.
With respect to NaOH bioaccumulation is not considered relevant. If emitted to soil, sorption to soil particles will be negligible. Depending on the buffer capacity of the soil,will be neutralised in the soil pore water or the pH may increase. The relevant compound to consider with regard to terrestrial bioaccmulation is aluminium.
Aluminium is the most abundant metallic element in the Earth's crust, with a proportion of around 8% by weight, and the third most abundant of all elements. Due to its reactive nature it does not exist in nature as free elemental metal, rather it occurs in hundreds of different minerals. Based on its ubiquitous occurrence existing data clearly demonstrate that the present natural background concentration far outweighs anthropogenic contributions of aluminium to the terrestrial environment, i.e. to soils and subsoils. A census of the available data reveals that the relative contribution of anthropogenic aluminium to the natural occurring aluminium in soils and subsoils is negligible.
Exposure of soil dwelling organisms and plants to aluminium of geogenic and anthropogenic origin is expected to be high. However, it is known that the bioavailablity of aluminium is low and that the excretion of aluminium is fast. Therefore, bioaccumulation of aluminium is rarely observed in nature (WHO, 1997). Thus the risk of terrestrial bioaccumulation of aluminium is expected to be low.
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