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Sediment toxicity

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Description of key information

Based on the justification of the three main components, it can be concluded:
Aluminium, aluminium powders and aluminium oxide are non hazardous (not classified for the environment). Aluminum (Al) is the most commonly occurring metallic element, comprising eight percent of the earth's crust (Press and Siever, 1974) and is therefore found in great abundance in both the terrestrial and sediment environments.
The equilibrium partitioning method is not applicable to calcium oxide, since its effect is caused by the hydroxyl ions (pH effect). The fate and behaviour of these ions is determined by the pH buffer capacity of the sediment rather than a partitioning coefficient (Kd).
Magnesium oxide (MgO) is exempted from registration according to EC 1907/2006 Annex V Section 10.

Key value for chemical safety assessment

Additional information

There are no studies available for “Reaction product of thermal process between 1000°C and 2000°C of mainly aluminium oxide and calcium oxide based raw materials with at least CaO+Al2O3+MgO >80% , in which aluminium oxide, magnesium oxide and calcium oxide in varying amounts are combined in various proportions into a multiphase crystalline matrix”. As this substance is an UVCB substance with aluminium oxide (AL2O3), calcium oxide (CaO) and magnesium oxide (MgO) as main constituents, justification based on these main components were taken into account by read across following a structural analogue approach.

Aluminium-compounds:

Aluminium, aluminium powders and aluminium oxide are non hazardous (not classified for the environment). Aluminum (Al) is the most commonly occurring metallic element, comprising eight percent of the earth's crust (Press and Siever, 1974) and is therefore found in great abundance in both the terrestrial and sediment environments. Concentrations of 3-8% (30,000-80,000 ppm) are not uncommon. The relative contributions of anthropogenic aluminium to the existing natural pools of aluminium in soils and sediments is very small, and therefore, not relevant either in terms of added amounts or in terms of toxicity. Based on these exposure considerations, additional sediment and/or soil testing is not warranted. More information about exposure based waiving for aluminium in soil and sediments can be found in attached document (White paper on exposure based waiving for Fe and Al in soils and sediments final 15-03-2010. pdf, see attachment).

Calcium-compounds:

In accordance with column 2 of REACH Annex VII there is no need to consider testing, since CSA indicates no need to investigate further effects on sediment organisms. Furthermore, the equilibrium partitioning method is not applicable to calcium oxide, since its effect is caused by the hydroxyl ions (pH effect). The fate and behaviour of these ions is determined by the pH buffer capacity of the sediment rather than a partitioning coefficient (Kd).

Because the sediment is expected to be more buffered than the water column, higher effect concentrations can be expected for sediment organisms. Furthermore, the substance will be present in its dissociated form in the natural aquatic environment. The ions will react with HCO3- to form water and carbonate ions which react with Ca2+ to form calcium carbonate. Calcium carbonate precipitates and deposits on the sediment. Calcium carbonate is a constituent of natural soils.

Magnesium oxide:

Magnesium oxide (MgO) is exempted from registration according to EC 1907/2006 Annex V Section 10.

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