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Ecotoxicological information

Toxicity to soil microorganisms

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Description of key information

This endpoint has been waived for aluminium and ammonium which are both integral part of the soil matrix and ubiquitous in nature.

Key value for chemical safety assessment

Additional information

This endpoint has been waived for aluminium because aluminium is an integral part of the soil mineral matrix. Furthermore, it is the most abundant metallic element, comprising 8 % of the earth crust. It is a major component of almost all common inorganic soil particles. Dissolved aluminium is present in soil pore water at very low concentrations, varying with pH. This is common textbook knowledge, not requiring further elaboration. In view of the high natural abundance of aluminium in the soil matrix the hypothetical contribution of AlN releases to Al concentrations in soil can be considered to be negligible by qualitative assessment. Hazards to terrestrial organisms due to AlN hence can be excluded.

In addition, this endpoint has been waived for ammonia for exposure considerations. The ionized form ammonium is part of the natural soil compartment and part of the environment. It is furthermore used as fertilizer in large amounts. The un-ionized form ammonia is much more toxic than ammonium but it is a gas and it is also naturally occurring. Both molecules are part of the nitrogen cycle and rapidly transformed.