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Diss Factsheets

Ecotoxicological information

Toxicity to birds

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
long-term toxicity to birds
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:

Description of key information

The performance of a study investigating the toxicity of aluminium sodium silicates towards birds was waived based on the generally high tolerance and natural abundance of SiO2, silicates and aluminium as minerals in soil.

Key value for chemical safety assessment

Additional information

No study with synthetic amorphous aluminum sodium silicate is indicated, based on the generally high tolerance and the natural abundance of SiO2 and silicates as minerals in soil. In fact, silicon is the second most abundant element in the earth’s crust mass (approx. 28 %) after oxygen. It appears as complex silicate minerals in soils and sediments, as the oxide (silica, SiO2) in crystalline form in rocks, soils and sand, and as biogenic silica in organisms such as diatoms, and in plants such as grass, rushes, rice or sugar cane. Synthetic amorphous silica and silicates released into the environment are expected to combine indistinguishably with the soil or sediment due to their similarity with inorganic soil/sediment matter and will be subjected to natural processes under environmental conditions (cation exchange, dissolution, sedimentation). The same applies to aluminium which is the third most abundant element (approx. 8%) in the earth's crust. Given the natural abundance of silica, silicates and aluminium, aluminium sodium silicate is unlikely to affect birds in a harmful way. There is no data available to suggest that aluminium sodium silicate is hazardous to birds. Furthermore, when chickens were fed a diet that contained less silicon dioxide than normal, their bone formation was harmed. Silicon is therefore considered an essential trace element for the chick (Carlisle E, Science 178(4061) 619 -621, 1972).