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Toxicity to soil microorganisms

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toxicity to soil microorganisms
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study scientifically not necessary / other information available
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Description of key information

The performance of a study investigating the toxicity of aluminium sodium silicates towards soil microorganisms was waived due to the 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 indicated, based on 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.