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Long-term toxicity to aquatic invertebrates

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Key value for chemical safety assessment

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Testing for long-term toxicity to invertebrates is not considered necessary because:

·       The substance reacts violently with water therefore ecotoxicity testing would be too hazardous.

·       Short-term toxicity of the degradation products to invertebrates is low.

·       The substance hydrolyses rapidly to hydrogen chloride and silanediol. Silanediol reacts further to give monosilicic acid, Si(OH)4, and amorphous polysilicic acid. The effects of hydrogen chloride are limited to pH effects and not relevant in correctly buffered media. Silicic acid is a naturally-occurring substance which is not harmful to aquatic organisms at relevant concentrations. Silicic acid is the major bioavailable form of silica for aquatic organisms and plays an important role in the biogeochemical cycle of silicon (Si).