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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

Short term toxicity data for silicon is not available. Instead, results on soluble silica is available and will be used as a supporting information on conclusions that dissolved silica does not have acute toxic ef-fects in fish at <  100 mg/l exposure level.
The solubility of monomeric silicic acid is known to be ca. 120-140 mg/l at neutral pH and room temperature at equilibrium. Solubility increases as pH increases. If the solubility limit is exceeded, colloid forming polymerization of silica is the consequence. The formed colloids have influence on test species and acute lethal effects have observed in fish e.g. injury of gill filaments.It is unlikely that aqute effects were seen in short term tests of elemental silicon, since the element is very slowly soluble and it would take long time to reach an equilibrium state in test solutions.

Key value for chemical safety assessment

LC50 for freshwater fish:
100 mg/L
LC50 for marine water fish:
100 mg/L

Additional information

Test results are not available for silicon. Read across/WoE aproach is used instead. Silicon has no environmental classification and therefore all LC50 values are expected to be > 100 mg/l. For CSA and PNEC derivation purposes LC50 for fresh water and marine fish are set to 100 mg/l.