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EC number: 231-130-8
CAS number: 7440-21-3
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.
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
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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