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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

EC50 (72 h, biomass): 207 mg/L (Scenedesmus subspicatus)
EC50 (72 h, growth rate): > 345.4 mg/L (Scenedesmus subspicatus)

Key value for chemical safety assessment

Additional information

No study available on potassium silicate. Data are read-across to sodium silicate. Sodium silicate (MR 3.0, 34.54 wt%) was tested on the algae Scenedesmus subspicatus, in a GLP guideline study according to German standard method DIN 38412, part 9, which corresponds to OECD guideline 201 (Rieche 1995). The 72 h EC50 based on biomass was 207 mg active matter/L at pH 8.2 - 9.5. The EC50 for growth rate was determined as > 345.4 mg active matter/L, the highest concentration tested.