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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

Toxicity testing with algae resulted in an EC50 value of 2500 mg/L for growth rate and an EC10 of 41 mg/L for growth rate. 

Key value for chemical safety assessment

EC50 for freshwater algae:
2 500 mg/L
EC10 or NOEC for freshwater algae:
41 mg/L

Additional information

One study for toxicity to aquatic algae is available on a structurally related compound according to OECD Guideline 201.

In this key study, an eluate of silicic acid, calcium salt (Shieldex AC3) was tested for effects on Scenedesmus subspicatus in a geometric series of 5 concentrations, resulting in an EC50 of 2500 mg/L for growth rate and an EC50 of 410 mg/L for biomass, respectively (Lebertz 1999).

A NOEC value could not be determined, since the lowest concentration of 100 mg/L still showed effects on growth rate and biomass. However, the EC10 values were reported as 41 mg/L (growth rate) and 33 mg/L (biomass), respectively, and could be used for this purpose (as mentioned in OECD 201).