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The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Link to relevant study record(s)

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).