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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

Freshwater algal 96hr NOEC - 9.3 mg/L (OECD 201)

Key value for chemical safety assessment

EC50 for freshwater algae:
36 mg/L
EC10 or NOEC for freshwater algae:
9.3 mg/L

Additional information

Harlan study No. 41104031 to OECD 201 and GLP the freshwater algal NOEC, based on growth rate, was 9.3 mg/L at both 72 hrs and 96 hrs. The ErC₅₀ was 36 mg/L at 72 hrs and 42 mg/L at 96 hrs.

The preferred observational endpoint in this study is algal growth rate inhibition because it is not dependent on the test design (see Guidance on information requirements and chemical safety assessment Chapter R.7b: Endpoint specific guidance v1.1). Thus the 72 hr ErC₅₀ is used for classification purposes.