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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

Toxicity to aquatic algae: EC50 - > 6.9 mg/L; NOEC - 3.9 mg/L

Key value for chemical safety assessment

EC50 for freshwater algae:
6.9 mg/L
EC10 or NOEC for freshwater algae:
3.9 mg/L

Additional information

Algal growth inhibition has been investigated in a 72 hour test according to OECD/EU test methods.The EC50 values for inhibition of specific growth rate (ErC50) and yield (EyC50) was >6.9 mg/L. The NOEC for inhibition of specific growth rate (ErC0) and yield (EyC0) was 3.9 mg/L. In accordance with ECHA guidance on information requirements and chemical safety assessment, Chapter R.7b: Endpoint specific guidance, the ErC50 endpoint is used in DNEL derivation. This is because use of values based on biomass cannot be applied to an analysis of results from a system in exponential growth without logarithmic transformation.

(Q)SAR estimation indicates an EC50 of 0.418 mg/L, lower than the experimentally determined value.

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