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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

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.

Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Link to relevant study record(s)

Description of key information

ErC50= >100 mg/L; ErC10 = 92.6 mg/L; NOEC = 66.7 mg/L

Key value for chemical safety assessment

EC10 or NOEC for freshwater algae:
92.6 mg/L

Additional information

Algal growth inhibitionto the unicellular freshwater green alga Pseudokirchneriella subcapitata was has been investigated according to OECD/EU test methods. The substance was found to inhibit the growth after 72 hours exposure. The EC50 values for inhibition of specific growth rate (ErC50) and yield (EyC50) being >100mg/L. EC10 values for inhibition of specific growth rate (ErC50) was 92.6 mg/L and yield (EyC50) was 74.7mg/L.NOEC was determined to be 66.7 mg/L. The test substance rapidly hydrolyses in water yielding the di-acid degradation product that significantly affected pH. A limit test conducted at a concentration of 100 mg/L and with adjustment of pH had no significant effects on growth of the algae.

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.