Registration Dossier

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

A study was performed to assess the effect of the test item on the growth of the green alga Desmodesmus subspicatus following OECD Guideline 201. No efects were observed at a nominal test concentration of 0.32 mg/L (0.065 mg/L measured), the highest attainable test concentration that could be attained due to abiotic (and possibly biotic) degradation properties of the test substance. As no effects were found at the highest concentration attainable, no EC50 or NOEC can be provided for this endpoint

Key value for chemical safety assessment

Additional information

The study was performed to assess the effect of the test item on the growth of the green alga Desmodesmus subspicatus following OECD Guideline 201 and having due regard to the amount of auxiliary solvent permitted in the test under the OECD Guidelines. Based on the geometric mean measured test concentrations, exposure of the alga to the test item gave EC50 values of greater than 0.065 mg/l and correspondingly the NOEC was considered to be 0.065 mg/l, the maximum attainable concentration under the conditions of the test. However, these values were a result of unavoidable loss of test substance due to abiotic (and possibly biotic) degradation of the test substance under the conditions of the assay and, as no effects were observed over the entire test, they cannot be used to derive an EC50 or a NOEC.