Registration Dossier

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

EC50values of greater than 0.018 mg/l and correspondingly the No Observed Effect Concentration was considered to be equal to or greater than 0.018 mg/l.

Key value for chemical safety assessment

EC50 for freshwater algae:
0.018 mg/L

Additional information

A study was perford to assess the effect of the test item on the growth of the green algaDesmodesmus subspicatus.  Thethod followed that described in the OECD Guidelines for Testing of Chemicals (2006) No 201, "Freshwater Alga and Cyanobacteria, Growth Inhibition Test" referenced as Method C.3 of Commission Regulation (EC) No 440/2008.

Exposure ofDesmodesmus subspicatusto the test item gave EC50values of greater than 0.018 mg/l and correspondingly the No Observed Effect Concentration was considered to be equal to or greater than 0.018 mg/l.

Analysis of the test preparations at 0 and 72 hours showed measured test concentrations to range from 0.017 to 0.019 mg/l (approximately 75% of the nominal test concentration). It was considered that the differences observed in the measured test concentration obtained during the media preparation trial and definitive test were due to slight variances in the stirring speed and temperature of the saturated solution. As no decline in measured concentration was observed over the 72-Hour test period it was considered appropriate to base the results on the 0-Hour mean measured test concentration only.

This study showed that there were no toxic effects at saturation.