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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

The acute toxicity of the test material to the freshwater fish rainbow trout (Oncorhynchus mykiss) has been investigated and gave a 96-Hour LC50 of gretaer than 0.80 mg/l. Correspondingly the No Observed Effect Concentration was 0.80 mg/l.

Key value for chemical safety assessment

LC50 for freshwater fish:
0.8 mg/L

Additional information

Preliminary solubility work and analysis showed that a test concentration of 0.80 mg/l, a proportion of the test material remained undissolved. Therefore, analysis was performed on samples of filtered and unfiltered test media during the definitive study. The filtered samples indicated the concentration of test material in solution and hence bioavailable to the tets fish.

Analysis of the fresh and old test media preparations over the 96 hour study duration showed the measured concentrations to be within the range of 80% to 101% of nominal for the unfiltered test media (a single exception was noted) and within the range of 1% to 16% of nominal for the filtered test samples.

The measured concentrations of the unfiltered media indicate both the amount of dispersed and dissolved test material in the test system, whereas the measured values from the filtered media show the amount of test material which was in solution and hence bioavailable to the test fish. It was therefore considered appropriate to base the results on the time-weighted mean measured test concentrations of the filtered test media in order to give a "worst case" analysis of the data.