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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

Toxicity figure based on river water testing.

Key value for chemical safety assessment

EC50 for freshwater algae:
1.87 mg/L
EC10 or NOEC for freshwater algae:
0.51 mg/L

Additional information

The toxicity to algae test was conducted according to approved guidelines with GLP accreditation with deviations reported and justified. A certificate of analysis was present and chemical analysis in keeping with the bulk approach was conducted with a validated analytical method. Validity criteria and guideline reccomendations for a valid test were met with the exception of chemical analysis at the end of the test. Some fluctuation in analytical results was also seen and 80 % recovery in the stock and highest 2 concentrations were achieved but not in the lower test concentrations due to the nature of the test substance( interaction with suspended matter DOC in the test water). These are considered acceptable short comings as they would also occur to a greater extent environmentally. Such Deviations from the guideline for this type of chemical are acceptable. This test can be considered reliable without restrictions.

The following results were obtained:

EC10 (72 -h): 0.99 mg/L (growth rate)

EC50 (72 -h): 1.87 mg/l (growth rate)

EC10 (72 -h): 0.31 mg/L (biomass)

EC50 (72 -h): 0.84 mg/L (biomass)

NOEC (72 -h): 0.51 mg/L (growth rate)

LOEC (72 -h): 1.63 mg/L (growth rate)

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