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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The 96 hour median effective concentration (EC50) was 25 mg/L when calculated using cells/mL, and 79 mg/L when determined using the average specific growth rate. The 96 hour no observed effect concentration (NOEC) is 8.1 mgIL when determined using the number of cells/mL and 16 mg/L when determined using the average specific growth rate.

Key value for chemical safety assessment

EC50 for freshwater algae:
79 mg/L
EC10 or NOEC for freshwater algae:
16 mg/L

Additional information

The acute 96h toxicity of the water accommodated fraction (WAF) of the test material to freshwater alga, Selenastrum capricornutum, was determined in a study performed to OECD Guideline 201.

The test was performed at 24 ± 1°C under static conditions with a control (0 mg/L) and five concentrations of WAF (8.1, 16,32,64, and 110 mg/L). The dilution water was sterile enriched media adjusted to a pH of 7.5 ± 0.1.

Exposure of the algae to the test substance resulted in the following growth after 96 hours:

control - 3010000 avg. cells/ml

8.1 mg/l - 2853000 avg. cells/ml (95% of control)

16 mg/l - 2640000 avg. cells/ml (88% of control)

32 mg/l - 878000 avg. cells/ml (29% of control)

64 mg/l - 377000 avg. cells/ml (13% of control)

110 mg/l - 69000 avg. cells/ml (2% of control)

The 96 hour median effective concentration (EC50) was 25 mg/L when calculated using cells/mL, and 79 mg/L when determined using the average specific growth rate. The 96 hour no observed effect concentration (NOEC) is 8.1 mgIL when determined using the number of cells/mL and 16 mg/L when determined using the average specific growth rate.