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EC number: 939-460-0 | CAS number: 1471311-26-8
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
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.
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