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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

Two studies on Pseudokirchneriella subcapitata have been conducted according to OECD Guideline 201. Results are somewhat different. We will retain results of MoE 1998 (ECr50-72h = 31.2 mg/L, NOECr = 24.8 mg/L) instead of those of Brixham lab 1993 (ECr50-72h = 130 mg/L, NOECr = 26 mg/L) as in the later there is a complete loss of test material measured at test end.

Key value for chemical safety assessment

EC50 for freshwater algae:
31.2 mg/L
EC10 or NOEC for freshwater algae:
24.8 mg/L

Additional information

Two studies on Pseudokirchneriella subcapitata have been conducted according to OECD Guideline 201. Results are somewhat different. We will retain results of MoE 1998 (ECr50-72h = 31.2 mg/L, NOECr = 24.8 mg/L) instead of those of Brixham lab 1993 (ECr50-72h = 130 mg/L, NOECr = 26 mg/L) as in the later there is a complete loss of test material measured at test end.

An investigation with a series of 12 marine species (fish, invertebrates, several algae) gave no indication of a higher sensitivity of marine species. To the contrary, LC/EC50 values and NOECs tended to be higher than the corresponding freshwater data.