Registration Dossier
Registration Dossier
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EC number: 202-615-1 | CAS number: 97-88-1
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
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.
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