Registration Dossier
Registration Dossier
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EC number: 225-969-9 | CAS number: 5188-07-8
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 15 mg/L
- EC10 or NOEC for freshwater algae:
- 4.15 mg/L
Additional information
Pseudokirchneriella subcapitatawere exposed to sodium methanethiolate for 72 hours at nominal concentrations of 0, 0.5, 1, 5, 10, 50 and 100 mg a.i./L in a test conducted according to OECD TG 201 (Gancetet al., 2004b). Cell density was significantly reduced at the nominal concentrations of 10, 50 and 100 mg/L. The measured concentrations were 0, 0.63, 1.13, 5.95, 10.96, 48.12 and 87.81 mg a.i./L on Day 0 and 0, 0.33, 0.59, 2.84, 4.96, 20.48, and 35.31 mg a.i./L at 72 hours. The 72-hr EC50was 6.3 mg/L for biomass and 15 mg/L for growth rate. The corresponding 72-hr NOECs were 0.81 (biomass) and 4.11 mg/L (growth rate). All effect values were based on mean measured concentrations.
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