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Registration Dossier
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EC number: 900-722-4 | CAS number: -
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Methanol: EC50: 20300 - 43290 mg/L
TGK: 8000 mg/L
KOH: waiving
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 22 000 mg/L
Additional information
The toxicity threshold of methanol for the alga Scenedesmus quadricauda after an exposure of 8 days was reported to be at 8000 mg/L (Bringmann and Kuehn, 1978). EC50 reported by Stratton (1987) with different test species of blue-green algae range between 20300 - 43290 mg/L. The average concentration causing 50% inhibition in growth rate was found to be at 28400 mg/L during an exposure period of 10 – 14 days (Stratton and Smith, 1988). Cho et al. (2008) in a 96h test period report a concentration causing 50% inhibition in growth rate of 22000 mg/L for the green algae Selenastrum capricornutum in a 96h well documented test conducted according to OECD 201 Guideline.
Potassium hydroxide is a strong alkaline substance that dissociates completely in water to K+ and OH- (OECD SIDS potassium hydroxide, 2002). Therefore, the only posssible effect would result from the pH effect. However pH will remain between environmentally expected ranges.
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