Registration Dossier
Registration Dossier
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EC number: 939-383-2 | CAS number: -
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
The substance is acutely toxic to the algae.
Key value for chemical safety assessment
Additional information
A study was performed according to OECD 201 and GLP using Scenedesmus subspicatus (CIBA-GEIGY Ltd. 1993c). The test concentrations were 0.41, 1.23, 3.7, 11, 33 and 100 mg/L. Due to the low solubility an emulsifier was used. The 72-h EC50 (biomass) of the test substance was determined to be 2.42 mg/L (nominal). Although the EC50 is above the determined water solubility of the test item, the value is used as worst case for classification and risk assessment.
A second range finding study was conducted according to OECD 201 using Scenedesmus subspicatus (RCC Umweltchemie GmbH & Co. KG 1995). However, the study is not reliable since a very large amount of emulsifier was used (100 mg/L in all test concentrations) and the pH value increased more than 1.5 units from the beginning to the end of the test.
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