Registration Dossier
Registration Dossier
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EC number: - | CAS number: -
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
EC50 = 320 mg/L nominal value
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 320 mg/L
- EC10 or NOEC for freshwater algae:
- 320 mg/L
Additional information
The modified test to measure the real toxic effect has demonstrated that the observed growth inhibition effect of the test substance on Scenedesmus subspîcatus was caused in a high degree (> 50 %) due to the indirect effect, the light absorption in the coloured test solutions. Thus, the 72-hours EµC 50 and EbC 50 for Reactive Orange 16 could be determined to be clearly higher than 320 mg test substance/L when based on the real toxic effect. The literature study result (Novotný 2005) has been disregarded since it doesn't take into account the light shading effect of the coloured substance. This effect has been also confirmed on the similar substance 2.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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