Registration Dossier
Registration Dossier
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EC number: 402-140-1 | CAS number: 17865-32-6 CHMMS; CHMS; DYNASYLAN 9407; Z-6187
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
(0-24-h) EC50 45 mg/l (mixture of parent substance and hydrolysis product) Scenedesmus subspicatus, reliability 1
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 45 mg/L
- EC10 or NOEC for freshwater algae:
- 12.5 mg/L
Additional information
A 24 h ErC50 nominal value of 45 mg/l has been determined for the effects of the test substance on growth rate of Desmodesmus subspicatus (formerly: Scenedesmus subspicatus). A 72-h EbC50 nominal value of 35 mg/l and NOEC of 12.5 mg/l have also been determined for effects on area under the growth curve. The test substance hydrolyses in water and it is likely that the test organisms were exposed to a mixture of the parent substance and the hydrolysis products of the substance, because the study was conducted under a static regime.
It was not possible to determine geometric means in this study since the test substance was <LOQ at the end of the 72 hours study. It is thought that the higher temperature required for this study, as well as the elevated pH (pH 7.8 - 8.0, start of test; 9.8 - 10.2, end of test) will have accelerated the hydrolysis half-life of the substance.
This is the only study report available for this endpoint and has been selected as key.
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