Registration Dossier
Registration Dossier
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EC number: 200-296-3 | CAS number: 56-89-3
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
The test item L-Cystine had no acute toxic effects on Pseudokirchneriella subcapitata up to its solubility limit in the test water under the present test conditions.
Key value for chemical safety assessment
Additional information
The test item had no statistically significant inhibitory effect on the growth of the algae during the test period of 72 hours at the loading rate of 100 mg/L (results of Student t-tests, one-sided smaller, α = 0.05). The loading rate of 100 mg/L was, therefore, determined to be the 72 -hour NOEC. This value might even be higher, but concentrations of the test item exceeding the loading rate of 100 mg/L were not tested, in accordance with the test guidelines. The 72 -hour LOEC was above the loading rate of 100 mg/L. In conclusion, the test item L-Cystine had no acute toxic effects on Pseudokirchneriella subcapitata up to its solubility limit in the test water under the present test conditions (OECD 201). At the loading rate of 100 mg/L, the algal growth (average growth rate and yield) was not inhibited (but enhanced) compared to the control after 72 hours of test duration.
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