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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Administrative data

Link to relevant study record(s)

Description of key information

The test item L-Cysteine had no acute toxic effects on Daphnia magna up to its solubility limit in test water under the test conditions.
The EC50 is > 100 mg/L.

Key value for chemical safety assessment

Additional information

The acute toxicity of the test item L-Cysteine to Daphnia magna was determined in a 48 hour semi-static test according to the EU Commission Directive 92/69/EEC, Part C.2, the Commission Regulation (EC) No. 440/2008, Part C.2 and the OECD Guideline for Testing of Chemicals, No. 202 (2004).

A limit test was performed in accordance with the test guidelines to demonstrate that the test item has no toxic effect on the test organisms up to and including a nominal concentration of 100 mg/L. Thus, the only nominal concentration tested was 100 mg/L. Additionally, a control group was tested in parallel. In the control and at the test item concentration of 100 mg/L, no immobilized test organisms were observed during the test period of 48 hours.