Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Toxicity to microorganisms

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Not required

Key value for chemical safety assessment

Additional information

According to REACH Regulation (Annex VIII, 9.1.4, column 2) the study on respiration inhibition of activated sludge does not need to be done if the substance is readily biodegradable. L-Tryptophan proved to be readily biodegradable and fulfilling the 10-d-window criterion (77% biodegradation after 28 d). In the toxicity control of the ready biodegradability test containing both test and reference item (20 mg/L each) 75% biodegradation based on ThCO2 occurred within 14 d thus indicating that the test item was not inhibitory to the inoculum at the concentration tested. Based on these results, the study on respiration inhibition of activated sludge seems not necessary.