Registration Dossier
Registration Dossier
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EC number: 200-795-6 | CAS number: 73-22-3
Toxicity to microorganisms
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.
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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