Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
Reaction mass of trisodium bis[5-amino-2-(hydroxy-κO)-3-{[1-(hydroxy-κO)-2-naphthyl]diazenyl-κN1}benzenesulfonato(3-)]chromate(3-), trisodium bis[2-(hydroxy-κO)-3-{[1-(hydroxy-κO)-2-naphthyl]diazenyl-κN1}-5-nitrobenzenesulfonato(3-)]chromate(3-) and heptasodium bis[4-(hydroxy-κO)-3-{[2-(hydroxy-κO)-5-nitro-3-sulfophenyl]diazenyl-κN2}-6-(4-sulfoanilino)naphthalene-2-sulfonato(5-)]chromate(7-)
EC number: 944-619-2 | CAS number: -
Toxicity to aquatic plants other than algae
Administrative data
Link to relevant study record(s)
Description of key information
ErC50 > 102 mg/l a.i. based on frond number and dry weight
Key value for chemical safety assessment
Additional information
The growth inhibitory effects of the test item to the duckweed Lemna minor were investigated according to test guideline OECD 221, under static conditions over a period of 7 days.
The test solutions were prepared by respective dilutions of a stock solutionin Swedish Standard medium.
The test was performed at 162, 51.3, 16.2, 5.13 and 1.62 mg/l nominal concentration of the test item, corresponding to100, 31.6, 10, 3.16 an d 1.0 mg/lof the active ingredient.
Three parallel test vessels were used for each test concentration of the test item and six vessels for the blank controls.
The test concentrations during the 7-day test period were determined by photometry at the beginning of the test, as well as after 3, 5 and 7 days of exposure. These analyses confirmed the right dosage of the test item and indicated that the concentrations of the test item were stable over the whole 7-day period, but that the two lowest concentrations were not within 80-120 % of the nominal concentrations. Therefore, the effective concentrations (ErC50and EyC50) were assessed based on the geometric mean (GM) of the measured concentrations of the active ingredient.
The two endpoints frond number and biomass (dry weight) were investigated at days 3, 5 and 7 and each of them were assessed as growth rate and yield.
The 7-day ErC50 (based on frond number) of the test item on the duckweed Lemna minor is > 102 mg/l. This value is based on the measured concentrations of the active ingredient.
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.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
