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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.
EC number: 947-395-4 | CAS number: -
Toxicity to aquatic plants other than algae
Administrative data
Link to relevant study record(s)
Description of key information
ErC50 (Lemna minor, 7d, frond number) > 100 mg/L (nominal)
Key value for chemical safety assessment
- EC50 for freshwater plants:
- 100 mg/L
Additional information
This study was performed in order to evaluate the toxicity of tehe test item towards Lemna minor following the OECD Guideline 221 (2006). The study was performed using 5 concentrations ranging from 4.6 to 100 mg/L. Incubation time was 7 days. The frond number of each replicate was determined at the beginning, at day 2 and 5 during the test and at the end of the experiment. Additionally, the dry mass of 12 representative fronds was determined at the beginning of the experiment. At the end of the experiment the dry mass of each replicate was determined. Growth rate µ and the yield were determined from the frond number and the drymass at the respective observation times.
Significant inhibition of plant growth was observed at the following concentrations: 10 (only yield dry mass), 22, 46 and 100 mg/L.
At the start and at the end of the test, the content of the test item in the test solutions was determined using photometer.
The measured concentrations lay between 94 % and 100 % of the nominal concentrations at the beginning of the test and between 92 % and 103 % of the nominal concentrations at the end of the test. Therefore, the determination of the results was based on the nominal concentration.
For the estimation of the EC50s of the test item, the fits showed sufficient statistical correspondence of the data with the dose-response-equation.
The 7d-EC50s of the positive control were determined in a separate reference test. The values lay within the desired range.
The pH of the blankcontrolshould not vary by more than 1.5 units. The change was 1.2 units in the blank control.
All validity criteria were met.
No observations were made which might cause doubts concerning the validity of the study outcome. The result of the test can be considered valid.
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.
