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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 428-040-8 | CAS number: 138261-41-3
Endpoint summary
Administrative data
Description of key information
DT50 = 10.7 - 1271 days, degradation in water recalculated to 12 °C
DT50 = 29.7 – 412.5 days, degradation in sediment recalculated to 12 °C
DT50 = 399.1 days to >1 year, degradation in soil recalculated to 12 °C
Additional information
No study on ready biodegradability is available for imidacloprid. However, since higher tier studies on the biodegradation of imidacloprid in water, sediment and soil are available no additional study on ready biodegradability is necessary. The PBT assessment and environmental classification can be derived based on the available higher tier studies.
Degradation half-life of (2E)-1-[(6-chloropyridin-3-yl)methyl]-N-nitroimidazolidin-2-imine in water ranged from 10.7 - 1271 days (recalculated to 12 °C), significantly influenced by the exposure to light. Highest mineralization was recorded for the test system “sterile, light exposed” with 26.2% of the applied radioactivity after 366 days.
Degradation half-lifes of the test substance under aerobic and dark conditions in water/sediment systems were 76.4, 328.5 and 412.5 days (recalculated to 12 °C), covering 3 different sediments. After test termination 66.9 % (after 92 days), 8.2 % (after 30 days) and 16.1 % (after 92 days) of the initially applied radioactivity was bound to the sediment as non-extractable residues. Under anaerobic and dark conditions the degradation half-life of the test substance was found to be 69.1 and 60.4 days (recalculated to 12 °C). In the latter study, 68.9 % of the initially applied radioactivity was bound to the sediment as non-extractable residues after 366 days. After 92 days of incubation 2.0 and 1.7% of the applied radioactivity were mineralized.
Simulation tests on the biodegradation in soil, under aerobic conditions and continuous darkness, revealed a half-life of the test substance of 526.5 days, 723.9 days, 399.1 days and >1 year with 21.5 %, 25.1 %, 21.6 % and 16.7 % of the test substance bound as non-extractable residues after 100 days. The substance attained 6.3 – 6.5% mineralization at test termination (100 days). Hence, formation of non-extractable residues in soil and sediments under aerobic or anaerobic conditions represents an important dissipation pathway of the tested substance.
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.
