Registration Dossier
Registration Dossier
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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.
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