Registration Dossier
Registration Dossier
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EC number: 266-719-9 | CAS number: 67564-91-4
Endpoint summary
Administrative data
Description of key information
Fenpropimorph has shown to be not readily biodegradable according to OECD guideline 301 F.
Additional information
Biodegradability
In the key study fenpropimorph showed to be poorly biodegradable according to OECD guideline 301 F. The degradation of fenpropimorph in different water/sediment and soil systems has been tested further to assess the fate of fenpropimorph in the natural aquatic and terrestrial environment.
Degradation in water/sediment systems
Fenpropimorph has a low water solubility and a high adsorption coefficient, which leads to a fast movement into the sediment. Within the sediment, fenpropimorph is oxidised to the metabolite fenpropimorph-acid, which has a much better solubility and a weaker adsorption. Therefore fenpropimorph-acid moves back to the water phase and is mainly found in it. It can further be metabolized and the final mineralisation to CO2 to 6% to 8% of the applied radioactivity is significant. In the water phase, this main metabolite reached maximum amounts of about 23% / 17% TAR (System A/B). In the sediment, fenpropimorph-acid appeared only at the last three sampling times and only in amounts <8% TAR. Since the radioactivity in the water phase first decreases, but then increases again, it can be assumed that at least a major part of the fenpropimorph-acid was formed in the sediment and moved back into the water.
The mean DT50 value of fenpropimorph in the water phase was determined to be 2.65 days (3.4 days in System A, 1.9 days in System B). In the sediment a DT50 value of 83.6 days was determined (83.6 days in System A, no estimation was possible in System B). The mean DT50 value for the whole system was 36 days (18 days in System A, 54 days in System B).
For the main metabolite fenpropimorph-acid a DT50 value of 79.7 days in water was determined (120.7 days in System A, 38.7 days in System B).
Degradation in soil systems
Fenpropimorph is aerobically degradable in a sandy loam with a DT50 of 12.5 days according to OECD guideline 307 (2004/1022507). The main metabolite fenpropimorph-acid occurred with max. 7.8% TAR at 10 DAT in the soil treated with the morpholine labeled test item and with max. 9.7% TAR after 14 DAT in the soil treated with the phenyl labeled test item. The DT50 value for the metabolite fenpropimorph-acid was determined to be 4.1 days.
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