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 is hydrolytically stable at pH 3, 5, 7 and 9 at 25°C.
It can be stated that fenpropimorph is photolytically stable. No photolytical half-life of fenpropimorph was calculated.
Additional information
Fenpropimorph is hydrolytically stable at pH 3, 5, 7 and 9 at 25°C.
It can be stated that fenpropimorph is photolytically stable. No photolytical half-life of fenpropimorph was calculated.
Phototransformation in soil:
An available study (BASF DocID: 1988/0433) covers the guideline 161-3 of the Pesticide Assessment Guidelines, Subdivision N, (U.S.) Enviromental Protection Agency, Washington, DC. and was performed in accordance with GLP principles.
The aim of the study was to provide data on the photolytic dissipation of the active ingredient and on the nature and persistence of products, which may be formed upon irradiation of soil surface. For the experiment a loamy sand was choosen and natural sunlight was simulated by using a Xenon lamp for irradiation.
Extractability of radioactive material decreased with irradiation time. The parallel increase of non-extractable material indicated formation of various products sorbed to the soil irreversibiy.
Upon irradiation the amount of the active ingredient fenpropimorph decreased from 97.61 % i.TRR at the beginning of the experiment down to 50.9 % i.TRR after 30 days. In the non-irradiated sample, 98.38 % i.TRR of fenpropimorph could be recovered after the same irradiation time.
First half-life of the active ingredient could be estimated graphically to be 30 days, corresponding to a degradation constant of k = 0.023 d-1.
After one day of irradiation formation of the oxidation product BF 421-13 started. Its amount reached a level of 9.34 % i.TRR at the end of the experiment; its formation, however, slowed down after 8 days of irradiation.
Additionally, the photolysis product BF 421-15 occured in minor quantities after 4 days of irradiation. No time dependent change of its concentration (4.81 - 6.54 % i.TRR) could be observed within the experiment.
At termination of the experiment 11.9 % i.TRR were non-extractable residues.
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