Registration Dossier
Registration Dossier
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EC number: 278-636-5 | CAS number: 77182-82-2
Endpoint summary
Administrative data
Description of key information
Additional information
Hydrolysis:
Glufosinate-ammonium is hydrolytically stable.
Photolysis:
Glufosinate-ammonium is photolytically stable in water and on soil.
Ready biodegradability:
Glufosinate-ammonium (GA) was shown to be not ready biodegradable in a modified Sturm test (Voelskow, 1995) according to the OECD guideline 301 B (1992). The degradation of glufosinate-ammonium in different water/sediment and soil systems has been tested further to assess the fate of glufosinate-ammonium in the natural aquatic and terrestrial environment.
Biodegradation in water and sediment:
In water/sediment systems glufosinate-ammonium is rapidly degradable with a geometric mean DegT50 of 8.7 days in total system, so that no risk of persistence or accumulation in surface water occurs. However, additionally the degradation of 14C-glufosinate-ammonium was investigated in a pelagic-water study at 20 °C. The half-life was estimated to be 54.3 days. This value is considered as worst-case figure due to the lack of microbial activity based on the absence of the sediment phase.
Biodegradation in soil:
Glufosinate-ammonium mineralises rapidly in soil to considerable amounts of CO2. An overall geometric mean normalised half-live of glufosinate-ammonium of 6.5 days was calculated based on laboratory aerobic soil degradation data. The degradation in soil is rapid even at low temperature (DT50 = 18 d at 10°C). The main soil metabolites, PPO (AE F065594), MPP (AE F061517) and MPA (AE F064619), degrade rapidly under laboratory conditions. No risk of persistence or accumulation of glufosinate-ammonium or its metabolites in soils is foreseen.
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