Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Biodegradation in water: screening test

The ready biodegradability of the test substance was examined in a study (BASF SE, 39483, 2014) according to the OECD 301 B (CO2 evolution, modified Sturm test). The degree of biodegradation after an exposure period of 28 days was < 10 % CO2/ThCO2 in this test. The test substance was found to be not readily biodegradable under the test conditions. 

 

Biodegradation in water and sediment: simulation test

The degradation of the radiolabeled test substance was investigated in a study (BASF Crop Protection, 394794, 2013) according to OECD 308 (2002) in aerobic water/sediment systems under dark conditions.  The DT50 values for the parent compound in the water phase were ≤ 3 days. In the sediment, parent DT50 values were determined to be 121-371 days. For the whole system, DT50 values of 76 to 86 days were calculated.

Also under anaerobic aquatic conditions, the test substance redistributed quickly from the water phase to sediment (water phase DT50 9-13 days) (BASF Crop Protection, 394786, 2015).

Degradation of the parent occurred in the total system with DT50 values of 35-45 days.

 

Biodegradation in soil

A key study (BASF SE, 394788, 2015) was conducted according to OPPTS 835.4100 (2008). The test substance degraded quickly in two soils when incubated under aerobic conditions at a soil moisture of 40% of the maximum water holding capacity and a temperature of 20°C. Best-fit DegT50(degradation DT50) values in soil LUFA 2.2 (pyranone label), soil LUFA 2.2 (pyranone/pyridine label), NJ soil (pyranone label) and NJ soil (pyranone/pyridine label) for the test substance were 6.4 days (FOMC), 6.1 days (FOMC), 11.3 days (FOMC) and 4.0 days (FOMC), respectively. The DegT90 values ranged from 50.5 to 115.8 days.