Registration Dossier
Registration Dossier
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EC number: 936-023-6 | CAS number: 950782-86-2
Endpoint summary
Administrative data
Description of key information
Additional information
The overall environmental fate profile indicates that the substance is of moderate persistence in the environment. The substance is quickly eliminated from the water body, either by translocation into the sediment or by degradation. Considering the total system, the substance will be slowly but thoroughly degraded in aquatic environment. In irradiated solution the substance degraded with a half-life of 1.4 days under study conditions, equivalent to a calculated half-life of about 6 days under natural sunlight. Hydrolysis is not seen as an important mechanism for the breakdown of the substance which showed to be stable at pH values 5, 7 and 9. The substance is not readily biodegradable following the screening criteria according to OECD and mineralization in surface water is negligible (DT50 > 1000 days at 20 °C). If released into natural water the substance is quickly eliminated from the water body, by translocation into the sediment (DT50 water 2.7 – 4.8 days at 20 °C). The DT50 values for the substance in the entire water-sediment systems were determined to range between 126.7 days and > 365 days at 20 °C under aerobic conditions. Also in soil the parent substance degrades under aerobic conditions. The determined half life time in soil ranged from 22 to 177 days at 20-25 °C. No transformation products were formed under anaerobic conditions.
An adsorption/desorption study with the test substance following OECD 106 shows a mean KOC of 496.3, which indicates a tendency to adsorb to soil. The substance can be classified for low mobility. The soil photolysis is a minor degradation pathway; the equivalent mean DT50 data for moderate light intensity is 35.6 - 55.1 days.
Due to the low vapour pressure of the substance of 0.25 x 10-07 Pa at 20 °C, a Henry’s Law Constant < 0.01 Pa x m3x mol-1 and the rapid half-life in air calculated according to the Atkinson method to be 0.33 – 0.49 days, it is concluded that the substance will not accumulate in air and will not be transported through the vapour phase into other environmental compartments in relevant amounts. Thus, air is not a likely route of environmental contamination and no accumulation and subsequent deposition of the substance is to be expected.
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