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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

The experimental study concluded that the half-life of DCDPS in a water/sediment system would exceed 100 days. 

Key value for chemical safety assessment

Half-life in freshwater:
6.2 d
at the temperature of:
20 °C
Half-life in freshwater sediment:
394.3 d
at the temperature of:
20 °C

Additional information

In the study entitled “ [14C] 4,4’-Dichlorodiphenyl Sulphone: Aerobic Trans formation in Aquatic Sediment Systems” (Talken, 2014), the biotransformation of the test substance was studied in two different flooded sediment systems under aerobic conditions. The study showed that the test substance increasingly migrates from the water column to the sediment layer over time and that aerobic transformation is not a major pathway of degradation. Although the values for half-life in water between the two test systems were similar (6.2 d in Goose River, 7.1 d in Tift), the values for half-life in sediment were more divergent (394.3 d in Goose River, 1287.2 d in Tift). The 100-d study concluded that no degradation of the substance (4,4’-DCDPS) was observed in either of the two water/sediment test systems over the course of this study, indicating that the substance would show persistence in aerobic aquatic systems in the environment.