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Environmental fate & pathways

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The test substance is not readily biodegradable according to OECD 301 C.

4,4'-sulfonyldiphenol showed no biodegradation under aerobic conditions in tests conducted using river and seawater. Under anaerobic condition however the removal of 4,4'-sulfonyldiphenol in sediment reached about 60% after 60 days.

Although 4,4'-sulphonydiphenol is assessed as not readily biodegradable, there is evidence that the substance may be degraded by microbial populations after acclimatisation (BASF, 2006; BASF 2018). The role of adaptation in the biodegradation process is confirmed by studies demonstrating high removal of 4,4'-sulphonydiphenol from wastewater treatment plants (Qian Sun et al., Environmental Pollution 225: 542 -549, 2017; M. Cesen et al., Science of the Total Environment, 616 -617: 744 -752, 2018).

4,4'-sulphonyldiphenol was rapidly biodegraded in soils with observed half-lives of < 1 day.