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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The substance is not readily biodegradable, based on the results of the BOD5 test.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

The ready biodegradability study using HEDP acid was selected as the key study (Handley & Mead, 1992). This study followed the 5 day Biological Oxygen Demand (BOD5) method (similar to OECD 301). The study is considered to be a reliable study to demonstrate that the substance is not readily biodegradable.

A very large number of supporting studies are available for the acid form and for the sodium salt of HEDP associated with WWTP simulation, aerobic and anaerobic studies using radiolabelling etc. All of the available evidence supports a lack of biodegradability even where pre-adapted inoculum is used, though in some cases removal from the system by adsorption processes has occurred.