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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

Aerobic and anaerobic investigations performed with the degradation product CYA.    

Key value for chemical safety assessment

Additional information

CYA was shown to preferentially biodegrade in solid phase as opposed to liquid phase when tested with creek water and mud.

Cyanuric acid biodegrades readily under a wide variety of natural conditions, and particularly well in systems of either low or zero dissolved oxygen level, such as anaerobic activated sludge and sewage soils, muds and muddy streams and river waters as well as ordinary activated sludge systems with typically low (1 – 3 ppm) dissolved oxygen levels.

In highly aerobic media cyanuric acid resists biodegradation. The ability to degrade cyanuric acid is rapidly gained and lost by bacteria in aerated medium when dissolved oxygen was lowered and raised.