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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Readily biodegradable according to OECD criteria: >= 78% degradation after 28 d (OECD 301F)

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

One experimental study is available investigating the ready biodegradability of the substance (Hammesfahr, 2016). The study was performed according to the OECD guideline 301 F and GLP. A non-adapted, activated sludge from a domestic sewage treatment plant was used as inoculum and was exposed to an initial test substance concentration of 101.8 mg/L. As the substance contains nitrogen, the evaluation of biodegradation was converted to ThODNH4 and ThODNO3 values. After 28 days test duration, 89% and 78% degradation of the test substance (according to O2 consumption) was observed based on ThODNH4 and ThODNO3, respectively. The 10-day window criterion was fulfilled. A toxicity control containing both, reference substance (sodium benzoate) and test substance did not indicate inhibitory effects to the inoculum (ThODNH4: 67% and ThODNO3: 62% degradation after 14 d).