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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 (according to OECD criteria) but inherently biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
inherently biodegradable

Additional information

In an enhanced OECD 301B ready biodegradability study, using non-adapted activated sludge from a municipal sewage treatment plant as inoculum, the substance was found to be 87% degraded after 60 days based on CO2 evolved (BASF SE 2012, report no. 22G0487/11G091). However, the substance was only 56% degraded by day 32 and the 10-day window was not met. Hence, the substance cannot be considered readily biodegradable, but these results strongly indicate that the substance is inherently biodegradable.

The data of an inherent biodegradability test conducted equivalently to an OECD 302 B study support this indication; the substance was 97% degraded after 13 days based on DOC (BASF SE 1986, report no. 01.449/86) As inoculum, industrial activated sludge was used.

Further, the degradation rate (BOD5*100/COD) was found to be <1% (BASF SE 1986, report no. 01./449) in a BOD 5 test according to German Industrial Standard DIN 38409, part 51.

In conclusion, the substance is considered to be inherently biodegradable, but not readily biodegradable (according to OECD criteria).