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Environmental fate & pathways

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Results for the Test Item Tar wood:The test item Tar wood is considered as “not biodegradable“. The degree of biodegradation reached 47 % after 28 days. The 10-day-window began on day 4, at its end, 37 % were reached, missing the pass level of 60 % given in the OECD guideline. Abiotic degradation was not observed.

Additional information

The test item Tar wood was tested using a concentration of nominally 20 mg organic carbon/L (corresponding to 33.4 mg Tar wood/L) in test medium following OECD 301B and EU-Method C.4-C. Aniline was chosen as positive control.

Activated sludge was used as inoculum (concentration in the test 25.0 mg dry matter/L). The test was left running for 28 days.

All validity criteria were met. Degradation of the positive control was 65 % after eleven days.

The following data were determined for the test item Tar wood:

10-day-window: day 4 – 14

degradation at the end of 10-day-window 37 %

degradation at the end of the test 47 %

pass level following guideline: 60% at the end of 10-day-window

Therefore, regardless of the 10-day-window, Tar wood is not biodegradable following OECD 301B/EU C.4-C.