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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Two studies on biodegradability of the test substance are available.

The ready biodegradability of the test item was assessed over a 28
day period by the OECD Screening Test (OECD 301E). The test material
attained up to 44 % biodegradation after 28 days whereas the
positive control substance (Aniline) was 88 % degraded after 7 days.
These results indicate that the test item cannot be classified as
readily biodegradable under conditions of the test.
In the modified Zahn-Wellens test according to OECD 302 B the test
substance was tested for inherent biodegradation. After 28 days the
test substance was degraded to 61 % after 28 days, the reference was
degraded to 100 % in 27 hours. It was concluded that the test
substance is inherently biodegradable.
In addition, the chemical oxygen demand was determined to be 1.22 g
COD/g test substance in a 2 hour study. The chemical oxygen demand
of the reference substance potassium hydrogen phthalate was
determined to be 199.3 mg COD/L.

Key value for chemical safety assessment

Biodegradation in water:
inherently biodegradable

Additional information