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Diss Factsheets

Environmental fate & pathways

Biodegradation in water: screening tests

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Administrative data

Link to relevant study record(s)

Description of key information

Not readily biodegradable.

Key value for chemical safety assessment

Additional information

There are no experimental available data of the target substance, thus the information on the Similar Substance 01 have been taken into account. Details on the substance similarity are reported in the document attached to the IUCLID section 13.

The substance has been tested by screening studies (BOD5, COD) conducted according to the CIBA GEIGY AG internal method 15 and 16.

COD/BOD5 ratio

Biochemical Oxygen Demand (BOD5) and Chemical Oxygen Demand (COD) are the most commonly used parameters for the characterization of the biodegradability capacity.

COD results are typically higher than BOD5 values, and the ratio vary depending on the characteristics of the substrate. This ratio has been commonly used as an indicator for biodegradation capacity, the "Biodegradability index" (B.I.).

As indicated in ECHA Guidance requirement R.7B, the BOD5 test is a traditional biodegradation test that is now replaced by the ready biodegradability tests. Therefore, this test should not be performed today for assessment of the ready biodegradability of substances.

Older test data may, however, be used when no other degradability data are available.

For the assessment only short abstracts on BOD5 and COD are available.

COD was measured according to Method A-16. The COD measured was 1146.88 mg/g O2, at concentration of 5 mg/l.

BOD5 was measured according to Method A-15. The BOD5 measured was 320 mg/g O2, at concentration of 10 mg/l.

The ratio BOD5/COD is 0.28

When the ratio BOD5/COD > 0.5 the situation can be compared with short time period degradation. In this case the ratio is < 0.5, therefore it is possible to conclude that the substance is not readily biodegradable.