Registration Dossier
Registration Dossier
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EC number: 281-013-0 | CAS number: 83833-37-8
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
BOD5/COD = 0 (first study)
BOD5/COD = 0.18 (second study)
Key value for chemical safety assessment
Additional information
Different available tests may be valuable, as part of the assessment approach that gives information on biodegradability.
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 between 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.
Studies on BOD5 and COD are available for this substance, therefore they have been used in the weight of evidence approach for this substance.
The two tests have been conducted according to the internal methods A-15 and A-16. Only short abstract are available.
The BOD5/COD ratio is 0 in the first study and 0.18 in the second study.
Based on the BOD5/COD ratio ( 0 and 0.18 ) the substance is considered as non readily biodegradable.
These results are in line with the one obtained in other test listed in the table attached in the information panel below.
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