Registration Dossier
Registration Dossier
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EC number: 202-401-8 | CAS number: 95-23-8
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
The ready biodegradability of the test item 5 -Aminobenzimidazolon was determined in the Manometric Respirometry Test for a period of 28 days according to OECD guideline 301 F. The test item has to be regarded as not readily biodegradable.
Key value for chemical safety assessment
Additional information
The ready biodegradability of the test item 5 -Aminobenzimidazolon was determined in the Manometric Respirometry Test for a period of 28 days according to OECD guideline 301 F.
The 1sttest item replicate did not reach the 10 % level (beginning of biodegradation) within 28 days and came to maximum of 2 % biodegradation on day 27. The 2ndtest item replicate reached the 10 % level after 8 days and a maximum of 14 % after 16 days. The 60 % pass level was not reached until day 28. The mean biodegradation rate after 28 days was 7 %. Therefore the test item has to be regarded as not readily biodegradable.
A second test on inherent biodegradability according to OECD 301B was carried out in 1988. The degradation rate found was 13%. This study supports the result that the substance is not readily biodegradable but there is some evidence that biodegradation is possible.
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