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Environmental fate & pathways

Biodegradation in water: screening tests

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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.

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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.