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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

There are 2 studies for this endpoint which are robust and can be considered as key or supporting studies

(both being used in read-across to the Registration material from similar materials).

Both of these studies demonstrate lack of ready biodegradability, and it can be assumed that the Registration material would similarly not be readily biodegradable under these conditions.
Edwards et al, 1996 (WESTON report number: 96-043) conducted a CO2 evolution test on a test substance.

This test was designed to determine the rate and extent of the ultimate biodegradation of the test substance under aerobic conditions.
4.7 - 10.4% degradation was seen in 28 days. Based on these results the test substance would not be considered readily biodegradable under the European Economic Community (EC) criteria, which requires 60% biodegradation within 28 days, achieved within 10 days of reaching 10% biodegradation.
In a study on the ready biodegradability of the test substance in a CO2 Evolution Test by Schafefer et al, 1998 (WILDLIFE INTERNATIONAL LTD. PROJECT NO.: 331E-114) the test substance can be described as not readily biodegradable under the conditions of the test and only 13.4% degradation was seen in 28 days.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

Edwards et al, 1996 (WESTON report number: 96-043) conducted a CO2 evolution test on a test substance. This test was designed to determine the rate and extent of the ultimate biodegradation of the test substance under aerobic conditions. 4.7 - 10.4% degradation was seen in 28 days. Based on these results the test substance would not be considered readily biodegradable under the European Economic Community (EC) criteria, which requires 60% biodegradation within 28 days, achieved within 10 days of reaching 10% biodegradation. In another study on the ready biodegradability of the test substance in a CO2 Evolution Test by Schafefer et al, 1998 (WILDLIFE INTERNATIONAL LTD. PROJECT NO.: 331E-114) the test substance can be described as not readily biodegradable under the conditions of the test and only 13.4% degradation was seen in 28 days.These studies for Biodegradation are considered to have a reliability rating of 1, however these are being used as read across from a structurally similar substance (Phenol, tetrapropenyl-, sulfurized, calcium salts CAS No. 68855-45-8) as there were no available data to fulfil this endpoint for the test material and so the reliability rating will be reduced to 2, according to the criteria of Klimisch, 1997.

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