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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

Weight of evidence:
Half-life, 4.5 to 6.4 days under aerobic conditions, Commission Directive 95/36/EC Annex II, Reischmann 1999.
Half-life, 4.9 days aerobic conditions, 3.1 days anaerobic conditions, Canadian pesticide guideline C:2, Reischmann 1999
Half-life, 1.5 – 2.4 days aerobic, 1.5 days anaerobic, Commission Directive 95/36/EC Annex II & Canadian pesticide guideline C:2, Reischmann 1999.
Half-life, 3.7 – 5.2 days aerobic, 4.0 to 13.0 days anaerobic, Commission Directive 95/36/EC Annex II & Canadian pesticide guideline C:2, Schulaze-Aurich 1999.

Key value for chemical safety assessment

Additional information

A weight of evidence has been provided to address biodegradation of the test material in water and sediment.

The consensus of the four studies was that the test material is rapidly degraded in various aquatic systems at 20 °C under both aerobic and anaerobic conditions. The test material was determined to have a half-life in the entire system of between 3.1 and 7.7 days; between 2.1 to 4.0 days in the aqueous phase and 1.5 to 2.4 days in sediment. At lower temperatures the half-life increased. Sterile aerobic incubations yielded much higher half-lives, 53.3 to 65 days for the entire system, where degradation occurred via hydrolysis. Metabolic patterns were comparable regardless of the type of aquatic system or the dose rate. Several metabolites were identified in four of the studies, with half-lives ranging from 2.2 days up to 458.1 days. End products were identified as carbon dioxide and bound residue.

All four studies was performed to a high standard, in line with GLP and in accordance with standardised guidelines and has thus been assigned a reliability score of 1 in line with the principles for assessing data quality set out in Klimisch (1997).

The available data are considered to be complete and the conclusion that the test material is rapidly degradable in aquatic systems at 20 °C has been taken forward for risk assessment.

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