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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

Entire system half life 22.8 to 25.6 days, water half life 5.2 to 10.6 days, 95/36/EC Annex II: 7.2.1.3.2, OECD 208 (Draft version), Pflanzenschitzmitteln Part IV, 5-1, Adam 1999.
Entire system half life 14.7 days, sediment half life 20.0 days, water half life 10.7 days, EPA 162-4, Clark 2000.
Entire system half life 21.5 days, sediment half life 27.1 days, water half life 15.9 days, EPA 162-4, Clark 2001.

Key value for chemical safety assessment

Additional information

The biodegradability of the test material in water and sediment was determined in three studies provided as a weight of evidence, Adam (1999), Clark (2000) and Clark (2001). Studies determined the half live of the test material in the different components, identified metabolites and proposed degradation pathways.

Adam (1999) determined the half life of the test material in pond and river aquatic systems at 20 ºC, Clark (2000) determined the half life in sandy loam sediment at 25 ºC and Clark (2001) determined the half life in silt loam sediment at 25ºC. Half lives ranged from 5.2 to 15.9 days for the aqueous component, 20.0 to 27.1 days for the sediment, and between 14.7 and 25.6 days for the entire system. Similar metabolic patterns were seen in all three studies, five different metabolites were identified. The routes of degradation were considered to be hydrolysis and microbial degradation.

The presented studies were all performed according to GLP and standardised guidelines, with a high level of reporting and have thus been assigned a reliability score of 1 in line with the principles for assessing data quality set out by Klimisch (1997). The study is considered to be reliable, relevant and adequate for risk assessment purposes.

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