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Environmental fate & pathways

Biodegradation in soil

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Administrative data

Link to relevant study record(s)

Description of key information

Half lives ranged from 15.6 to 186 days, No guideline, Hosang (1997)
Biphasic degradation, 1st phase 5.3 days, 2nd phase 107.9 days, DT50 50 days, EPA 162-1, Clark (1999)
Half life 19.1 days, EPA 162-3, Clark 1999.
Biphasic degradation, 1st phase 5.4 days, 2nd phase 107.9 days, EPA 162-1, , DT50 30 days McDonald (1999)
Half lives ranged from 66.1 to 78.2 days 95/36/EEC Annex II:, , Morgenroth (1999)
Aerobic half life 55.2 days, anaerobic half life 59.5 days, 95/36/EC Annex II: 7.1.1, Nicollier (1999)
DT50 22.3 days, low moisture half life 122.7 days, 95/36/EC Annex II: 7.1 &, Nicollier (1999)
Aerobic DT50 50.4 days, anaerobic DT50 45.5 days, 95/36/EC Annex II: 7.1.1, Reischmann (1999)
Half lives ranged from 57.9to 83.3 days, 95/36/EC Annex II: 7.1 & 7.1.1, IBAMA (Port. 84/96), Brandelli (2000)
Half life 19.8 days EPA 162-3, , McDonald (2000)
Half life 20 to 52.3 days, Koc 129 to 17524 mL/g, EPA 163-1, Moore (2000)
Half life 24 to 133.0 days, Koc 101.5 to 1710.0 mL/g, EPA 163-1, Peters (2000)

Key value for chemical safety assessment

Additional information

This endpoint has been addressed on a weight of evidence basis. Twelve soil degradation studies have been provided covering tests on a range of effect parameters.

Half lives ranged from approximately 15.6 to 186 days, measured under varying parameters and the DT50 ranged from 22.3 to 50.4 days. The half life of the test material was considered to be independent to soil properties (Morgenroth, 1999), however dissipation was faster under acidic conditions (Hosang, 1997). Furthermore aerobic/anaerobic conditions had little effect on the rate of degradation (Nicollier, 1999 and Reischman, 1999). The moisture level of the soil was observed to have a significant effect on the half life of the test material in soil, lower moisture levels dramatically increased half lives (Nicollier, 1999 and Hosang, 1997). Degradation was shown to be biphasic with a short 1stphase followed by a significantly longer 2ndphase (Clark and McDonald 1999). Up to six consistent metabolites were identified. The consensus is that the primary route of degradation occurred via hydrolysis, where adsorption/desorption and microbial degradation only contributed to degradation slightly.

Hosang (1997) is a non-GLP compliant study performed to sound scientific principles with a sufficient level of detail to assess the quality of the submitted data. In line with the principles for assessing data quality set out by Klimisch (1997) this study has been assigned a reliability score of 2. The remaining eleven 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. The studies are all considered to be reliable, relevant and adequate for risk assessment purposes.