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Environmental fate & pathways

Biodegradation in soil

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Description of key information

DT50 = 10.5 to 71 days, 98 - 100% degradation after 180 to 365 days

Key value for chemical safety assessment

Additional information

Three reports are available for the degradation of the substance in the soil compartment. In an extensive study following GLP and EU Council Directive 91/414/EEC as amended by Commission Directive 95/36/EC, the fate of the substance was investigated over a period of 180 days. The degradation rate of the substance was determinedin four soil typesat 20 °C(clay loam, sandy loam, loam and sand)and in one soil type at 10 °C (loam). The half-life of the substance ranged from 10.5 days (clay loam) to 50.8 days (sand) at 20 °C and was 17.8 days in loam at 10 °C. The substance attained 89 – 100% degradation at test termination.

Another study according to GLP and US EPA Guidelines, investigated the degradation of the substance in two sandy loam and silt loam at 25 °C over a period of 365 days. The half-life was 30 days in sandy loam and and 71 days in silt loam respectively. The numbers for degradation were > 50% after 30 days and 98% after 180 days in sandy loam and > 50% after 60 days and 98% after 365 days in silt loam.

The results of a third study following GLP and EU Council Directive 91/414/EEC as amended by Commission Directive 95/36/EC are in the same range. The half-life of the substance was 41 days at 20 °C and it reached 85% degradation within 266 days in loam.