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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

DT50 = 12 - 13.5 days, 96 - 97% degradation in water and sediment (EU Council Directive 91/414 EEC)

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One simulation test was carried out to assess the degradation of the substance in two aquatic sediment systems and to determine the metabolites formed under aerobic aquatic conditions (Oddy, 1999). The study followed GLP and EU Council Directive 91/414 EEC as amended by Commission Directive 95/36/EC. The duration of the test with two different water/sediment-samples was 100 days. Under aerobic aquatic conditions, the substance was found to be degraded by 96 and 97% in water and sediment, respectively. It was rapidly transferred from the water to the sediment where it was reduced via the sulphoxide group to one major metabolite and a minor metabolite. The half-life of the substance in water was determined to be 12 - 13.5 days.