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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

The half-life period of 5-nitro-o-anisidine in water is estimated to be 912 h (38 days) while in sediment it is 8160 h (340 days).

Key value for chemical safety assessment

Half-life in freshwater:
912 h
at the temperature of:
25 °C
Half-life in freshwater sediment:
8 160 h
at the temperature of:
25 °C

Additional information

Based on the Level III Fugacity Model, the half-life period of 5 -nitro-o-anisidine in water is estimated to be 38 days, while in sediment it is 340 days. Based on this value, it is concluded that 5 -nitro-o-anisidine is biodegradable in water only. Also from the above halflifes it can be concluded that 5 -nitro-o-anisidine is not persistent in water and persistent in sediment medium. However, since there is no diffusion of the substance in the sediment as evident from the reported data (0% in sediment) and hence persistence in the sediment compartment is not likely to be critical.