Registration Dossier

Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

As per biowin model N,N-dimethyl-p-toluidine is not readily biodegradable in water as the Biowin3 (ultimate survey model) result is p = 2.5707 months ( if in days or weeks then readily biodegradable), AND the Biowin5 (MITI linear model) probability is p= 0.3002 ( less than 0.5 is not readily biodegradable), while on the basis of fugacity model half life of N,N-dimethyl-p-toluidine in sediment is 337.5 days (8100 hrs.).Based on these half life values of it is concluded that N,N-dimethyl-p-toluidine is non biodegradable in sediment. However, since there is negligible diffusion of the substance in the sediment medium as evident from the reported data (0.175%) and hence persistence in the sediment compartment is not likely to be critical.

Key value for chemical safety assessment

Half-life in freshwater:
37.5 d
at the temperature of:
25 °C
Half-life in freshwater sediment:
337.5 d
at the temperature of:
25 °C

Additional information

As per biowin model N,N-dimethyl-p-toluidine is not readily biodegradable in water as the Biowin3 (ultimate survey model) result is p = 2.5707 months ( if in days or weeks then readily biodegradable), AND the Biowin5 (MITI linear model) probability is p= 0.3002 ( less than 0.5 is not readily biodegradable), while on the basis of fugacity model half life of N,N-dimethyl-p-toluidine in sediment is 337.5 days (8100 hrs.).Based on these half life values of it is concluded that N,N-dimethyl-p-toluidine is non biodegradable in sediment. However, since there is negligible diffusion of the substance in the sediment medium as evident from the reported data (0.175%) and hence persistence in the sediment compartment is not likely to be critical.