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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

Half life period of 2-aminobenzenesulphonic acid in water observed 15days.(half-life) while in sediment it is 140 days.(half-life). Based on this half life values of 2-aminobenzenesulphonic acid, it is concluded that the chemical is readily biodegradable in water where as it is non biodegradable in sediment. However, the diffusion percentage in the sediment is 0%, indicating that 2-aminobenzenesulphonic acid is highly unlikely to gain entry in the

sediment environment.

Key value for chemical safety assessment

Half-life in freshwater:
15 d
at the temperature of:
25 °C
Half-life in freshwater sediment:
140 d
at the temperature of:
25 °C

Additional information

Based on the Level III Fugacity Model, the half life period of the 2-aminobenzenesulphonic acid was estimated. The half period of 2-aminobenzenesulphonic acid in water is 15 days (360 hrs) therefore it is considered that the substance will qualify as not persistent as the half life does not exceed the EPA criteria of 60 days. So, it can be confirmed that the substance is readily biodegradable in water medium where as in sediment the half life is 140 days (3360 hrs).

Based on this value, it can be inferred that the substance is persistent in sediment medium and is not readily biodegradable probably due to the anaerobic conditions existing in most sediments. However, it can be observed that 2-aminobenzenesulphonic acid does not diffuse in the sediment medium since it's percentage in the sediment medium is reported to be 0% and hence persistence in the sediment compartment is not likely to be critical.

PBT profiler estimation:


Half-Life (days)

Percent in
Each Medium