Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Biodegradation in water

The half life period of 2-aminobenzenesulphonic acid in water is 15 days and based on this value it can be concluded that the chemical is not persistent in water medium since the half life is less than the threshold of 60 days (to qualify the chemical as persistent). Also the diffusion percentage of 2-aminobenzenesulphonic acid in water medium is 31%. This coupled with the dilution of water shall result in ready biodegradabililty of the chemical.

Media

Half-Life (days)

Percent in
Medium

Water

15

 31%

Biodegradation in water and sediment

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.

Media

Half-Life (days)

Percent in
Each Medium

Water

15

  31%

Sediment

140

  0%

Biodegradation in soil

From experimental study biodegradation of test substance 2-aminobenzenesulphonic acid in soil done by soil microflora in >64 days. Therefore, Benzimidazole-2-thiol is estimated to be not persistent in the soil environment that not exceed the criteria for persistent i.e 120 days as per Annex XIII of REACH.