Registration Dossier
Registration Dossier
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EC number: 204-200-0 | CAS number: 117-61-3
Biodegradation in water and sediment: simulation tests
Administrative data
Link to relevant study record(s)
Description of key information
Based on the Level III Fugacity Model , the half life period of the Benzidine-2,2’-disulphonic acid was estimated.
Half life period of Benzidine-2,2’-disulphonic acid in water was observed to be 38 days while in sediment it is 340 days. Based on these half life values of it is concluded that Benzidine-2,2’-disulphonic acid is readily biodegradable in water where as it is non biodegradable in sediment. 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.
Key value for chemical safety assessment
- Half-life in freshwater:
- 38 d
- Half-life in freshwater sediment:
- 340 d
Additional information
Based on the Level III Fugacity Model , the half life period of the Benzidine-2,2’-disulphonic acid was estimated.
Half life period of Benzidine-2,2’-disulphonic acid in water was observed to be 38 days while in sediment it is 340 days. Based on these half life values of it is concluded that Benzidine-2,2’-disulphonic acid is readily biodegradable in water where as it is non biodegradable in sediment. 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.
The Supporting study also indicates that half life period of Benzidine-2,2’-disulphonic acid in water and sediment as 900 hrs (37.5 days) and 8100 hrs (337.5days) respectively.
Medium |
Half life in Days |
Percent in medium |
Water |
38 |
12% |
Sediment |
340 |
0% |
Media |
Half life (hrs) |
Percent in medium |
Emission (kg/hr)
|
Water |
900 |
12.3%
|
1000 |
Sediment |
8100 |
0.398%
|
0 |
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