Registration Dossier
Registration Dossier
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EC number: 205-299-3 | CAS number: 137-51-9
Endpoint summary
Administrative data
Description of key information
Additional information
Stability
Phototransformation in air
The atmospheric oxidation half-life of 4-aminobenzene-1,3-disulphonic acid was estimated using the level III multimedia model. It was estimated that the substance is persistent in air medium as the half life period of 4-aminobenzene-1,3-disulphonic acid in air is only 3.1 days. This indicates that 4-aminobenzene-1,3-disulphonic acid is not rapidly phototransformed in air.
OVERALL OH Rate Constant =0.0000000000052cm3/molecule-sec at 25 degrees C
Hydrolysis
The Hydrolysis rate constant of 4-aminobenzene-1,3-disulphonic acid was estimated to be 0.0000000000052004 (5.2004 E-12) cm3/molecule-sec at a half life of 24.681 hrs. The estimated half life indicates that 4-aminobenzene-1,3-disulphonic acid would be slowly hydrolysable.
Biodegradation
Biodegradation in water : screening tests
The half life period of 4-aminobenzene-1,3-disulphonic 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 4-aminobenzene-1,3-disulphonic acid in water medium is 24%. This coupled with the dilution of water shall result in ready biodegradabililty of the chemical.
Media |
Half-Life (days) |
Percent in |
Water |
15 |
24 % |
Biodegradation in water and sediment: simulation tests
Based on the Level III Fugacity Model, the half life period of the 4-aminobenzene-1,3-disulphonic acid was estimated. The half period of 4-aminobenzene-1,3-disulphonic acid in water is 15 days (360 hrs) therfore 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.
Media |
Half-Life (days) |
Percent in |
Water |
15 |
24% |
Sediment |
140 |
0% |
Biodegradation in soil
The PBT Profiler & EPI Suite has estimated that 4-aminobenzene-1,3-disulphonic acid is expected to be found predominantly in soil and its persistence estimate is based on its availability in this medium. Its half-life in soil, 30 days (720 hrs). This does not exceeds the threshold of >= 2 months (and <= 6 months). Therefore, 4-aminobenzene-1,3-disulphonic acid is estimated to be biodegradable in the soil environment.
PBT estimate:
Media |
Half-Life (days) |
Percent in Each Medium |
Soil |
30 |
76 % |
EPI Suite:
|
Mass Amount (percent) |
Half-Life (hr) |
Emissions (kg/hr) |
Soil |
76.2 |
720 |
1000 |
|
Fugacity (atm) |
Reaction (kg/hr) |
Advection (percent) |
Reaction (percent) |
Advection (percent) |
Soil |
1.31e-022 |
1.54e+003 |
0 |
51.3 |
0 |
Bioaccumulation
Bioaccumulation: aquatic / sediment
The estimated bioconcentration factor (BCF) of 4-aminobenzene-1,3-disulphonic acid reported as 3.2, does not exceed the bioconcentration threshold of 1000. Thus it is concluded that 4-aminobenzene-1,3-disulphonic acid is not expected to bioaccumulate in the food chain because it does not exceed the BCF criteria.
Transport and distribution
Adsorption / desorption
The Adsorption Coefficient i.e Koc value of 4-aminobenzene-1,3-disulphonic acid was estimated as 33.79 L/kg (log koc as 1.528) at 25 deg C , by the MCI method. Thus suggesting that 4-aminobenzene-1,3-disulphonic acid shows low sorption to soil and sediment, and moderate migration potential to groundwater.This koc value is equivalent to 27.032 (log koc as 1.43) at 20 deg C.
Henry's Law constant
Henry's Law states that at a constant temperature, the amount of a given gas that dissolves in a given type and volume of liquid is directly proportional to the partial pressure of that gas in equilibrium with that liquid. Henrys Law Constant of 4-aminobenzene-1,3-disulphonic acid which is a liquid at 25 deg C was estimated as 4.21E-014 Pa-m3/mole
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