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Environmental fate & pathways

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
Medium

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
Medium

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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