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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. However, since there is only 0 percent diffusion of the substance in the sediment medium and hence persistence in the sediment compartment is not likely to be critical.

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