4,4'-dinitrostilbene-2,2'-disulphonic acid

Endpoint summary

Additional information

Stability :

Phototransformation in air :

The atmospheric oxidation half-life of 4,4'-dinitrostilbene-2,2'-disulphonic acid was estimated using the level III multimedia model. It was estimated that the substance is not persistent in air medium as the half life period of 4,4'-dinitrostilbene-2,2'-disulphonic acid in air is only 0.071 days. This indicates that 4,4'-dinitrostilbene-2,2'-disulphonic acid is easily phototransformed in air.

Media	Half life (days)	Percent in Medium
Air	0.071	0%

Hydrolysis :

The Hydrolysis rate constant of 4,4'-dinitrostilbene-2,2'-disulphonic acid is estimated to be 0.00000000000000025199999 (25.199999 E-17) cm3/molecule-sec. at half life of the 1.091 Hrs.The estimated half life of the substance indicates that the substance is rapidly hydrolysable.

sable.

Biodegradation

Biodegradation in Water : Screening test : 

The half life period of 4,4'-dinitrostilbene-2,2'-disulphonic acid in water is 60 days and based on this value it can be concluded that the chemical is persistent in water medium and will not easily bio-degrade. Also the diffusion percentage of 4,4'-dinitrostilbene-2,2'-disulphonic acid in water medium was observed to be 7%.

Media	Half life (days)	Percent in Medium
Water	60	7%

 

Biodegradation in water and sediment :

Half life period of 4,4'-dinitrostilbene-2,2'-disulphonic acid in water observed 60days (half-life) while in sediment it is 540 days.(half-life).

The supporting study also indicates the half life of 4,4'-dinitrostilbene-2,2'-disulphonic acid in water and sediment to be 1440 hrs and 13000 hrs respectively.

Based on this half life values of 4,4'-dinitrostilbene-2,2'-disulphonic acid, it is concluded that the chemical is non biodegradable in water and sediment medium.

Media	Half life (days)	Percent in Medium
Water	60	7%
sediment	540	11%

Media	Half life (hrs)	Percent in medium	Emission (kg/hr)
Soil	1440	7.22%	1000
Sediment	13000	10.9%	0

Biodegradation in soil :

 The PBT Profiler & EPI Suite has estimated that 4,4'-dinitrostilbene-2,2'-disulphonic acid is expected to be found predominantly in soil and its persistence estimate is based on its transformation in this medium. Its half-life in soil, 120 days., exceeds the threshold (60 days) of being persistent in soil.Therefore, 4,4'-dinitrostilbene-2,2'-disulphonic acid is estimated to be persistent in the soil environment. The substance 4,4'-dinitrostilbene-2,2'-disulphonic acid diffuse to the extent of 82% in the soil medium.

PBT Profiler

Media	Half life (days)	Percent in Medium
Soil	120	82%

Fugacity Model by EPI Suite estimation database

	Mass Amount (percent)	Half-Life (hr)	Emissions (kg/hr)
Soil	81.9	2.88e+003	1000

Bioaccumulation :

Bioaccumulation in Water and Sediment :

Bioaccumulation is the process by which the chemical concentration in an aquatic organism achieves a level that exceeds that in the water, as a result of chemical uptake through all possible routes of exposure. The relationship between bioaccumulation and bio-concentration is that, chemicals that have the potential to bioconcentrate also have the potential to bioaccumulate. Bioaccumulation is closely related to the Bioconcentration factor (BCF).

The estimated BCF of 4,4'-dinitrostilbene-2,2'-disulphonic acid in the key study was obtained to be 3.2. Supporting study also indicate the BCF to be 3.162. This low value of BCF of 4,4'-dinitrostilbene-2,2'-disulphonic acid indicates its non bioaccumulative nature as the BCF factor is less than the bio-concentration threshold of 1000.

Transport and distribution

Adsorption / desorption :

Soil Adsorption Coefficient i.e Koc value of 4,4'-dinitrostilbene-2,2'-disulphonic acid was estimated as 19770 L/kg (LogKoc= 4.2960) by means of MCI method. This indicates that 4,4'-dinitrostilbene-2,2'-disulphonic acid will strongly adsorb to the organic carbon fraction of the soil and will not have the tendency to move with the water content in the soil medium.The Koc value of the key study at 20 degC is equivalent to a value of 15816 (LogKoc= 4.1990).

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 4,4'-dinitrostilbene-2,2'-disulphonic acid at 25 deg C is 4.26E-017 (0.0000000000000000426) Pa m³/mol.