Disodium oxybis[methylbenzenesulphonate]

Bioaccumulation: aquatic / sediment

Description of key information

The bioconcentration factor (BCF) of ditolylether disulfonic acid disodium salt, isomer mixture was predicted using the Estimation Program Interface (EPI) Suite version 4.1. 
Ditolylether disulfonic acid disodium salt, isomer mixture is an UVCB substance consisting of positional isomers of two basic structures [sodium salts of disulfonated and trisulfonated ditolylether]. 
Since variations in the positions of the substituents have influence on calculations by the program, the calculations are performed using four representative constituents of ditolylether disulfonic acid disodium salt, isomer mixture. 
A potential of ditolylether disulfonic acid disodium salt, isomer mixture to accumulate in aquatic organisms is not given with a calculated BCF of 3.162 L/kg for each representative constituents. 
The predicted value can be considered reliable yielding a useful result for further assessment.

Key value for chemical safety assessment

BCF (aquatic species):

3.2 L/kg ww

Additional information

There is no measured data available on aquatic bioaccumulation.

The bioconcentration factor (BCF) of ditolylether disulfonic acid disodium salt, isomer mixture was predicted using the Estimation Program Interface (EPI) Suite version 4.1.

Ditolylether disulfonic acid disodium salt, isomer mixture is an UVCB substance consisting of positional isomers of two basic structures [sodium salts of disulfonated and trisulfonated ditolylether].

Since variations in the positions of the substituents have influence on calculations by the program, the calculations are performed using representative constituents of ditolylether disulfonic acid disodium salt, isomer mixture (two of each basic structure).

 

The representative constituents are:

A) disodium 3-methyl-4-(3-methyl-4-sulfonato-phenoxy)-benzenesulfonate

B) disodium 2-methyl-4-(3-methyl-4-sulfonato-phenoxy)-benzenesulfonate

C) trisodium 2-methyl-4-(2-methyl-4-sulfonato-phenoxy)-benzene-1,3-disulfonate

D) trisodium 2-methyl-5-(3-methyl-4-sulfonato-phenoxy)-benzene-1,3-disulfonate

 

Estimation of salts is not considered by the program. Therefore, the estimation is performed for the corresponding acid of each representative constituent and the log Kow for the non-dissociated form of the corresponding acid is taken into account for calculation as a worst-case assumption. By the program, the acids are classified as ionic substances.

As the log Kow for each representative constituent is below 5.0, a general log BCF of 0.50 is assigned by the program, resulting in a BCF of 3.162 L/kg wwt, indicating that the substance ditolylether disulfonic acid disodium salt, isomer mixture has no potential to bioaccumulate.

The representative constituents of ditolylether disulfonic acid disodium salt, isomer mixture fall within the applicability domain of the model and, therefore, the predicted value can be considered reliable yielding a useful result for further assessment.