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Environmental fate & pathways

Adsorption / desorption

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Description of key information

The Soil Adsorption Coefficient i.e Koc value of 2,4-Diaminobenzenesulfonic acid was estimated using EPI suite  KOCWIN Program (v2.00) program as Koc 10 L/kg(log Koc=1)  by means of MCI method at 25 deg.C. This Koc value indicates that the substance 2,4-Diaminobenzenesulfonic acid has a Negligible sorption to soil and  sediment and therefore have rapid migration potential to groundwater.

Key value for chemical safety assessment

Koc at 20 °C:
10

Additional information

Experimental and Predicted data of adsorption endpoint for the target chemical 2,4-Diaminobenzenesulfonic acid (Cas no. 88-63-1) and its read across chemical were reviewed to summarize as follows:  

From predicted model EPI suite 2016 and chemspider predicted database indicate that the soil adsorption coefficient (Koc) value of chemical 2,4-Diaminobenzenesulfonic acid is estimated to be 10 L/kg (log KOC = 1) by means of MCI method at 25 deg.C, indicating that it is has a Negligible sorption to soil and sediment and therefore have rapid migration potential to groundwater.

For the read across substance, Sulfanilic acid (Cas no. 121-57-3), experimental study from HSDB authorative database also indicate that the adsorption coefficient (Koc) of substance Sulfanilic acid was found to be 10 using a structure estimation method based on molecular connectivity indices. This Koc value suggests that Sulfanilic acid is expected to have very high mobility in soil.

Both the results reported above are further supported by read across 2-aminobenzene-1, 4-disulphonic acid (Cas no. 98-44-2) for which information in Scifinder database indicates the Koc value of 2-aminobenzene-1, 4-disulphonic acid is estimated to be 10 at pH: 1-10 and Temp: 25 °C.

Thus based on the above all studies it is concluded that the test substance 2,4-Diaminobenzenesulfonic acid (Cas no. 88-63-1) has a negligible sorption to soil and sediment i.e have rapid migration to ground water.

[LogKoc: 1.0]