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Adsorption/desorption:

The Soil Adsorption Coefficient i.e Koc value of test substance 4-hydroxy-6-[(3-sulfophenyl)amino]naphthalene-2-sulfonic acid (CAS no. 25251-42-7) was estimated using Adsorption Coefficient module (v12.1.0.50374) program as Koc 1.0 dimensionless (log Koc= 0.0). This log Koc value indicates that the test substance 4-hydroxy-6-[(3-sulfophenyl)amino]naphthalene-2-sulfonic acid has a negligible sorption to soil and therefore have rapid migration potential to groundwater.

Additional information

Adsorption/desorption:

Various predicted data for the target compound 4-hydroxy-6-[(3-sulfophenyl)amino]naphthalene-2-sulfonic acid (CAS no. 25251-42-7) were reviewed for the Adsorption end point which are summarized as below.

The Soil Adsorption Coefficient i.e Koc value of test substance 4-hydroxy-6-[(3-sulfophenyl)amino]naphthalene-2-sulfonic acid( CAS no. 25251-42-7) was estimated using Adsorption Coefficient module (v12.1.0.50374) program of ACD (Advanced Chemistry Development)/I-Lab predictive module, 2017 as Koc 1.0 dimensionless (log Koc= 0.0).

In a prediction done by using Sci Finder database of ACS (American Chemical Society, 2017) to estimate soil adsorption co-efficient i.e., Koc value of test chemical 4-hydroxy-6-[(3-sulfophenyl)amino]naphthalene-2-sulfonic acid (CAS no.25251-42-7) was estimated to be 1.0 dimensionless ( log Koc = 0.0) at pH 1-10 at temperature 25 deg.C.

Another prediction done by using Chemspider-ACD/Phy chem suite of Royal Society of Chemistry, 2017 the soil adsorption co-efficient i.e., Koc value of test substance4-hydroxy-6-[(3-sulfophenyl)amino]naphthalene-2-sulfonic acid (CAS no 25251-42-7) was estimated to be 1.0 dimensionless (log Koc= 0.0) at pH 5.5 and 7.4 and temperature 25 deg. C.

Last prediction done from CompTox Chemistry Dashboard using OPERA (OPEn (quantitative) structure-activity Relationship Application) V1.02 model in which calculation based on PaDEL descriptors (calculate molecular descriptors and fingerprints of chemical) the adsorption coefficient i.e KOC for test substance 4-hydroxy-6-[(3-sulfophenyl)amino]naphthalene-2-sulfonic acid (CAS no.25251-42-7) was estimated to be 96.6 L/kg (log Koc = 1.98) it is based on the 5 OECD principles.

On the basis of above results for target chemical substance 4-hydroxy-6-[(3-sulfophenyl)amino]naphthalene-2-sulfonic acid (CAS no. 25251-42-7) (from ACD labs, Sci Finder database, Chemspider and Comptox Chemistry dashboard 2017) it can be concluded that the Koc value of test substance 4-hydroxy-6-[(3-sulfophenyl)amino]naphthalene-2-sulfonic acid ranges from 1 to 96.6 dimensionless (log Koc range =0.0 – 1.9) Thus by considering log Koc value range it is concluded that the test substance 4-hydroxy-6-[(3-sulfophenyl)amino]naphthalene-2-sulfonic acid has a negligible to low sorption to soil and sediment and therefore have rapid to moderate migration potential to ground water.