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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Adsorption/Desorption:

The Soil Adsorption Coefficient i.e Koc value of test substance 3-amino-5-hydroxynaphthalene-2,7-disulfonic acid ( CAS no. 90 -40 -4) was estimated using Adsorption Coefficient module (v12.1.0.50374) program as Koc 1 dimensionless (log Koc= 0). This log Koc value indicates that the test substance 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 3-amino-5-hydroxynaphthalene-2,7-disulfonic acid ( CAS no. 90-40-4) and a supporting weight of evidence study of its read across chemical were reviewed for the adsorption end point which are summarized as below:

The Soil Adsorption Coefficient i.e Koc value of test substance 3-amino-5-hydroxynaphthalene-2,7-disulfonic acid ( CAS no. 90 -40 -4) was estimated using Adsorption Coefficient module (v12.1.0.50374) of ACD (Advanced Chemistry Development)/I-Lab predictive module, 2017) module program as Koc 1 dimensionless (log Koc= 0). This log Koc value indicates that the test substance has a negligible sorption to soil and therefore have rapid migration potential to groundwater.

 

Next prediction done by using Sci Finder database of ACS ( American Chemical Society, 2017) the soil adsorption co-efficient i.e., Koc value of test chemical 3-amino-5-hydroxynaphthalene-2,7-disulfonic acid (CAS no. 90-40-4) was estimated to be 1 ( log Koc =0) at pH 1-10 at temperature 25 deg.C. This Koc value at all range of pH condition indicates that the substance 3-amino-5-hydroxynaphthalene-2,7-disulfonic acid has negligible sorption to soil and sediment therefore have rapid migration to ground water.

 

Another prediction done by using Chemspider-ACD/Phy chem suite the soil adsorption co-efficient i.e., Koc value of test substance 3-amino-5-hydroxynaphthalene-2,7-disulfonic acid (CAS no.90-40-4) was estimated to be 1 ( log Koc=0) at pH 5.5 and 7.4 and temperature 25 deg.C This Koc value at different pH indicates that the chemical 3-amino-5-hydroxynaphthalene-2,7-disulfonic acid has negligible sorption to soil and sediment and therefore rapid migration to ground water.

 

One more predicted value obtained 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 3-amino-5-hydroxynaphthalene-2,7-disulfonic acid (CAS no. 90-40-4) was estimated to be 115 L/kg (log Koc = 2.06) .The predicted KOC result based on the 5 OECD principles. Thus based on the result it is concluded that the test substance 3-amino-5-hydroxynaphthalene-2,7-disulfonic acid has a low sorption to soil and sediment and therefore have moderate migration potential to ground water.

 

In a supporting weight of evidence study from authoritative database ( HSDB, 2017) The Koc value for read across chemical disodium 7-hydroxy-8-[(E)-2-phenyldiazen-1-yl]naphthalene-1,3-disulfonate (CAS no.1936-15-8) is estimated by using using estimated log Kow -4.56 and regression derived eqation. The estimated Koc value is 0 dimensionless and log Koc is infinity this log  Koc value suggests that disodium 7-hydroxy-8-[(E)-2-phenyldiazen-1-yl]naphthalene-1,3-disulfonate is expected  to have negligible sorption to soil and sediment and therefore have rapid migration potential to ground water.

 

On the basis of above overall results for target chemical 3-amino-5-hydroxynaphthalene-2,7-disulfonic acid (from ACD labs, SciFinder, ChemSpider database and CompTox Chemistry Dashboard,2017), it can be concluded that the Koc value of test substance 3-amino-5-hydroxynaphthalene-2,7-disulfonic acid ranges from 1 to115 dimensionless ( log Koc range= 0 to 2.06) indicating that the test chemical 3-amino-5-hydroxynaphthalene-2,7-disulfonic acid has a negligible to low sorption to soil and sediment and therefore have a rapid to moderate migration potential to groundwater.

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