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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Adsorption/desorption:

KOCWIN model (v2.00) of Estimation Programs Interface (EPI Suite, 2018) was used to predict the soil adsorption coefficient i.e Koc value of test chemical 2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-[2-[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-8-[2-[2-sulfo-4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-, sodium salt (1:4) (CAS No. 607724 -37 -8). The soil adsorption coefficient i.e Koc value of test chemical 2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-[2-[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-8-[2-[2-sulfo-4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-, sodium salt (1:4) was estimated to be 42200 L/kg (log Koc=4.623)  by means of MCI method (at 25 deg C). This Koc value indicates that the substance 2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-[2-[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-8-[2-[2-sulfo-4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-, sodium salt (1:4) has a very strong sorption to soil and sediment and therefore have negligible migration potential to ground water.

Additional information

Adsorption/desorption:

Predicted data study for target chemical 2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-[2-[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-8-[2-[2-sulfo-4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-, sodium salt (1:4) (CAS no. 607724-37-8) and experimental study for its structurally similar read across chemical have been reviewed for adsorption endpoint and their results are summarized below.

 

The first study was predicted data study in this the KOCWIN model (v2.00) of Estimation Programs Interface (EPI Suite, 2018) was used to predict the soil adsorption coefficient i.e Koc value of test chemical 2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-[2-[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-8-[2-[2-sulfo-4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-, sodium salt (1:4) (CAS No. 607724 -37 -8). The soil adsorption coefficient i.e Koc value of test chemical 2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-[2-[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-8-[2-[2-sulfo-4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-, sodium salt (1:4) was estimated to be 42200 L/kg (log Koc=4.623)  by means of MCI method (at 25 deg C). This Koc value indicates that the test substance has a very strong sorption to soil and sediment and therefore has negligible migration potential to ground water.

 

 

Next study was experimental study reviewed from study report in this study the adsorption coefficient Koc in soil and in sewage sludge was determined by the Reverse Phase High Performance Liquid Chromatographic method. The reference substances were chosen according to estimated Koc range of the test substance and generalized calibration graph was prepared. The reference substances were Phenol, Aniline, Nitrobenzene, naphthalene, Phenanthrene and DDT were chosen having Koc value ranging from 1.32 to 5.63. The Log Koc value of test chemical was determined to be 3.679 dimensionless at 25°C. Based on the value of log Koc it is concluded that this test chemical has strong sorption to soil and sediments and therefore has slow migration potential to ground water.

 

Another experimental study was reviewed from Screening Assessment for the Challenge; September 2011 in this study the Log Koc values for test substance are based on calculations by Baughman and Perenich (1988) using a range of measured solubility for commercial dyes and an assumed melting point of 200 deg.C. During experiment the Log Koc (Organic carbon water partition coefficient) (dimensionless) was reported to be 3.4 to 4.2.

Based on the result it is concluded that the test chemical has low water solubility and a relatively high Koc it is not likely to leach from sediments and soils means test chemical is immobile in soil and sediment.

 

 By considering results of all the studies mentioned above it can be concluded that test chemical 2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-[2-[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-8-[2-[2-sulfo-4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]diazenyl]-, sodium salt (1:4) (CAS no. 607724-37-8) can be expected to have strong sorption to soil and sediments.