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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Adsorption / desorption

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Description of key information


Key value for chemical safety assessment

Additional information

According to Annex VII, Column 2 of the REACH Regulation (EC 1907/2006), the study does not need to be conducted if, based on the physicochemical properties, the substance can be expected to have a low potential for adsorption (e.g. the substance has a low octanol water partition coefficient).

The target substance has a low logPow, i.e. -2.2671 at pH 3.34 and 20 °C, indicating a low potential for adsorption.

The low adsorption potential was confirmed by predictions carried out byEuses 2.1.2 and KOCWIN v2.00 as implemented by EPI Suite v4.11.

The first approach uses experimental water solubility and logPow of -1, approximated to the maximum acceptable values for the model, i.e. 100 mg/l and -1. Predicted Koc was 3.16 l/kg.

The second approach uses smile notation as input c12c(cc(S(=O)(=O)[O-])cc2S(=O)(=O)[O-])ccc(c1\N=N\c1c2c(c(S(=O)(=O)[O-])cc1)cccc2)O and the experimental logPow of ca. -2.27 at 20 °C. Predicted Koc and logKoc were 1.858 l/kg and 0.269 l/kg, respectively.

Such values are indicative of a low adsorption potential. As reported in Chapter R.7b: in general substances with a Koc <500 – 1000 l/kg are not likely sorbed to sediment (SETAC 1993). According to this, a log Koc or log Kow of ≥3 is used as a trigger value for sediment effects assessment.