Registration Dossier
Registration Dossier
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EC number: 700-615-0 | CAS number: -
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Justification of the non feasability of the experimental assessment and rational of the calculation of the Log Koc.
Key value for chemical safety assessment
- Koc at 20 °C:
- 489 000
Additional information
Experimental assessment of the adsorption coefficient on soils and sludges was not feasible for this test item by either the HPLC estimation method, as detailed in Method C19 Adsorption Coefficient of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 121 of the OECD Guidelines for Testing of Chemicals, 22 January 2001, or the batch equilibrium method, as detailed in Method C18 Adsorption Coefficient of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 106 of the OECD Guidelines for Testing of Chemicals, 21 January 2000. Furthermore, the complex composition of the test item and its chemical class of a salt prevented the use of alternative estimation methods such as the predictive software KOCWIN, version 2.00, © 2000 US EPA, or the use of Quantitative Structure Activity Relationships (QSAR’s).
However, given the extremely low water solubility and high partition coefficient characteristics supplied by the Sponsor; it would be expected that the test item would adsorb rapidly to soil or sludge, showing little or no mobility, and therefore no presence in the aquatic compartment of the environment.
As the experimental assessment was not feasible, the Koc value for the Sepisol Fast Violet 3B is calculted based on the Log Kow of 6.9, using the equation from the EU-TGD (predominantly hydrophobics) as implemented in ESIS 2.1.1 and giving a value of 489 000 L/kg.
[LogKoc: 5.6893]
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