Registration Dossier
Registration Dossier
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EC number: 204-889-8 | CAS number: 128-49-4
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
The Koc value was calculated using EPIWIN 4.0. The resulting log Koc value of 5.23 L/kg indicates that the substance may strongly adsorb to soils or sediments should these environmental compartments be exposed to it.
However, the substance fails to account for the fact that docusate calcium will be ionised under environmentally relevant pH levels so the model may be overestimating the potential sorption of the substance to soils and sediment.
Key value for chemical safety assessment
- Koc at 20 °C:
- 170 000
Additional information
The QSAR tool EPIWIN 4.0 was applied to calculate the Koc of the substance, based on its Log Kow (EPIWIN 4.0). The resulting log Koc estimate of 5.23 L/kg (Koc = 1.7E05) indicates that the substance would strongly adsorb to soils or sediments according to FAO mobility classification. However, the substance fails to account for the fact that docusate calcium will be ionised under environmentally relevant pH levels so the model may be overestimating the potential sorption of the substance to soils and sediment.
It should be mentioned that, in accordance with EC 1907/2006, Annex VIII, point 9.3.1, column 2, assessment of the adsorption/desorption behaviour of the substance is not required due to its ready biodegradability and its low octanol-water partition coefficient, indicating that it has not a high potential to adsorb to soils/sediments. Hence, environmental hazard assessment is not being done. Although determination of Kd/Koc is not required, Koc is needed for derivation of PNECs sediment and soil and was hence calculated for that purpose and provided herewith.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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