Registration Dossier
Registration Dossier
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EC number: - | CAS number: -
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
A number of physical-chemical properties of the pure substance, which is a solid powder of medium dustiness, are given here because they are needed in the modelling of environmental concentrations. The substance’s water solubility is very high (>176 g/L at 20 °C) and its vapour pressure (2 x 10-22 Pa at 25 °C) and octanol-water partitioning coefficient (log KOW is -2 at 20 °C) are very low. Though the dye has a low KOW, the substance exhibits a significant sorption capacity and this was reflected by choosing a KOC value of 1,000,000 L/kg.
This KOC value has been used to derivate the PNECs applying the Partitioning Method.
Key value for chemical safety assessment
- Koc at 20 °C:
- 1 000 000
Additional information
The HPLC method for Koc estimation is a guideline-conform study under GLP. However, the protocol as given by OECD Guideline 121 states "If the actual results show that the log Koc of the test substance is outside the calibration range the test should be repeated using different, more appropriate reference substances". As during this study the retention time of the test item was outside the retention times of the calibration substances (i.e. outside log Koc range 1.5 to 5.0), and the test still was not repeated, this has to be considered as some relvant deviation from the study protocol. Still, as stated in the study report, the chromatography of the test item resulted in one main peaks with well-defined and reproducible retention times, the HPLC method was therefore considered to be suitable for the purpose of the study. Furthermore in the study report QSPR computations of the estimated Koc of the test item are given, and these computed values are in alignment with the HPLC data.
Based on a weight of evidence approach the study result from the HPLC method Koc < 18 therefore can be condsidered as acceptable. The result from the HPLC method is Koc < 18, which basically was being confirmed by the result from the QSPR computation Koc = 1.2. Based on the mobility classification system of McCall (1981) the substance falls within the bracket Koc 0 - 50, and therefore is to be considered as of very high mobility.
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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