Registration Dossier
Registration Dossier
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EC number: 695-988-9 | CAS number: 100556-82-9
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
The test substance does not tend to adsorb to sludge or soil
Key value for chemical safety assessment
- Koc at 20 °C:
- 17.8
Additional information
The adsorption/desorption characteristics of Reactive Black 5 in its bis-ester form were investigated in a GLP-compliant study performedaccording to the “HPLC- method” described in the European Commission Regulation (EC) No. 440/2008. In this study, all solutions were analysed with HPLC with UV-VIS detector, reversed phase column (LiChrospher 100 CN column) and an aqueous mobile phase (methanol/water solution (55/45 v/v)). The log k’ values of reference substances were plotted against their known log Koc values. The log Koc value for the test substance was calculated by substituting its mean log k’ in the calibration curve. Under the conditions of the test, the log Koc of the test substance was determined at ≤1.25 (equivalent Koc ≤ 18 L/kg) which indicates that the test substance is very mobile.
Using QSAR calculations correlating the Koc with water solubility or n-octanol/water partition coefficient, the average adsorption coefficient of Reactive Black 5 bis-vinyl was estimated to be Koc = 11, confirming the very high mobility of the test item.
[LogKoc: 1.25]
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