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
Among methods available to determine the organic carbon-normalized sorption coefficient (Koc), the screening study (OECD 121) is regarded as less suitable due to the surface active properties of the registered substance and due to the absence of relevant reference substances. The batch equilibrium method (OECD 106) is technically hampered as it is designed for pure substances and as it requires a sufficiently sensitive discriminative analytical method. Therefore, a calculation method is concluded to be the best option to estimate the Koc. The Koc of the solid content the registered substance has been calculated to be 0.659 l/kg at 25 degrees Celsius. The Koc of the registered substance can not be calculated.
Key value for chemical safety assessment
Additional information
Key value for chemical safety assessment
Koc of the solid content of the registered substance at 25°C: 0.659 L/kg
The HPLC estimation method (OECD 121) using soil-adsorption-reference data was performed with the registered substance, using 55/45 (v/v) methanol/water (neutral pH) and 55/45 (v/v) methanol/buffer solution pH 7 (pH 7) as eluens. The log Koc values at neutral pH and pH 7 were < 1.26 - 5.43 and < 1.26 - 4.97, respectively.
Among methods available to determine the organic carbon-normalized sorption coefficient (Koc), the screening study (OECD 121) is regarded as less suitable due to the surface active properties of the registered substance and due to the absence of relevant reference substances. The batch equilibrium method (OECD 106) is technically hampered as it is designed for pure substances and as it requires a sufficiently sensitive discriminative analytical method. Therefore, a calculation method is concluded to be the best option to estimate the Koc. The Koc of the solid content of the registered substance has been calculated with EUSES version 2.1.2, based on the logKow of the solid content of the registered substance, by using the in EUSES default QSAR for the chemical class non-hydrophobics: Koc = 10.47 x Kow^0.52.
As no method is available for the determination of the Pow of the registered substance, the Koc of the registered substance can not be calculated.
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