Registration Dossier
Registration Dossier
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EC number: 232-414-4 | CAS number: 8016-81-7 The residue from the distillation of tall oil. It contains primarily high-boiling esters of fatty acids and rosin. It may also contain neutral materials, free fatty acids and rosin acids.
Partition coefficient
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
The study does not need to be conducted because the partition coefficient of a UVCB substance of this nature should be evaluated on the basis of the properties of its constituents. A result for the whole substance is not meaningful scientifically for the purpose of assessment of exposure or risk. It is therefore not appropriate to conduct or propose a test for this endpoint. The needs associated with a sound understanding of partition coefficient are adequately met by the available data on constituents. Reliable partition coefficient data are characterised by quantitative structure activity relationships (QSARs) for constituents of the substance.
In other supporting study conducted according to OECD 117, the n-octanol/water partition coefficients of constituents of a sample of TOP have been determined; in unbuffered media, a range of log Kow values from 3.3 – 6.1 at pH 7. However, at pH 2 no constituents were detected, therefore log Kow at this pH could not be determined. In another study using the same method, three constituents were detected at both pH 2 and pH 7.5 with log Kow values of 4.3 – 6.9 at pH 2 and 2.8 – 4.4 at pH 7.5.
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