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Physical & Chemical properties

Partition coefficient

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Endpoint:
partition coefficient
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:
Endpoint:
partition coefficient
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The study was conducted according to OECD 117 test guideline, and in compliance with GLP.
Qualifier:
according to guideline
Guideline:
OECD Guideline 117 (Partition Coefficient (n-octanol / water), HPLC Method)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
HPLC method
Partition coefficient type:
octanol-water
Analytical method:
high-performance liquid chromatography
Type:
log Pow
Partition coefficient:
4.9 - 7.7
pH:
2
Type:
log Pow
Partition coefficient:
3.2 - 6.8
pH:
5 - 6
Conclusions:
A partition coefficient value of 4.9 - 7.7 at pH 2.0 and 3.2 - 6.8 at pH 5 - 6 for components of Tall Oil was determined in a reliable study conducted according to OECD 117, and in compliance with GLP.

Description of key 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.

Key value for chemical safety assessment

Additional information

In a supporting study conducted according to OECD 117, a partition coefficient of 4.9 - 7.7 and 3.2 - 6.8 at pH 2 and pH 5 - 6 was obtained for Distilled Tall Oil respectively.