Fatty acids, linseed-oil, reaction products with bisphenol A-epichlorohydrin polymer and glycidyl neodecanoate

Partition coefficient

Link to relevant study record(s)

Reference

Endpoint:

partition coefficient

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 117 (Partition Coefficient (n-octanol / water), HPLC Method)

Deviations:

yes

Remarks:

The log Kow values for Fluoranthene and DDT were taken from the EU guideline A.8 instead of OECD 117, as the registration of the compound is for REACH. This deviation is stated as uncritical, as the difference is marginal only.

Qualifier:

according to guideline

Guideline:

EU Method A.8 (Partition Coefficient - HPLC Method)

GLP compliance:

not specified

Type of method:

HPLC method

Partition coefficient type:

octanol-water

Specific details on test material used for the study:

Batch no.: #210162718
Composition: Reaction products of linseed-oil fatty acids, 4,4'-methylendiphenyldiglycidylether with neodecanoic fatty acid, oxiranylmethylester
Purity: 100 % as per definition of UVCB

Analytical method:

high-performance liquid chromatography

Key result

Type:

log Pow

Partition coefficient:

> 6.2

Temp.:

25 °C

pH:

ca. 7

Details on results:

The test substance peaks showed retention times between 1.425 min and 37.647 min, with 99.8% of the peak areas eluting after the standard with highest logPow, DDT (the reference substance - log Pow = 6.20). The determination was precise with very low standard deviations of < 0.20 min. The calculation of the log Pow of the test substance peaks was not possible, because the peaks eluted outside the isocratic part of the HPLC program. Extrapolation was therefore not possible. Because the retention times of the test substance peaks were higher than the retention time of DDT (10.506 min), the log Pow of the test substance was stated as > 6.2 (log Pow of DDT).

Conclusions:

Under the study conditions, the partition coefficient (log Kow) of the test substance was determined to be > 6.2 (HPLC method).

Executive summary:

A study was conducted to determine the partition coefficient of the test substance according to OECD Guideline 117 and EU Method A.8 (HPLC method). One vial was filled with the reference substance (DDT) mix and one vial with the test substance solution. The vials were analysed using the HPLC. Three injections each were measured from the reference substance mix, the test substance solution and again from the reference substance mix. The data was saved, the retention times of the nine peaks of the reference substance mix and the retention times of the peaks of the test substance were used for further calculations. The test substance peaks showed retention times between 1.425 min and 37.647 min, with 99.8 % of the peak areas eluting after the standard with highest logKow, DDT (the reference substance - log Kow = 6.20). The determination was precise with very low standard deviations of < 0.20min. The calculation of the log Kow of the test substance peaks was not possible, because the peaks eluted outside the isocratic part of the HPLC program. Extrapolation was therefore not possible. Because the retention times of the test substance peaks were higher than the retention time of DDT (10.506 min), the log Kow of the test substance was stated as > 6.2 (i.e. log Kow of DDT), under the study conditions (2016).

Description of key information

The partition coefficient was determined according to OECD Guideline 117 and EU Method A.8 (HPLC method) (Johannes, 2016) as well as using KOWWIN v.1.68 of EPISuite v.4.1 (US EPA, 2016).

Key value for chemical safety assessment

Log Kow (Log Pow):

10

at the temperature of:

25 °C

Additional information

The log Kow of the test substance could not be determined from the experiment, as its peak eluted outside the isocratic part of the HPLC program; hence log Kow was concluded to be higher than the reference substance (i.e., >6.2). The estimated log Kow values for the major constituents using KOWWIN v.1.68 of EPISuite v.4.1 were found to be ≥10 (refer to Annex 3 for further details).