Administrative data

Link to relevant study record(s)

Reference

Endpoint:

partition coefficient

Type of information:

experimental study

Adequacy of study:

key study

Study period:

This study was conducted between 24 June 2016 and 18 December 2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

EC No. 440/2008 30 May 2008

Deviations:

no

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

13 April 2004

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

HPLC method

Partition coefficient type:

octanol-water

Analytical method:

high-performance liquid chromatography

Key result

Type:

Pow

Partition coefficient:

> 2 - < 3.22

Temp.:

20 °C

pH:

5 - 6

Key result

Type:

log Pow

Partition coefficient:

> 0.3 - < 0.507

Temp.:

20 °C

pH:

5 - 6

Details on results:

The predicted partition coefficient determined that a flask method was the most suitable method of analysis, however due to the fast hydrolysis of the test item this method was deemed not suitable and therefore HPLC was conducted. The HPLC method uses a range of standards and as such a limit value was employed on most of the peaks obtained as their retention time was lower than the lowest calibration standard. Limit value agreed with sponsor due to the fast hydrolysis of the test item.

The retention times of the dead time and the retention times, capacity factors (k') and log10 Pow values for the reference standards are shown in the following tables: Partition coefficient:       <2.00 to 3.22

Conclusions:

The partition coefficient of the test item has been determined to be in the range of less than 2.00 to 3.22, log10 Pow less than 0.3 (70.3% area) to 0.507 (29.7% area) at 20.0 ±0.5 °C.

Executive summary:

The general physico-chemical properties of 9-[2-(2-METHOXYETHOXY)ETHOXY]-9-[3(OXIRANYLMETHOXY)PROPYL]-2,5,8,10,13,16-HEXAOXA-9-SILAHEPTADECANE have been determined.   In the range of less than 2.00 to 3.22, log10 Pow <0.3 (70.3% area) to 0.507 (29.7% area) at 20.0 ± 0.5 °C, using the HPLC method, designed to be compatible with Method A.8 Partition Coefficient of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 117 of the OECD Guidelines for Testing of Chemicals, 13 April 2004.

Description of key information

Partition Coefficient (n-octanol/water)calculated to be in the range of less than 2.00 to 3.22, log10 Pow <0.3 (70.3% area) to 0.507 (29.7% area) at 20.0 ± 0.5 °C, using the HPLC method, designed to be compatible with Method A.8 Partition Coefficient of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 117 of the OECD Guidelines for Testing of Chemicals, 13 April 2004. For regulatory purposes the conservative estimate based on the minor peak should be used e.g. <0.507 at 20 ± 0.5 °C

Key value for chemical safety assessment

Log Kow (Log Pow):

0.507

at the temperature of:

20 °C

Additional information