9-Octadecenoic acid (Z)-, sulfonated, potassium salts

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

calculation (if not (Q)SAR)

Adequacy of study:

key study

Study period:

From April 23, 2013 to May 23, 2013

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

Deviations:

no

Qualifier:

equivalent or similar to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Deviations:

no

Principles of method if other than guideline:

The experimentally determined vapour pressure of the test susbtance at 20 °C of 1.8E-10 mBar is not in the recommended range of 1 to 1,000 mBar for Differential Scanning Calorimetry (DSC)-measurements. Therefore an estimation procedure in accordance with the test method OECD Guideline 104 "OECD Guideline for the testing of chemicals, adopted by the council on 23 March 2006, Vapour Pressure " ANNEX Estimation method newest version was used. This method is applied for vapour pressures between E3 to E-7 mBar. This deviates from the older version published in OECD Guideline 104. It was used due to the differentiation between solids and liquids, which results in a more precise estimate. The calculation is based on the theoretical, instead of the experimentally determined, vapour pressure.

GLP compliance:

not specified

Type of method:

other: Estimation method (i.e., Grain-Watson estimation)

Key result

Temp.:

20 °C

Vapour pressure:

<= 0 atm

Remarks on result:

other: The calculation is based on the lowest possible boiling temperature.

Conclusions:

Under the study conditions, the vapour pressure of the test substance was calculated to be <2.1E-10 atm (i.e., 2.1E-5 Pa; 2.1E-7 mBar) at 20 °C (the calculation is based on the lowest possible boiling temperature).

Executive summary:

A study was conducted to determine the vapour pressure of the test substance according to OECD Guideline 104 and similar to EU Method A.4. The vapour pressure was determined by the dynamic method carried out by means of differential scanning calorimetry (i.e., DSC). However, the experimentally determined vapour pressure of the test susbtance at 20 °C of 1.8E-10 mBar is not in the recommended range of 1 to 1,000 mBar for DSC measurements. Therefore, an estimation method (i.e., Grain-Watson estimation) in accordance with the OECD Guideline 104 was used to calculate the vapour pressure of test substance. Under the study conditions, the vapour pressure of the test substance was calculated to be <2.1E-10 atm (i.e., 2.1E-5 Pa; 2.1E-7 mBar) at 20 °C (the calculation is based on the lowest possible boiling temperature) (Kintrup, 2013).

Description of key information

The vapour pressure was determined according to OECD Guideline 104 and EU Method A.4 (Kintrup, 2013).

Key value for chemical safety assessment

Vapour pressure:

0 Pa

at the temperature of:

20 °C