Phosphoric acid, mono and bis-linear butyl esters, potassium salts

Vapour pressure

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

weight of evidence

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 104 (Vapour Pressure Curve)

GLP compliance:

not specified

Type of method:

dynamic method

Test no.:

#1

Temp.:

20 °C

Vapour pressure:

<= 4.1 hPa

Conclusions:

The estimated vapour pressure is <= 4.1 hPa at 20 °C.

Executive summary:

The vapour pressure of the test item was determined in accordance with OECD TG 104. An experimental measurement of the vapour pressure by DSC was not practicable. Estimation using the Grain-Watson method was performed using the lowest possible boiling temperature. The estimated vapour pressure is <= 4.1 hPa at 20 °C.

Reference 2

Endpoint:

vapour pressure

Type of information:

(Q)SAR

Adequacy of study:

weight of evidence

Study period:

2018-04-26

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

accepted calculation method

Principles of method if other than guideline:

- Software tool(s) used including version: Estimation Programs Interface Suite™ for Microsoft® Windows v 4.00. US EPA, United States Environmental Protection Agency, Washington, DC, USA.
- Model(s) used: MPBPVP (v1.43)
- Model description: see field 'Justification for non-standard information', 'Attached justification' and/or 'Cross-reference'
- Justification of QSAR prediction: see field 'Justification for type of information', 'Attached justification' and/or 'Cross-reference'

GLP compliance:

no

Type of method:

other: Estimation

Test no.:

#1

Temp.:

25 °C

Vapour pressure:

0 Pa

Remarks on result:

other: dipotassium butylphosphate

Test no.:

#2

Temp.:

25 °C

Vapour pressure:

0 Pa

Remarks on result:

other: potassium dibutylphosphate

Conclusions:

Estimated vapour pressure = 8.9 E-7 Pa at 25 °C (dipotassium butyl phosphate).
Estimated vapour pressure = 7.19 E-7 Pa at 25 °C (potassium dibutyl phosphate).

Executive summary:

The vapour pressure of the two main constituents was estimated using MPBPVP v 1.43. The estimated vapour pressures were 8.9 E-7 Pa at 25 °C (dipotassium butyl phosphate) and 7.19 E-7 Pa at 25 °C (potassium dibutyl phosphate).

Description of key information

Estimated vapour pressure = 8.9 E-7 Pa at 25 °C (dipotassium butyl phosphate).

Estimated vapour pressure = 7.19 E-7 Pa at 25 °C (potassium dibutyl phosphate).

Key value for chemical safety assessment

Vapour pressure:

0 Pa

at the temperature of:

25 °C

Additional information

The vapour pressure of the test item was determined in accordance with OECD TG 104. An experimental measurement of the vapour pressure by DSC was not practicable. Estimation using the Grain-Watson method was performed using the lowest possible boiling temperature. The estimated vapour pressure is <= 4.1 hPa at 20 °C. Although this estimation is reliable, the boiling point upon which it is based does not seem to be consistent with the reported melting point. For this reason the vapour pressure of the two main constituents was estimated using MPBPVP v 1.43. The estimated vapour pressures were 8.9 E-7 Pa at 25 °C (dipotassium butyl phosphate) and 7.19 E-7 Pa at 25 °C (potassium dibutyl phosphate).