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Physical & Chemical properties

Vapour pressure

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From August 31, 2016 to September 06, 2016
Reliability:
1 (reliable without restriction)
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
GLP compliance:
not specified
Type of method:
dynamic method
Specific details on test material used for the study:
- Name of test material (as cited in study report): phosphoric acid, mono-and di-C6-C12-(even numbered)-alkyl esters potassium salts
Batch: RE 14-6
Appearance: White solid
Key result
Temp.:
20 °C
Vapour pressure:
<= 0.83 Pa
Key result
Temp.:
50 °C
Vapour pressure:
<= 19 Pa

The test substance had a vapour pressure of <= 8.2E-06 atm (<=8.3E-01 Pa; <=8.3E-03 mbar) at 20°C and of <= 1.9E-04 atm (<=1.9E+01 Pa; <=1.9E-01 mbar) at 50°C according to the definition in the OECD Guideline 104 (Grain-Watson estimation). The calculation was based on the lowest possible boiling temperature.

The experimentally determined vapour pressure of the test substance at 20°C was not in the recommended range of 1 to 1000 mbar for DSC-measurements. Therefore, an estimation procedure in accordance with the test method OECD Guideline 104 was used. This method is applied for vapour pressures between 10E03 and 10E-07 mbar.

Conclusions:
Under the study conditions, the vapour pressure of the test substance was determined to be ≤ 0.83 Pa at 20°C and ≤19 Pa at 50°C.
Executive summary:

A study was conducted to determine the vapour pressure of the test substance according to OECD Guideline 104 similar to EU method A.4 (differential scanning calorimetry (DSC)). The practical test performance was based on the in-house test procedure VTA(S) 31X07001.01: 'determination of the vapour pressure curve of solid and liquid substances by means of DSC'. The test substance had a vapour pressure of <= 8.2E-06 atm (<=8.3E-01 Pa; <=8.3E-03 mbar) at 20°C and of <= 1.9E-04 atm (<=1.9E+01 Pa; <=1.9E-01 mbar) at 50°C according to the definition in the OECD Guideline 104 (Grain-Watson estimation). The calculation was based on the lowest possible boiling temperature. The experimentally determined vapour pressure of the test substance at 20°C was not in the recommended range of 1 to 1000 mbar for DSC-measurements. Therefore, an estimation procedure in accordance with the test method OECD Guideline 104 was used. This method is applied for vapour pressures between 10E03 and 10E-07 mbar. Under the study conditions, the vapour pressure of the test substance was determined to be ≤ 0.83 Pa at 20°C and ≤ 19 Pa at 50°C (Kintrup, 2016).

Description of key information

The vapour pressure was determined according to OECD Guideline 104 and EU Method A.4 (Kintrup, 2016).

Key value for chemical safety assessment

Vapour pressure:
0.83 Pa
at the temperature of:
20 °C

Additional information