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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From 2019-07-03 to 2019-07-06
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Study performed to current OECD guidelines with no significant deviations.
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
2006
Deviations:
no
GLP compliance:
no
Type of method:
effusion method: isothermal thermogravimetry
Specific details on test material used for the study:
Batch No.: A03-18-0081
Purity: ≥99.9%
Key result
Temp.:
25 °C
Vapour pressure:
4.58 Pa

The volatilization rate of reference substance benzoic acid was determined at different temperature of 55 °C, 60 °C, 65 °C, 70 °C, 75 °C, 80 °C. A plot of saturation vapour pressure logarithm of benzoic acid versus volatilization rate was linear to get the Antoine equation lnP=0.9196 ln(dm/dt)+1.3080, R=0.9974.

The volatilization rate of test item was determined at different temperature of 30 °C, 35 °C, 40 °C, 43 °C, 45 °Cand 50 °C. It was substituted into the Antoine equation to get the saturation vapour pressure of test item at corresponding absolute temperature. A plot of logarithm of saturation vapour pressure versus reciprocal value of absolute temperature was linear to get the Clapeyron equation lnP=-7280.3993 (1/T) + 25.9528, R=0.9974.

The saturation vapour pressure of test item at 25 °C was extrapolated by using the Clapeyron equation to be 4.58 Pa .

Conclusions:
The saturation vapor pressure of test item was 4.58 Pa at 25 °C.
Executive summary:

The saturation vapor pressure of the test item was determined by isothermal thermo gravimetric method according to OECD Guideline 104 (Vapour Pressure Curve).

The Clapeyron equation of test item was lnP=-7280.3993 (1/T) + 25.9528, R=0.9974. The saturation vapor pressure of test item was 4.58 Pa at 25 °C.

Description of key information

The saturation vapor pressure of test item was 4.58 Pa at 25 °C.

Key value for chemical safety assessment

Vapour pressure:
4.58 Pa
at the temperature of:
25 °C

Additional information

The saturation vapor pressure of the test item was determined by isothermal thermo gravimetric method according to OECD Guideline 104 (Vapour Pressure Curve).

The Clapeyron equation of test item was lnP=-7280.3993 (1/T) + 25.9528, R=0.9974. The saturation vapor pressure of test item was 4.58 Pa at 25 °C.